Enhancement of <001> recrystallization texture in non-equiatomic Fe-Ni-Co-Al-based high entropy alloys by combination of annealing and Cr addition

被引:18
作者
Zhang, Cheng [1 ]
Zhu, Chaoyi [1 ]
Shin, Sumin [1 ]
Vecchio, Kenneth [1 ,2 ]
机构
[1] Univ Calif San Diego, Mat Sci & Engn Program, La Jolla, CA 92093 USA
[2] Univ Calif San Diego, Dept NanoEngn, La Jolla, CA 92093 USA
关键词
Non-equiatomic; High entropy alloy; Texture; Abnormal grain growth; Low angle boundaries; STACKING-FAULT ENERGY; GRAIN-SIZE; MECHANICAL-PROPERTIES; MICROSTRUCTURE; PHASE; EVOLUTION; DUCTILITY; DESIGN; DEFORMATION; TEMPERATURE;
D O I
10.1016/j.jallcom.2018.07.221
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Formation of strong <001> recrystallization texture in new non-equiatomic Fe-Ni-Co-Al-based high entropy alloys has been investigated. Optimal annealing temperature and time to obtain strong <001> texture is subsequently determined through microstructure and recrystallization texture study of cold-rolled NCACB (34.95Fe-27.5Ni-17.5Co-11.5Al-8.5Cr-0.05B at.%) at 1200 degrees C and 1300 degrees C for different annealing times. It has also been found that the recrystallization texture is influenced by grain growth and the relative grain size (d/t, d-grain size, t-sheet thickness). Furthermore, contribution of chemical composition to <001> texture has been examined in two additional cold-rolled non-equiatomic high entropy alloys, NCAB (Fe-27.5Ni-17.5Co-11.5Al-0.05B at.%) and NCATB (Fe-27.5Ni-17.5Co-11.5Al-2.5Ta0.05B at.%), under the same optimal annealing condition used for NCACB. Comparison of texture intensity of NCAB, NCATB, and NCACB demonstrates that Cr is very effective in the formation of strong <001> recrystallization texture of Fe-Ni-Co-Al-based alloys. Based on low-angle boundary statistics, it is hypothesized that decrease in stacking fault energy is responsible for the enhanced recrystallization texture in NCACB. Additionally, it is demonstrated employing a Zener-type model for the pinning of grain boundaries by second-phase particles, that precipitated NiAl particles facilitate the abnormal grain growth in NCACB. The tensile tests results show that strong recrystallization texture and bamboo-like structure improve the ductility of NCACB. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码:277 / 286
页数:10
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