Effects of strain rate on room- and cryogenic-temperature compressive properties in metastable V10Cr10Fe45Co35 high-entropy alloy

被引：36
作者：
Song, Hyejin [1 ,2 ]
Kim, Dong Geun [1 ]
Kim, Dae Woong [1 ]
Jo, Min Cheol [1 ]
Jo, Yong Hee [1 ]
Kim, Wooyeol [1 ]
Kim, Hyoung Seop [1 ]
Lee, Byeong-Joo [1 ]
Lee, Sunghak [1 ]
机构：
[1] Pohang Univ Sci & Technol, Ctr High Entropy Alloys, Pohang 790784, South Korea
[2] Korea Inst Ind Technol, Extreme Fabricat Technol Grp, Daegu 42994, South Korea
来源：
SCIENTIFIC REPORTS | 2019年 / 9卷 / 1期
基金：
新加坡国家研究基金会;
关键词：
STACKING-FAULT ENERGY; ZENER-HOLLOMON PARAMETER; DEFORMATION-BEHAVIOR; INDUCED PLASTICITY; ACTIVATION-ENERGY; TRANSFORMATION; DEPENDENCE; DESIGN; STEEL; MICROSTRUCTURE;
D O I：
10.1038/s41598-019-42704-x
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
Quasi-static and dynamic compressive properties of an FCC-based metastable HEA (composition; V10Cr10Fe45Co35 (at.%)) showing both Transformation Induced Plasticity (TRIP) and TWinning Induced Plasticity (TWIP) were investigated at room and cryogenic temperatures. During the quasistatic and dynamic compression at room temperature, the FCC to BCC TRIP occurred inside FCC grains, and resulted in very high strain-hardening rate and consequently maximum compressive strength over 1.6 GPa. The dynamic compressive strength was higher by 240 MPa than the quasi-static strength because of strain-rate-hardening effect, and kept increasing with a high strain-hardening rate as the twinning became activated. The cryogenic-temperature strength was higher than the room-temperature strength as the FCC to BCC TRIP amount increased by the decrease in stability of FCC phase with decreasing temperature. Under dynamic loading at cryogenic temperature, twins were not formed because the increase in SFE due to adiabatic heating might not be enough to reach the TWIP regime. However, the dynamically compressed specimen showed the higher strength than the quasistatically compressed specimen as the strain-rate-hardening effect was added with the TRIP.
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页数：12
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