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J Eckert - One of the best experts on this subject based on the ideXlab platform.
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deformation mechanisms to ameliorate the mechanical properties of novel trip twip co cr mo cu ultrafine Eutectic Alloys
Scientific Reports, 2017Co-Authors: Jeong Tae Kim, Sung Hwan Hong, Hae Jin Park, Y S Kim, Jinyoo Suh, J K Lee, Jongae Park, T Maity, J EckertAbstract:In the present study, the microstructural evolution and the modulation of the mechanical properties have been investigated for a Co-Cr-Mo (CCM) ternary Eutectic alloy by addition of a small amount of copper (0.5 and 1 at.%). The microstructural observations reveal a distinct dissimilarity in the Eutectic structure such as a broken lamellar structure and a well-aligned lamellar structure and an increasing volume fraction of Co lamellae as increasing amount of copper addition. This microstructural evolution leads to improved plasticity from 1% to 10% without the typical tradeoff between the overall strength and compressive plasticity. Moreover, investigation of the fractured samples indicates that the CCMCu alloy exhibits higher plastic deformability and combinatorial mechanisms for improved plastic behavior. The improved plasticity of CCMCu Alloys originates from several deformation mechanisms; i) slip, ii) deformation twinning, iii) strain-induced transformation and iv) shear banding. These results reveal that the mechanical properties of Eutectic Alloys in the Co-Cr-Mo system can be ameliorated by micro-alloying such as Cu addition.
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effect of sn on microstructure and mechanical properties of ti fe sn ultrafine Eutectic composites
Journal of Materials Research, 2010Co-Authors: Ralf Theissmann, W Loser, J EckertAbstract:High strength (Ti 0.705 Fe 0.295 ) 100- x Sn x (0 ≤ x ≤ 6) composites have been prepared through arc melting and cold crucible casting. The microstructure consists of two phase ultrafine Eutectic comprised of FeTi and β-Ti phases. The effect of Sn addition to the Ti 70.5 Fe 29.5 Eutectic is assessed in terms of microstructure variations such as Eutectic spacing, morphology, cell size, lattice parameter of the phases, and the resulting mechanical properties in terms of strength and plasticity under compression. The mechanical properties (maximum strength 1939 MPa, fracture strain 13.5%) of the ternary Ti-Fe-Sn (2 ≤ x ≤ 6) are considerably improved compared to the Ti 70.5 Fe 29.5 binary alloy (1733 MPa, 3.4%). The change in the morphology of the Eutectic, the microstructure refinement, structural fluctuations, and supersaturation in the β-Ti phase, and the elastic properties of nanophases are crucial factors for improving the plastic deformability of the ultrafine Eutectic Alloys without presence of any additional micrometer-size toughening phase.
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bulk ultra fine Eutectic structure in ti fe base Alloys
Journal of Alloys and Compounds, 2007Co-Authors: J Das, K B Kim, F Baier, W Loser, Annett Gebert, J EckertAbstract:Abstract An ultra-fine Eutectic structure has been obtained in the Ti 70.5 Fe 29.5 binary alloy by slow cooling from the melt through arc melting and cold crucible rod casting. The addition of 3.85 at.% Sn to the binary Ti–Fe alloy induces a change of the morphology of the Eutectic and increases the volume fraction of the FeTi ( Pm 3 m ) phase. A significant improvement of the plastic deformability of the ternary alloy has been observed under uniaxial compressive loading resulting in 16% strain to failure compared to 3.4% for binary Ti 70.5 Fe 29.5 . The morphology of the Eutectic colonies, their refinement and supersaturation of the β-Ti phase are crucial factors for improving the ductility of the ultra-fine Eutectic Alloys.
C T Liu - One of the best experts on this subject based on the ideXlab platform.
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designing Eutectic high entropy Alloys of cocrfeninbx
Journal of Alloys and Compounds, 2016Co-Authors: Zhijun Wang, Peng Cheng, Q Wang, Yingying Dang, Jincheng Wang, C T LiuAbstract:Abstract Based on surveying the existing binary phase diagrams with Eutectic points, a strategy of designing Eutectic high entropy Alloys (EHEAs) with desired high strength and ductility is proposed. Based on the computer-aided thermodynamic calculations, the pseudo Eutectic binary alloy system of CoCrFeNiNbx (x = 0.1, 0.25, 0.5 and 0.8) was designed. The experimental results show that the Eutectic Alloys are composed of a ductile face centered cubic (FCC) phase and a hard Laves phase with fine laminar structures. The designed Alloys show excellent integrated mechanical properties of ductility and strength. For the CoCrFeNiNb0.5 alloy, the compressive fracture strength and strain can reach above 2300 MPa and 23.6%, respectively.
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sunflower like solidification microstructure in a near Eutectic high entropy alloy
Materials research letters, 2013Co-Authors: Sheng Guo, C T LiuAbstract:Considering the inherent advantages of Eutectic Alloys as high-temperature materials, Eutectic high-entropy Alloys provide a brand new research direction for developing materials to be used in high-temperature environments. Along this line of thinking, the solidification microstructure in a near-Eutectic Al2CrCuFeNi2 alloy was studied. A unique sunflower-like Eutectic colony structure was observed, where the Ni–Al-rich B2 phase formed as the primary phase with a spherical or ellipsoidal morphology, the Ni–Al-rich B2/Cr-rich A2 Eutectics grew on the primary phase in a radial manner, and the primary B2 phase further decomposed into nearly cubic particles dispersed in the matrix at lower temperatures.
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anomalous solidification microstructures in co free alxcrcufeni2 high entropy Alloys
Journal of Alloys and Compounds, 2013Co-Authors: Sheng Guo, C T LiuAbstract:A series of cost effective Co-free AlxCrCuFeNi2 high entropy Alloys were developed, following the valence electron concentration rule. The solidification microstructure in these Alloys showed some anomalies that were rarely seen in other high entropy Alloys or multi-component Alloys. Specifically, submicron rod-like microstructures existed in the Eutectic alloy in spite of the high volume percentage of the rod-like phase; sunflower-like microstructures existed in the hyper-Eutectic Alloys, with 200 nm sized spinodal decomposed seed particles densely distributed in the disk floret. (c) 2013 Elsevier B.V. All rights reserved.
Aru Yan - One of the best experts on this subject based on the ideXlab platform.
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grain boundary diffusion behaviors in hot deformed nd2fe14b magnets by prnd cu low Eutectic Alloys
Journal of Magnetism and Magnetic Materials, 2018Co-Authors: Xu Tang, Renjie Chen, Chaoxiang Jin, Wenzong Yin, Don Lee, Aru YanAbstract:Abstract High coercivity of hot-deformed Nd 2 Fe 14 B magnets was obtained by grain boundary diffusion. Comparable squareness and similar magnetic properties for samples diffusing from side and pole surfaces show little discrepancies if quantities of the infiltrated PrNd-Cu low Eutectic Alloys is enough to obtain sufficient diffusion. However, the microstructures and higher characteristic peak ratios show preferable orientation of grains near surfaces of the sample diffused from side surfaces than that from pole surfaces. Amorphous Nd-rich phases and crystal Fe-rich phases were both observed in the diffused magnets. The enhancement of coercivity is considered to be resulted from grain boundary optimization and magnetic isolation which is caused by the thickened nonmagnetic intergranular phases.
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grain boundary diffusion behaviors in hot deformed nd 2 fe 14 b magnets by prnd cu low Eutectic Alloys
Journal of Magnetism and Magnetic Materials, 2018Co-Authors: Xu Tang, Renjie Chen, Chaoxiang Jin, Wenzong Yin, Don Lee, Aru YanAbstract:Abstract High coercivity of hot-deformed Nd 2 Fe 14 B magnets was obtained by grain boundary diffusion. Comparable squareness and similar magnetic properties for samples diffusing from side and pole surfaces show little discrepancies if quantities of the infiltrated PrNd-Cu low Eutectic Alloys is enough to obtain sufficient diffusion. However, the microstructures and higher characteristic peak ratios show preferable orientation of grains near surfaces of the sample diffused from side surfaces than that from pole surfaces. Amorphous Nd-rich phases and crystal Fe-rich phases were both observed in the diffused magnets. The enhancement of coercivity is considered to be resulted from grain boundary optimization and magnetic isolation which is caused by the thickened nonmagnetic intergranular phases.
Tomasz Gancarz - One of the best experts on this subject based on the ideXlab platform.
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Wetting of Cu and Al by Sn-Zn and Zn-Al Eutectic Alloys
Journal of Materials Engineering and Performance, 2012Co-Authors: Janusz Pstruś, Przemysław Fima, Tomasz GancarzAbstract:Wetting properties of Sn-Zn and Zn-Al Alloys on Cu and Al substrates were studied. Spreading tests were carried out for 3 min, in air and under protective atmosphere of nitrogen, with the use of fluxes. In the case of Zn-Al Eutectic, spreading tests were carried out at 460, 480, 500, and 520 °C, and in the case of Sn-Zn Eutectic at 250, 300, 350, 400, 450, and 500 °C, respectively. Solidified solder/substrate couples were cross-sectioned and subjected to microstructure examination. The spreading tests indicated that the wetting properties of Eutectic Sn-Zn Alloys, on copper pads do not depend on temperature (up to 400 °C), but in the lack of protective atmosphere, the solder does not wet the pads. Wettability studies of Zn-Al Eutectic on aluminum and copper substrates have shown a negative effect of the protective nitrogen atmosphere on the wetting properties, especially for the copper pads. Furthermore, it was noted that with increasing temperature the solder wettability is improved. In addition, densities of liquid solders were studied by means of dilatometric technique.
Przemysław Fima - One of the best experts on this subject based on the ideXlab platform.
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Wetting of Cu and Al by Sn-Zn and Zn-Al Eutectic Alloys
Journal of Materials Engineering and Performance, 2012Co-Authors: Janusz Pstruś, Przemysław Fima, Tomasz GancarzAbstract:Wetting properties of Sn-Zn and Zn-Al Alloys on Cu and Al substrates were studied. Spreading tests were carried out for 3 min, in air and under protective atmosphere of nitrogen, with the use of fluxes. In the case of Zn-Al Eutectic, spreading tests were carried out at 460, 480, 500, and 520 °C, and in the case of Sn-Zn Eutectic at 250, 300, 350, 400, 450, and 500 °C, respectively. Solidified solder/substrate couples were cross-sectioned and subjected to microstructure examination. The spreading tests indicated that the wetting properties of Eutectic Sn-Zn Alloys, on copper pads do not depend on temperature (up to 400 °C), but in the lack of protective atmosphere, the solder does not wet the pads. Wettability studies of Zn-Al Eutectic on aluminum and copper substrates have shown a negative effect of the protective nitrogen atmosphere on the wetting properties, especially for the copper pads. Furthermore, it was noted that with increasing temperature the solder wettability is improved. In addition, densities of liquid solders were studied by means of dilatometric technique.
