Fatigue behavior of ultrafine grained triplex Al0.3CoCrFeNi high entropy alloy
Fatigue behavior of ultrafine grained triplex Al0.3CoCrFeNi high entropy alloy
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DOI：
10.1016/j.scriptamat.2018.08.048
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发表时间：
2019-01-01
影响因子：
6
通讯作者：
Mishra, Rajiv S.
中科院分区：
文献类型：
--
作者：
Liu, Kaimiao;Komarasamy, Mageshwari;Mishra, Rajiv S.
超细晶（UFG）合金的应变硬化有限，因此延展性降低。形变孪晶的引入可以克服这一限制。对Al 0.3CoCrFeNi高熵合金进行热机械加工，以产生具有FCC、硬B2和σ相的UFG三重显微组织（d（平均）：0.71 +/-035 μ m）。退火后的材料表现出优异的强度-延展性组合，极限拉伸强度（UTS）类似于1.1 GPa，伸长率类似于25%。此外，该合金显示出优异的耐疲劳性，其疲劳极限类似于0.43 UTS。显着的机械性能归因于大范围变形纳米双晶的形成和增加的位错积累能力。(C)2018 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Ultrafine grained (UFG) alloys suffer from limited strain hardening hence reduced ductility. Incorporation of deformation twinning can overcome this limitation. An Al0.3CoCrFeNi high-entropy alloy was thermo-mechanically processed to yield a UFG triplex microstructure (d(avg): 0.71 +/- 035 mu m) with FCC, and hard B2 and sigma phases. The annealed material exhibited an exceptional strength-ductility combination with ultimate tensile strength (UTS) of similar to 1.1 GPa and elongation of similar to 25%. Furthermore, the alloy showed excellent fatigue resistance with an endurance limit of similar to 0.43 UTS. Remarkable mechanical properties are attributed to the formation of extensive deformation nanotwins and increased dislocation accumulation capability. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.