Tailoring phase transformation strengthening and plasticity of nanostructured high entropy alloys

Nanoscale ◽  
2020 ◽  
Vol 12 (26) ◽  
pp. 14135-14149
Author(s):  
Y. F. Zhao ◽  
X. B. Feng ◽  
J. Y. Zhang ◽  
Y. Lu ◽  
S. H. Wu ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transformation ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Phase Transformation Strengthening

Phase transformation strengthening and plasticity of nanostructured FeCoCrNi thin films can be tailored utilizing constraining effects. The transformation occurs only in FeCoCrNi/Ni nanolaminates with large h while not in FeCoCrNi/Ni.

scholarly journals Magnetically-driven phase transformation strengthening in high entropy alloys

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Changning Niu ◽  
Carlyn R. LaRosa ◽  
Jiashi Miao ◽  
Michael J. Mills ◽  
Maryam Ghazisaeidi
Keyword(s):  
Phase Transformation ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Phase Transformation Strengthening

Novel high-entropy alloys with high-density ε-D019 and abnormal phase transformation

2021 ◽  
Vol 199 ◽  
pp. 113893
Author(s):  
G.H. Xia ◽  
Z.L. Ma ◽  
Z.Q. Xu ◽  
M. Wang ◽  
X.W. Cheng ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Density ◽  
High Entropy Alloys ◽  
High Entropy

Probing the phase transformation and dislocation evolution in dual-phase high-entropy alloys

2019 ◽  
Vol 114 ◽  
pp. 161-173 ◽  
Author(s):  
Qihong Fang ◽  
Yang Chen ◽  
Jia Li ◽  
Chao Jiang ◽  
Bin Liu ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Dual Phase ◽  
High Entropy Alloys ◽  
High Entropy

Effect of Si element on phase transformation and mechanical properties for FeCoCrNiSix high entropy alloys

2021 ◽  
Vol 282 ◽  
pp. 128809
Author(s):  
Lei Huang ◽  
Xuejie Wang ◽  
Fuchao Jia ◽  
Xingchuan Zhao ◽  
Baoxu Huang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Phase Transformation ◽  
High Entropy Alloys ◽  
High Entropy

Toughening FeMn-based high-entropy alloys via retarding phase transformation

2020 ◽  
Vol 51 ◽  
pp. 167-172
Author(s):  
Ran Wei ◽  
Kaisheng Zhang ◽  
Liangbin Chen ◽  
Zhenhua Han ◽  
Chen Chen ◽  
...  
Keyword(s):  
Phase Transformation ◽  
High Entropy Alloys ◽  
High Entropy

scholarly journals Kinetic ways of tailoring phases in high entropy alloys

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Feng He ◽  
Zhijun Wang ◽  
Yiyan Li ◽  
Qingfeng Wu ◽  
Junjie Li ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Equilibrium Phase ◽  
High Entropy Alloys ◽  
Kinetic Effect ◽  
Phase Selection ◽  
High Entropy ◽  
Comprehensive Performance ◽  
Sluggish Diffusion ◽  
Kinetics Of ◽  
Theoretical Analyses

Abstract The comprehensive performance of high entropy alloys (HEAs) depends on the phase selection significantly. However, up to now, investigations of the phase selection in HEAs mainly focused on the thermodynamic equilibrium phase, while kinetic ways of tailoring the phases in HEAs are seldom considered. In HEAs, the kinetics of sluggish diffusion and the numerous possible phases make the kinetics of phase transformation more complex and intriguing. Here, the kinetic effect in CoCrFeNiTi0.4 HEAs was investigated to reveal the possibility of controlling phase selection via kinetic ways for HEAs. The σ, γ′ and R phases in the CoCrFeNiTi0.4 HEA can be controlled under different cooling rate both in solidification and solid transformation. The theoretical analyses revealed the kinetic effect on phase selection. The method proposed here, tailoring the phases with different kinetic ways, could be used to prepare promising HEAs with very rich composition design.

scholarly journals The Microstructures and Electrical Resistivity of (Al, Cr, Ti)FeCoNiOxHigh-Entropy Alloy Oxide Thin Films

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Chun-Huei Tsau ◽  
Zhang-Yan Hwang ◽  
Swe-Kai Chen
Keyword(s):  
Thin Films ◽  
Oxide Films ◽  
Annealing Treatment ◽  
Metallic Alloys ◽  
Vacuum Furnace ◽  
High Entropy Alloys ◽  
Oxide Thin Films ◽  
Metal Oxide Films ◽  
High Entropy ◽  
Feconi Alloy

The (Al, Cr, Ti)FeCoNi alloy thin films were deposited by PVD and using the equimolar targets with same compositions from the concept of high-entropy alloys. The thin films became metal oxide films after annealing at vacuum furnace for a period; and the resistivity of these thin films decreased sharply. After optimum annealing treatment, the lowest resistivity of the FeCoNiOx, CrFeCoNiOx, AlFeCoNiOx, and TiFeCoNiOxfilms was 22, 42, 18, and 35 μΩ-cm, respectively. This value is close to that of most of the metallic alloys. This phenomenon was caused by delaminating of the alloy oxide thin films because the oxidation was from the surfaces of the thin films. The low resistivity of these oxide films was contributed to the nonfully oxidized elements in the bottom layers and also vanishing of the defects during annealing.

Evolution of Microstructures and Properties of the AlxCrCuFeNi2 High-Entropy Alloys

2013 ◽  
Vol 745-746 ◽  
pp. 706-714 ◽  
Author(s):  
Sheng Guo Ma ◽  
Zhao Di Chen ◽  
Yong Zhang
Keyword(s):  
Phase Transformation ◽  
Cast Alloy ◽  
Alloy System ◽  
Molar Ratio ◽  
High Entropy Alloys ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Entropy ◽  
Heat Treated ◽  
Xrd Patterns

The microstructure and Vickers hardness of the AlxCrCuFeNi2(x=0.5, 1.0, and 2.0 in molar ratio) high-entropy alloys with as-cast and heat-treated states were investigated. X-ray diffraction (XRD) patterns suggested that for the Al0.5 alloy annealed at 900,an incomplete phase transformation from FCC to BCC occurred, while for the Al2.0 alloy as heated at 500 and 700, a converse phase transformation from BCC to FCC was obtained. Compared with the as-cast dendrites, after heat treatment, the microstructure of the alloys was obviously coarsened or spheroidized or homogenized, whereas the resultant hardness has almost not decreased even at high heating temperatures, which indicated the probability of ordering for this alloy system and thus effectively compensating the stress and structural relaxations. The Al2.0 alloy reached the maximum hardness value of 610 HV by annealing at 1100, which might be ascribed to the worm-like nanoprecipitations and the enhanced fraction of B2-ordered precipitations. By cold rolling, the Al0.5 alloy is able to reach the yield strength of 1055 MPa and the fracture strength of 1179 MPa, which was a significant improvement in comparison with the as-cast alloy.

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