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Hengcheng Liao - One of the best experts on this subject based on the ideXlab platform.
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peritectic reaction between two primary mn rich phases during solidification of al si cu mn heat Resistant Alloy and the effect of cooling rate on it
Journal of Alloys and Compounds, 2018Co-Authors: Hengcheng Liao, Jingfan Tang, Baojun ZhaoAbstract:Abstract In order to demonstrate the transformation relation of two primary Al13Mn4Si8 and Al15Mn3Si2 phases during solidification of Al-12Si-4Cu-2Mn (in wt%) Alloy, verification experiments through controlling cooling rate of solidification and quenching at different stages during solidification were designed and the microstructure was characterized by optical microscope, scanning electron microscope and transmission electron microscope. The cooling rate during solidification plays a decisive role in the formation of primary Mn-rich phases. Fast cooling rate favors the slender rod-like Al13Mn4Si8 phase and slow cooling rate leads to the formation of dendritic Al15Mn3Si2 phase. A great number of symbiotic complexes, constituted with inner Al13Mn4Si8 and outer Al15Mn3Si2 phases, are found in the transition area of the surface and center of the casting with a middle cooling rate. Microstructure observation of the liquid quenching samples demonstrates that the first phase formed during solidification must be 2D lath-like Al13Mn4Si8 phase whether with high cooling rate or with slow cooling rate. And 3D dendritic Al15Mn3Si2 phase is transformed from 2D Al13Mn4Si8 by a peritectic reaction: L+ Al13Mn4Si8→All5Mn3Si2, which is dependent of the cooling rate during solidification. A schematic model with double nose curves was established to exhibit the influence of cooling rate on the peritectic reaction. With sufficient high cooling rate, this peritectic reaction will be suppressed completely. When the cooling rate is slow enough, the peritectic reaction will proceed completely. However, in case of middle rate, the peritectic reaction will happen but incompletely.
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cr induced morphology change of primary mn rich phase in al si cu mn heat Resistant aluminum Alloys and its contribution to high temperature strength
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2018Co-Authors: Hengcheng Liao, Xiaojing Suo, Yunyi Tang, U S Dixit, Pavel PetrovAbstract:Abstract Effect of Cr addition on the microstructure and mechanical properties of Al-12 wt%Si-3.5 wt%Cu-2 wt%Mn heat-Resistant Alloy were studied by OM, XRD and SEM microstructure observation and tension test at different temperature. Results indicate that Cr addition can obviously change the morphology of the primary Mn-rich phase in Al-12 wt%Si-3.5 wt. Cu-2 wt%Mn, from slender rods to dendrites first and then to star-type particles. XRD and SEM-EDS results suggest that no new Cr-rich phase is formed in the studied Alloy, and Cr is mainly dissolved in the Mn-rich phase, besides partially in the matrix. Addition of Cr can significantly increases strength and elongation at room temperature and high temperature. When Cr addition level is at 1.0%, the strength at 350 °C reaches to the highest value of 106 MPa, about 28% higher than that without addition of Cr. In the Alloys with or without Cr addition, the internal cracks originate from and propagate along the primary Mn-rich phase during tension at 350 °C.
Pavel Petrov - One of the best experts on this subject based on the ideXlab platform.
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cr induced morphology change of primary mn rich phase in al si cu mn heat Resistant aluminum Alloys and its contribution to high temperature strength
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2018Co-Authors: Hengcheng Liao, Xiaojing Suo, Yunyi Tang, U S Dixit, Pavel PetrovAbstract:Abstract Effect of Cr addition on the microstructure and mechanical properties of Al-12 wt%Si-3.5 wt%Cu-2 wt%Mn heat-Resistant Alloy were studied by OM, XRD and SEM microstructure observation and tension test at different temperature. Results indicate that Cr addition can obviously change the morphology of the primary Mn-rich phase in Al-12 wt%Si-3.5 wt. Cu-2 wt%Mn, from slender rods to dendrites first and then to star-type particles. XRD and SEM-EDS results suggest that no new Cr-rich phase is formed in the studied Alloy, and Cr is mainly dissolved in the Mn-rich phase, besides partially in the matrix. Addition of Cr can significantly increases strength and elongation at room temperature and high temperature. When Cr addition level is at 1.0%, the strength at 350 °C reaches to the highest value of 106 MPa, about 28% higher than that without addition of Cr. In the Alloys with or without Cr addition, the internal cracks originate from and propagate along the primary Mn-rich phase during tension at 350 °C.
Baojun Zhao - One of the best experts on this subject based on the ideXlab platform.
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peritectic reaction between two primary mn rich phases during solidification of al si cu mn heat Resistant Alloy and the effect of cooling rate on it
Journal of Alloys and Compounds, 2018Co-Authors: Hengcheng Liao, Jingfan Tang, Baojun ZhaoAbstract:Abstract In order to demonstrate the transformation relation of two primary Al13Mn4Si8 and Al15Mn3Si2 phases during solidification of Al-12Si-4Cu-2Mn (in wt%) Alloy, verification experiments through controlling cooling rate of solidification and quenching at different stages during solidification were designed and the microstructure was characterized by optical microscope, scanning electron microscope and transmission electron microscope. The cooling rate during solidification plays a decisive role in the formation of primary Mn-rich phases. Fast cooling rate favors the slender rod-like Al13Mn4Si8 phase and slow cooling rate leads to the formation of dendritic Al15Mn3Si2 phase. A great number of symbiotic complexes, constituted with inner Al13Mn4Si8 and outer Al15Mn3Si2 phases, are found in the transition area of the surface and center of the casting with a middle cooling rate. Microstructure observation of the liquid quenching samples demonstrates that the first phase formed during solidification must be 2D lath-like Al13Mn4Si8 phase whether with high cooling rate or with slow cooling rate. And 3D dendritic Al15Mn3Si2 phase is transformed from 2D Al13Mn4Si8 by a peritectic reaction: L+ Al13Mn4Si8→All5Mn3Si2, which is dependent of the cooling rate during solidification. A schematic model with double nose curves was established to exhibit the influence of cooling rate on the peritectic reaction. With sufficient high cooling rate, this peritectic reaction will be suppressed completely. When the cooling rate is slow enough, the peritectic reaction will proceed completely. However, in case of middle rate, the peritectic reaction will happen but incompletely.
Yu A Churilov - One of the best experts on this subject based on the ideXlab platform.
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numerical simulation of high temperature creep of elements of heat Resistant Alloys structures taking into account neutron irradiation effects
Journal of Personality and Social Psychology, 2019Co-Authors: A A Antipov, V A Gorokhov, V V Egunov, D A Kazakov, S A Kapustin, Yu A ChurilovAbstract:The technique of numerical research on the basis of FEM processes of deformation and damage accumulation in the structural elements of heat-Resistant Alloys under conditions of high-temperature creep taking into account the influence of neutron irradiation is developed. The description of the mechanical behavior of the material is carried out within the framework of the previously developed general model of the damaged material and the creep model for non-irradiated heat-Resistant Alloys, supplemented by taking into account the effect of irradiation on the creep rate and the appearance of brittle fracture in a given range of temperature variation and irradiation intensity. The defining relations of the creep model of the irradiated material were obtained by modifying the creep model of the non-irradiated material: a material function was introduced, taking into account the effect of the flux of neutrons on the rate of thermal creep deformation; a material function was introduced that takes into account the effect of the neutron flux on the creep surface radius; A material function was introduced, which takes into account the effect of the neutron flux on the ultimate value of the dissipation energy at full power. To simulate the processes of brittle fracture during creep under neutron irradiation conditions, it is assumed that the destructive values of effective normal stresses are a function of temperature, flux of neutrons and the current value of accumulated creep. The material functions of the model were obtained from the results of basic experiments conducted at the Research Institute of Mechanics for the heat-Resistant Alloy without irradiation under consideration and the available experimental data on the study of the creep of this Alloy during its irradiation. Based on the proposed model, a numerical method for solving problems of high-temperature creep of structures made of heat-Resistant Alloys under neutron irradiation was developed and implemented within the UPAKS computing complex. To verify and illustrate the capabilities of the developed methodological and software tools, a number of problems of modeling the processes of high-temperature creep and destruction of structural elements made of the high-temperature Alloy under consideration are solved.
Xiaojing Suo - One of the best experts on this subject based on the ideXlab platform.
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cr induced morphology change of primary mn rich phase in al si cu mn heat Resistant aluminum Alloys and its contribution to high temperature strength
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2018Co-Authors: Hengcheng Liao, Xiaojing Suo, Yunyi Tang, U S Dixit, Pavel PetrovAbstract:Abstract Effect of Cr addition on the microstructure and mechanical properties of Al-12 wt%Si-3.5 wt%Cu-2 wt%Mn heat-Resistant Alloy were studied by OM, XRD and SEM microstructure observation and tension test at different temperature. Results indicate that Cr addition can obviously change the morphology of the primary Mn-rich phase in Al-12 wt%Si-3.5 wt. Cu-2 wt%Mn, from slender rods to dendrites first and then to star-type particles. XRD and SEM-EDS results suggest that no new Cr-rich phase is formed in the studied Alloy, and Cr is mainly dissolved in the Mn-rich phase, besides partially in the matrix. Addition of Cr can significantly increases strength and elongation at room temperature and high temperature. When Cr addition level is at 1.0%, the strength at 350 °C reaches to the highest value of 106 MPa, about 28% higher than that without addition of Cr. In the Alloys with or without Cr addition, the internal cracks originate from and propagate along the primary Mn-rich phase during tension at 350 °C.