Room-Temperature Superformability in Novel As-Cast High-Entropy Alloy During Compressive Loading

被引：6
作者：
Dutta, A. [1 ]
Tung, Shu-Yi [2 ]
Gupta, Saurabh Kumar [3 ]
Tsai, Ming-Hung [2 ]
Nene, Saurabh S. S. [1 ]
机构：
[1] Indian Inst Technol Jodhpur, Dept Met & Mat Engn, Adv Mat Design & Proc Grp, Jodhpur 342037, Rajasthan, India
[2] Natl Chung Hsing Univ, Dept Mat Sci & Engn, Taichung 402, Taiwan
[3] Indian Inst Sci, Dept Mat Engn, Lab Texture & Related Studies, Bangalore 560012, Karnataka, India
来源：
ADVANCED ENGINEERING MATERIALS | 2023年 / 25卷 / 08期
关键词：
compression tests; formability; high-entropy alloys; metastable phases; twinning; MECHANICAL-PROPERTIES; MICROSTRUCTURE; DEFORMATION; BEHAVIOR; DESIGN; SHEAR;
D O I：
10.1002/adem.202201347
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Conventional alloys show low compressive strength and strain accommodation due to their propensity for limited strengthening mechanisms and rapid compressive instability. High-entropy alloys (HEA) may overcome this limitation by metastability engineering. Inspired by this, herein, a dual-phase Fe44Mn20Cr15Ni7.5Co6Si7.5 HEA (M-HEA) which shows maximum engineering strength of approximate to 4.4 GPa at true compressive strain of approximate to 2.2 (engineering strain of 90%) in as-cast condition due to controlled hardening and sustained softening response during deformation is presented. The controlled hardening phenomenon (up to 60% strain) is attributed to transformation-induced plasticity in gamma-phase and nanotwinning in untransformed gamma-phase. The sustained softening is a result of extensive strain accommodation by both gamma- and beta-phases via dynamic recovery in gamma-phase and shearing of beta-phase during deformation. Hence, this superformability in M-HEA makes it an excellent material for structural applications in comparison with other conventional alloys and HEAs.
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页数：8
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