The Experts below are selected from a list of 8988 Experts worldwide ranked by ideXlab platform
Peng Zhou - One of the best experts on this subject based on the ideXlab platform.
-
A Thermodynamic Description of the U−Ti−Zr system
Calphad, 2018Co-Authors: Yinping Zeng, Peng Zhou, Bin Bai, Xiaolin Wang, Jingrui ZhaoAbstract:Abstract The U−Ti−Zr system was assessed by means of the CALPHAD method for the first time. Based on a critical evaluation of experimental phase diagram data available in the literature, a Thermodynamic modeling was conducted for the individual phases. The solution phases including the liquid, hcp and bcc were described by a substitutional solution model. The binary compounds, U 2 Ti and UZr 2 , with a ternary extension were treated as one single phase using a sublattice model of (U,Zr) 2/3 (Ti,Zr) 1/3 . There is no ternary compound in this system. A set of self-consistent Thermodynamic parameters for the U−Ti−Zr system was then obtained. Comparisons between the calculated and measured phase diagrams show that the experimental information is satisfactorily accounted for by the present Thermodynamic Description. The solvus projection and reaction scheme were generated using the present Thermodynamic parameters. The presently calculated phase diagrams of U–Zr−Ti alloys can be used for further industrial application.
-
Thermodynamic Description and quaternary miscibility gap of the c hf ti w system
Journal of Alloys and Compounds, 2017Co-Authors: Yong Du, Peng Zhou, Yingbiao PengAbstract:The C–Hf–Ti, C–Hf–W and C–Hf–Ti–W systems have been assessed by means of the CALPHAD (CALculation of PHAse Diagram) approach. All of the experimental phase diagram and Thermodynamic data available from the literature are critically reviewed. According to the available experimental data, no ternary or quaternary compound has been found in these systems. The liquid is modeled as a substitutional solution phase, while the solid solution phases including βHf, αHf, βTi, αTi, W, HfC1-x, TiC1-x, WC1-x, WC, W2C and HfW2 are described by sublattice models. The modeling of C–Hf–Ti and C–Hf–W systems covers the whole composition range. A set of self-consistent Thermodynamic parameters for the C–Hf–Ti and C–Hf–W systems are then obtained. Comprehensive comparisons between the calculated and experimental data show that the experimental information is satisfactorily accounted for by the present Thermodynamic Description. The liquidus projection and reaction scheme of the C–Hf–Ti and C–Hf–W systems are generated by using the present Thermodynamic parameters. Due to limited experimental data, the simple Hf–Ti–W system is extrapolated from its sub-binary systems. Based on the present work and the previous assessment of the C–Ti–W system, a Thermodynamic Description of the quaternary C–Hf–Ti–W system is extrapolated, and the experimental phase equilibria can also be well reproduced by the present Thermodynamic modeling. For the first time, the miscibility gap of the quaternary cubic carbides is calculated in the quaternary C–Hf–Ti–W system. A high potential in industrial applications such as in bulk cemented carbide, cermet cutting tools and hard-coatings is discussed mainly in terms of the miscibility gap.
-
a Thermodynamic Description of the al co ni system and site occupancy in co alni3 composite binder phase
Journal of Alloys and Compounds, 2016Co-Authors: Yaru Wang, Jianzhan Long, Yingbiao Peng, Peng Zhou, Yong Du, Bo Sundman, Tao Xu, Zhongjian ZhangAbstract:Abstract Phase equilibria of the Al–Co–Ni system is extremely useful for understanding phase behavior of AlNi3-based L12 phases, regarding its attractive properties, such as high-temperature oxidation resistance and corrosion resistance, high hardness and strength. In the present work, all the experimental data about the phase equilibria and Thermodynamic properties of the Al–Co–Ni system were critically evaluated, and a Thermodynamic Description for this system over the whole composition and temperature ranges was obtained. Most importantly, the ordered/disordered transition between fcc_A1 and L12 phases was described using a four-sublattice (4SL) model. Based on the crystallographic and experimental data, three stable ternary intermetallic phases were described using sublattice model. Two of them were treated as semi-stoichiometric compounds with homogeneity ranges for Co and Ni, and the other one was treated as a stoichiometric compound. The other phases were described by using substitutional solution model. The present work provides a more complete and accurate Thermodynamic Description compared with previous ones. A reasonable agreement was obtained between calculations and experimental data in the ternary system. The occupancy behavior of Co in AlNi3 is Thermodynamically predicted, and the computed occupancy shows a much better fit to the experimental data than previous first-principles calculations. In addition, the composition range of the Co + AlNi3 two-phase region, concerning a new type of composite binder for cemented carbides, was found to shift to the Co-rich side with the decrease of the temperature.
-
A Thermodynamic Description of the Al–Co–Ni system and site occupancy in Co + AlNi3 composite binder phase
Journal of Alloys and Compounds, 2016Co-Authors: Yaru Wang, Jianzhan Long, Yingbiao Peng, Peng Zhou, Bo Sundman, Zhongjian ZhangAbstract:Abstract Phase equilibria of the Al–Co–Ni system is extremely useful for understanding phase behavior of AlNi3-based L12 phases, regarding its attractive properties, such as high-temperature oxidation resistance and corrosion resistance, high hardness and strength. In the present work, all the experimental data about the phase equilibria and Thermodynamic properties of the Al–Co–Ni system were critically evaluated, and a Thermodynamic Description for this system over the whole composition and temperature ranges was obtained. Most importantly, the ordered/disordered transition between fcc_A1 and L12 phases was described using a four-sublattice (4SL) model. Based on the crystallographic and experimental data, three stable ternary intermetallic phases were described using sublattice model. Two of them were treated as semi-stoichiometric compounds with homogeneity ranges for Co and Ni, and the other one was treated as a stoichiometric compound. The other phases were described by using substitutional solution model. The present work provides a more complete and accurate Thermodynamic Description compared with previous ones. A reasonable agreement was obtained between calculations and experimental data in the ternary system. The occupancy behavior of Co in AlNi3 is Thermodynamically predicted, and the computed occupancy shows a much better fit to the experimental data than previous first-principles calculations. In addition, the composition range of the Co + AlNi3 two-phase region, concerning a new type of composite binder for cemented carbides, was found to shift to the Co-rich side with the decrease of the temperature.
-
A Thermodynamic Description of the C–Hf–Ta system over the whole composition and temperature ranges
Calphad, 2016Co-Authors: Yafei Pan, Yingbiao Peng, Peng Zhou, Fenghua LuoAbstract:Abstract The phase equilibria and Thermodynamic properties of the Al–Ge–Ni system are useful for understanding the diffusion process during the transient liquid phase (TLP) bonding. In this work, the Thermodynamic Description of the Al–Ge–Ni system over the whole composition and temperature ranges was performed by means of the CALPHAD (CALculation of PHAse Diagrams) method. The enthalpies of mixing of the liquid phase, three isothermal sections at 973, 823, and 673 K and nine vertical sections at 10, 20, 35, 55, 60, 70, 75, and 80 at% Ni and at a constant Al:Ni ratio of 1:3 were taken into account in the present optimization work. A set of self-consistent Thermodynamic parameters of the Al–Ge–Ni system was first obtained. The liquidus projection and reaction scheme were constructed according to the Thermodynamic parameters obtained in this work. The phase equilibria and Thermodynamic properties calculated by the present Thermodynamic Description show satisfactory agreement with the available experimental information.
Keke Chang - One of the best experts on this subject based on the ideXlab platform.
-
Thermodynamic Description of the dy si c system in silicon carbide ceramics
Calphad-computer Coupling of Phase Diagrams and Thermochemistry, 2020Co-Authors: Leilei Chen, Keke Chang, Zixuan Deng, Peng Wan, Feng Huang, Qing HuangAbstract:Abstract To predict the thermal behaviors of Dy3Si2C2 during sintering or joining process of the silicon carbide (SiC) ceramics, we established a detailed Thermodynamic Description of Dy–Si–C by coupling the first-principles calculations and the CALPHAD (CALculation of PHAse Diagram) approach. First-principles calculations were applied to acquire the formation enthalpies of key compounds, which can perform as end-members during optimization. We proposed a first Dy–C binary phase diagram referred to other RE-C (RE = La, Ce and Pr) systems. The Dy–Si system, previously described with the modified quasichemical model (MQM), was modeled based on the random-mixing Bragg Williams model in this work. The presently obtained Thermodynamic parameters can reasonably reproduce the available experimental data and elucidate the thermal behaviors of Dy3Si2C2. We calculated that Dy3Si2C2 reacted with SiC via ternary eutectic reaction at 1432 °C, which was consistent with the reported experimental results. Further work of other SiC-based systems may provide foresight to explore new sintering aids in ceramics.
-
Thermodynamic Description of the sintering aid system in silicon carbide ceramics with the addition of yttrium
Journal of The European Ceramic Society, 2019Co-Authors: Kai Xu, Keke Chang, Leilei Chen, Yeyan Huang, Zixuan Deng, Feng Huang, Xiaobing Zhou, Qing HuangAbstract:Abstract The Y 3 Si 2 C 2 coating on the surface of the silicon carbide powders can play as an important additive to improve the sintering process of silicon carbide ceramics. A detailed Thermodynamic Description for the Y-Si-C system is desired to study the sintering and densification mechanisms. Coupling the first-principles calculations and CALPHAD approach, we have Thermodynamically investigated the Y-Si-C with its binary sub-systems. The presently obtained Thermodynamic parameters can reasonably reproduce the available experimental data. With the theoretical analysis, we have successfully elaborated the thermal behaviors of the Y 3 Si 2 C 2 coating during the sintering process. Similar work on other SiC based systems may provide a solid Thermodynamic basis for the development of other sintering aids in ceramics.
-
Thermodynamic Description of the Fe–Cu–C system
Calphad, 2019Co-Authors: Leilei Chen, Zhenyu Zhang, Yeyan Huang, Cui Junfeng, Zixuan Deng, Houke Zou, Keke ChangAbstract:Abstract As an addition to the iron-carbon alloys to improve their strength and corrosion resistance, copper is of great importance for iron and steel industry and the Fe–Cu–C system has been extensively investigated. Aiming at a Thermodynamic basis to investigate the effect of Cu addition on the Fe–C system, the CALPHAD (CALculation of PHAse Diagrams) approach was utilized to assess the ternary Fe–Cu–C system including the binary Cu–C and Fe–C systems. The Redlich-Kister model, instead of the Modified Quasichemical Model (MQM) in previous work, was used to model the liquid phase. The parameters of the liquid phase in the Fe–C system from previous work have been slightly modified to fit better with new experimental data at high temperatures. One Fe/Cu/FeC0.05 (in wt%) diffusion couple was designed to further determine the phase equilibria of the ternary system. A set of self-consistent parameters for the Fe–Cu–C system was obtained after Thermodynamic optimization. Good correspondence between calculated and experimental values of phase diagrams, Thermodynamic properties, and liquidus projections has been achieved by the present Thermodynamic Description.
-
Thermodynamic Description of the layered o3 and o2 structural licoo2 coo2 pseudo binary systems
Calphad-computer Coupling of Phase Diagrams and Thermochemistry, 2013Co-Authors: Keke Chang, Bengt Hallstedt, Denis Music, Julian Fischer, Carlos Ziebert, Sven Ulrich, H J SeifertAbstract:Abstract In the present work, we have studied the layered O3 and O2 structural LiCoO2–CoO2 pseudo-binary systems using the CALPHAD approach. In the O3 structural LiCoO2–CoO2 system, the O3-LiCoO2 phase is modeled based on the available Thermodynamic information, especially the heat capacity data. The parameters of other phases, i.e. O3′ (ordered O3), H1-3 and O1, are accordingly adjusted based on the experimental and ab initio data. The whole system is then reassessed. In the O2 structural LiCoO2–CoO2 system, the O2-LiCoO2 phase is modeled based on the enthalpy difference from the O3-LiCoO2 phase. Other phases, i.e. O2′ (ordered O2), T#2, T#2′ (ordered T#2) and O6, are correspondingly described using appropriate sublattice models. The parameters for each phase are adjusted considering both the experimental and ab initio data. The Thermodynamic calculations agree well with literature. Measured Li/LiCoO2 cell voltages were used to support the modeling and are well reproduced by the Thermodynamic Description.
-
A Thermodynamic Description of the C–Ta–Zr system
International Journal of Refractory Metals and Hard Materials, 2013Co-Authors: Peng Zhou, Yingbiao Peng, Shequan Wang, Guanghua Wen, Wen Xie, Keke ChangAbstract:Abstract Based on critical evaluation of the literature data, the C–Ta–Zr ternary system has been reviewed and assessed by means of the CALPHAD technique. There is no ternary compound in this system. The individual solution phases, i.e., liquid, fcc, hcp and bcc, have been modeled. The modeling covers the whole compositional range of this system and the temperature range from 200 to 3600 °C. A self-consistent Thermodynamic Description for the C–Ta–Zr system has been developed. Comprehensive comparisons between the present calculations and measured phase diagrams in the literature show that the reliable experimental information is satisfactorily accounted for by the present Thermodynamic Description. The liquidus projection and reaction scheme of the C–Ta–Zr system have been presented.
Yingbiao Peng - One of the best experts on this subject based on the ideXlab platform.
-
Thermodynamic Description and quaternary miscibility gap of the c hf ti w system
Journal of Alloys and Compounds, 2017Co-Authors: Yong Du, Peng Zhou, Yingbiao PengAbstract:The C–Hf–Ti, C–Hf–W and C–Hf–Ti–W systems have been assessed by means of the CALPHAD (CALculation of PHAse Diagram) approach. All of the experimental phase diagram and Thermodynamic data available from the literature are critically reviewed. According to the available experimental data, no ternary or quaternary compound has been found in these systems. The liquid is modeled as a substitutional solution phase, while the solid solution phases including βHf, αHf, βTi, αTi, W, HfC1-x, TiC1-x, WC1-x, WC, W2C and HfW2 are described by sublattice models. The modeling of C–Hf–Ti and C–Hf–W systems covers the whole composition range. A set of self-consistent Thermodynamic parameters for the C–Hf–Ti and C–Hf–W systems are then obtained. Comprehensive comparisons between the calculated and experimental data show that the experimental information is satisfactorily accounted for by the present Thermodynamic Description. The liquidus projection and reaction scheme of the C–Hf–Ti and C–Hf–W systems are generated by using the present Thermodynamic parameters. Due to limited experimental data, the simple Hf–Ti–W system is extrapolated from its sub-binary systems. Based on the present work and the previous assessment of the C–Ti–W system, a Thermodynamic Description of the quaternary C–Hf–Ti–W system is extrapolated, and the experimental phase equilibria can also be well reproduced by the present Thermodynamic modeling. For the first time, the miscibility gap of the quaternary cubic carbides is calculated in the quaternary C–Hf–Ti–W system. A high potential in industrial applications such as in bulk cemented carbide, cermet cutting tools and hard-coatings is discussed mainly in terms of the miscibility gap.
-
a Thermodynamic Description of the al co ni system and site occupancy in co alni3 composite binder phase
Journal of Alloys and Compounds, 2016Co-Authors: Yaru Wang, Jianzhan Long, Yingbiao Peng, Peng Zhou, Yong Du, Bo Sundman, Tao Xu, Zhongjian ZhangAbstract:Abstract Phase equilibria of the Al–Co–Ni system is extremely useful for understanding phase behavior of AlNi3-based L12 phases, regarding its attractive properties, such as high-temperature oxidation resistance and corrosion resistance, high hardness and strength. In the present work, all the experimental data about the phase equilibria and Thermodynamic properties of the Al–Co–Ni system were critically evaluated, and a Thermodynamic Description for this system over the whole composition and temperature ranges was obtained. Most importantly, the ordered/disordered transition between fcc_A1 and L12 phases was described using a four-sublattice (4SL) model. Based on the crystallographic and experimental data, three stable ternary intermetallic phases were described using sublattice model. Two of them were treated as semi-stoichiometric compounds with homogeneity ranges for Co and Ni, and the other one was treated as a stoichiometric compound. The other phases were described by using substitutional solution model. The present work provides a more complete and accurate Thermodynamic Description compared with previous ones. A reasonable agreement was obtained between calculations and experimental data in the ternary system. The occupancy behavior of Co in AlNi3 is Thermodynamically predicted, and the computed occupancy shows a much better fit to the experimental data than previous first-principles calculations. In addition, the composition range of the Co + AlNi3 two-phase region, concerning a new type of composite binder for cemented carbides, was found to shift to the Co-rich side with the decrease of the temperature.
-
A Thermodynamic Description of the Al–Co–Ni system and site occupancy in Co + AlNi3 composite binder phase
Journal of Alloys and Compounds, 2016Co-Authors: Yaru Wang, Jianzhan Long, Yingbiao Peng, Peng Zhou, Bo Sundman, Zhongjian ZhangAbstract:Abstract Phase equilibria of the Al–Co–Ni system is extremely useful for understanding phase behavior of AlNi3-based L12 phases, regarding its attractive properties, such as high-temperature oxidation resistance and corrosion resistance, high hardness and strength. In the present work, all the experimental data about the phase equilibria and Thermodynamic properties of the Al–Co–Ni system were critically evaluated, and a Thermodynamic Description for this system over the whole composition and temperature ranges was obtained. Most importantly, the ordered/disordered transition between fcc_A1 and L12 phases was described using a four-sublattice (4SL) model. Based on the crystallographic and experimental data, three stable ternary intermetallic phases were described using sublattice model. Two of them were treated as semi-stoichiometric compounds with homogeneity ranges for Co and Ni, and the other one was treated as a stoichiometric compound. The other phases were described by using substitutional solution model. The present work provides a more complete and accurate Thermodynamic Description compared with previous ones. A reasonable agreement was obtained between calculations and experimental data in the ternary system. The occupancy behavior of Co in AlNi3 is Thermodynamically predicted, and the computed occupancy shows a much better fit to the experimental data than previous first-principles calculations. In addition, the composition range of the Co + AlNi3 two-phase region, concerning a new type of composite binder for cemented carbides, was found to shift to the Co-rich side with the decrease of the temperature.
-
A Thermodynamic Description of the C–Hf–Ta system over the whole composition and temperature ranges
Calphad, 2016Co-Authors: Yafei Pan, Yingbiao Peng, Peng Zhou, Fenghua LuoAbstract:Abstract The phase equilibria and Thermodynamic properties of the Al–Ge–Ni system are useful for understanding the diffusion process during the transient liquid phase (TLP) bonding. In this work, the Thermodynamic Description of the Al–Ge–Ni system over the whole composition and temperature ranges was performed by means of the CALPHAD (CALculation of PHAse Diagrams) method. The enthalpies of mixing of the liquid phase, three isothermal sections at 973, 823, and 673 K and nine vertical sections at 10, 20, 35, 55, 60, 70, 75, and 80 at% Ni and at a constant Al:Ni ratio of 1:3 were taken into account in the present optimization work. A set of self-consistent Thermodynamic parameters of the Al–Ge–Ni system was first obtained. The liquidus projection and reaction scheme were constructed according to the Thermodynamic parameters obtained in this work. The phase equilibria and Thermodynamic properties calculated by the present Thermodynamic Description show satisfactory agreement with the available experimental information.
-
A Thermodynamic Description of the C–Ta–Zr system
International Journal of Refractory Metals and Hard Materials, 2013Co-Authors: Peng Zhou, Yingbiao Peng, Shequan Wang, Guanghua Wen, Wen Xie, Keke ChangAbstract:Abstract Based on critical evaluation of the literature data, the C–Ta–Zr ternary system has been reviewed and assessed by means of the CALPHAD technique. There is no ternary compound in this system. The individual solution phases, i.e., liquid, fcc, hcp and bcc, have been modeled. The modeling covers the whole compositional range of this system and the temperature range from 200 to 3600 °C. A self-consistent Thermodynamic Description for the C–Ta–Zr system has been developed. Comprehensive comparisons between the present calculations and measured phase diagrams in the literature show that the reliable experimental information is satisfactorily accounted for by the present Thermodynamic Description. The liquidus projection and reaction scheme of the C–Ta–Zr system have been presented.
V.t. Witusiewicz - One of the best experts on this subject based on the ideXlab platform.
-
Thermodynamic Description of the al c ti system
Journal of Alloys and Compounds, 2015Co-Authors: V.t. Witusiewicz, Bengt Hallstedt, A. A. Bondar, Ulrike Hecht, S. V. Sleptsov, Ya T VelikanovaAbstract:Abstract Based on novel experimental data the Thermodynamic Description of the ternary Al–C–Ti system was subject to optimization using the CALPHAD approach (Thermo-Calc/PARROT). The reaction scheme, the projections of the liquidus and solidus surfaces, as well as a number of isothermal sections and isopleths were calculated using the proposed Thermodynamic Description and compared with the experimental results. The calculations were shown to adequately reproduce the experimental data. The main feature of the phase equilibria in the system is the existence of three ternary compounds P (Ti3AlC), H (Ti2AlC) and N (Ti3AlC2) forming peritectically from the liquid phase and TiC1−x carbide at 1907, 1865 and 2013 K, respectively. It is shown that these three compounds are Thermodynamically stable in a wide temperature interval.
-
Thermodynamic Description of the Al–C–Ti system
Journal of Alloys and Compounds, 2015Co-Authors: V.t. Witusiewicz, Bengt Hallstedt, A. A. Bondar, Ulrike Hecht, S. V. Sleptsov, T.ya. VelikanovaAbstract:Abstract Based on novel experimental data the Thermodynamic Description of the ternary Al–C–Ti system was subject to optimization using the CALPHAD approach (Thermo-Calc/PARROT). The reaction scheme, the projections of the liquidus and solidus surfaces, as well as a number of isothermal sections and isopleths were calculated using the proposed Thermodynamic Description and compared with the experimental results. The calculations were shown to adequately reproduce the experimental data. The main feature of the phase equilibria in the system is the existence of three ternary compounds P (Ti3AlC), H (Ti2AlC) and N (Ti3AlC2) forming peritectically from the liquid phase and TiC1−x carbide at 1907, 1865 and 2013 K, respectively. It is shown that these three compounds are Thermodynamically stable in a wide temperature interval.
-
the al b nb ti system v Thermodynamic Description of the ternary system al b ti
Journal of Alloys and Compounds, 2009Co-Authors: V.t. Witusiewicz, A. A. Bondar, Ulrike Hecht, J. Zollinger, L. V. Artyukh, Ya T VelikanovaAbstract:Abstract The Thermodynamic Description of the ternary system Al–B–Ti is obtained by modelling the Gibbs energy of all individual phases in the system using the CALPHAD approach. The model parameters have been evaluated using the computer optimization technique PARROT based on the available Descriptions of the constituent binary systems Al–B, B–Ti and Al–Ti recently published and relevant experimental information on phase equilibria for the ternary system. For the ternary system Al–B–Ti the reaction scheme, projection of the liquidus, solidus and solvus surfaces, selected vertical and isothermal sections are calculated using the proposed Thermodynamic Description. An acceptable agreement between the calculations and experimental data is achieved.
-
The Al–B–Nb–Ti system: V. Thermodynamic Description of the ternary system Al–B–Ti
Journal of Alloys and Compounds, 2008Co-Authors: V.t. Witusiewicz, A. A. Bondar, Ulrike Hecht, J. Zollinger, L. V. Artyukh, T.ya. VelikanovaAbstract:Abstract The Thermodynamic Description of the ternary system Al–B–Ti is obtained by modelling the Gibbs energy of all individual phases in the system using the CALPHAD approach. The model parameters have been evaluated using the computer optimization technique PARROT based on the available Descriptions of the constituent binary systems Al–B, B–Ti and Al–Ti recently published and relevant experimental information on phase equilibria for the ternary system. For the ternary system Al–B–Ti the reaction scheme, projection of the liquidus, solidus and solvus surfaces, selected vertical and isothermal sections are calculated using the proposed Thermodynamic Description. An acceptable agreement between the calculations and experimental data is achieved.
-
the al b nb ti system ii Thermodynamic Description of the constituent ternary system b nb ti
Journal of Alloys and Compounds, 2008Co-Authors: V.t. Witusiewicz, A. A. Bondar, Ulrike Hecht, Stephan Rex, Ya T VelikanovaAbstract:Abstract The Thermodynamic Description of the ternary system B–Nb–Ti is obtained by modelling the Gibbs energy of all individual phases in the system using the CALPHAD approach. The model parameters have been evaluated by means of a computer optimization technique based on the available Descriptions of the constituent binary systems B–Nb, B–Ti and Nb–Ti and relevant experimental information on phase equilibria for the ternary system. The Thermodynamic Descriptions of both systems with boron, B–Nb and B–Ti, were published in the first part of the work. For the ternary system B–Nb–Ti several vertical and isothermal sections as well as the projection of the liquidus and solidus surface are calculated using the elaborated Thermodynamic Description. A tolerable agreement between the calculations and experimental data is achieved.
T.ya. Velikanova - One of the best experts on this subject based on the ideXlab platform.
-
Thermodynamic Description of the Al–C–Ti system
Journal of Alloys and Compounds, 2015Co-Authors: V.t. Witusiewicz, Bengt Hallstedt, A. A. Bondar, Ulrike Hecht, S. V. Sleptsov, T.ya. VelikanovaAbstract:Abstract Based on novel experimental data the Thermodynamic Description of the ternary Al–C–Ti system was subject to optimization using the CALPHAD approach (Thermo-Calc/PARROT). The reaction scheme, the projections of the liquidus and solidus surfaces, as well as a number of isothermal sections and isopleths were calculated using the proposed Thermodynamic Description and compared with the experimental results. The calculations were shown to adequately reproduce the experimental data. The main feature of the phase equilibria in the system is the existence of three ternary compounds P (Ti3AlC), H (Ti2AlC) and N (Ti3AlC2) forming peritectically from the liquid phase and TiC1−x carbide at 1907, 1865 and 2013 K, respectively. It is shown that these three compounds are Thermodynamically stable in a wide temperature interval.
-
The Al–B–Nb–Ti system: V. Thermodynamic Description of the ternary system Al–B–Ti
Journal of Alloys and Compounds, 2008Co-Authors: V.t. Witusiewicz, A. A. Bondar, Ulrike Hecht, J. Zollinger, L. V. Artyukh, T.ya. VelikanovaAbstract:Abstract The Thermodynamic Description of the ternary system Al–B–Ti is obtained by modelling the Gibbs energy of all individual phases in the system using the CALPHAD approach. The model parameters have been evaluated using the computer optimization technique PARROT based on the available Descriptions of the constituent binary systems Al–B, B–Ti and Al–Ti recently published and relevant experimental information on phase equilibria for the ternary system. For the ternary system Al–B–Ti the reaction scheme, projection of the liquidus, solidus and solvus surfaces, selected vertical and isothermal sections are calculated using the proposed Thermodynamic Description. An acceptable agreement between the calculations and experimental data is achieved.
-
The Al–B–Nb–Ti system: II. Thermodynamic Description of the constituent ternary system B–Nb–Ti
Journal of Alloys and Compounds, 2007Co-Authors: V.t. Witusiewicz, A. A. Bondar, Ulrike Hecht, Stephan Rex, T.ya. VelikanovaAbstract:Abstract The Thermodynamic Description of the ternary system B–Nb–Ti is obtained by modelling the Gibbs energy of all individual phases in the system using the CALPHAD approach. The model parameters have been evaluated by means of a computer optimization technique based on the available Descriptions of the constituent binary systems B–Nb, B–Ti and Nb–Ti and relevant experimental information on phase equilibria for the ternary system. The Thermodynamic Descriptions of both systems with boron, B–Nb and B–Ti, were published in the first part of the work. For the ternary system B–Nb–Ti several vertical and isothermal sections as well as the projection of the liquidus and solidus surface are calculated using the elaborated Thermodynamic Description. A tolerable agreement between the calculations and experimental data is achieved.
