Enhanced strength and ductility of bulk CoCrFeMnNi high entropy alloy having fully recrystallized ultrafine-grained structure
Enhanced strength and ductility of bulk CoCrFeMnNi high entropy alloy having fully recrystallized ultrafine-grained structure
复制标题
具有完全再结晶超细晶结构的大块CoCrFeMnNi高熵合金的增强强度和延展性
DOI：
10.1016/j.matdes.2017.07.054
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发表时间：
2017-11-05
影响因子：
8.4
通讯作者：
Zhang, Z. F.
中科院分区：
文献类型：
--
作者：
Sun, S. J.;Tian, Y. Z.;Zhang, Z. F.
报道了一种高效磁悬浮熔炼技术，用于制备直径为110 mm的等原子CoCrFeMnNi高熵合金（HEA）块体锭，该块体锭既可锻造也可轧制。特别地，通过简单的冷轧和退火工艺成功地获得了具有503 +/- 181 nm的最小晶粒尺寸的完全再结晶的超细晶（UFG）HEA。HEA的拉伸性能进行了研究，通过改变晶粒尺寸从UFG制度的粗晶制度。由于层错能低，UFG HEA表现出强度和延展性的良好平衡。当晶粒尺寸在503 nm ~ 88.9 μ m范围内时，线性Hall-Petch关系拟合良好。(C)2017爱思唯尔有限公司版权所有
A high efficient magnetic levitation melting technique was reported for fabricating bulk equiatomic CoCrFeMnNi high-entropy alloy (HEA) ingot with a diameter of 110 mm. The bulk ingot can be either forged or rolled. In particular, fully recrystallized ultrafine-grained (UFG) HEA with a minimum grain size of 503 +/- 181 nm was successfully obtained through a simple cold rolling and annealing process. The tensile properties of the HEA were studied by changing the grain size from the UFG regime to the coarse-grained regime. The UFG HEA exhibited a good balance of strength and ductility due to the low stacking fault energy. The linear Hall-Petch relationship was well fitted when the grain sizes range from 503 nm to 88.9 mu m. (C) 2017 Elsevier Ltd. All rights reserved.