Strength enhancement of high entropy alloy HfNbTaTiZr by severe plastic deformation
Strength enhancement of high entropy alloy HfNbTaTiZr by severe plastic deformation
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DOI：
10.1016/j.jallcom.2018.07.319
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发表时间：
2018-11-05
影响因子：
6.2
通讯作者：
Kim, H. S.
中科院分区：
文献类型：
--
作者：
Cizek, J.;Hausild, P.;Kim, H. S.
采用高压扭转方法加工出具有超细晶结构、晶粒尺寸接近80 nm的难熔金属高熵合金HfNbTaTiZr。研究了随着应变增加的微观结构、晶格缺陷和机械性能的发展。 HfNbTaTiZr 合金的晶粒细化变形至等效应变 e 接近 50，导致强度显着提高，同时保持足够的延展性。然而，进一步应变 e > 100 会导致强度下降和延展性损失，这是由于严重塑性变形引入的空位促进了固溶体的分解。 (C) 2018 Elsevier B.V. 保留所有权利。
Refractory metal high entropy alloy HfNbTaTiZr with ultrafine grained structure and grain size of approximate to 80 nm was processed by high pressure torsion. The development of microstructure, lattice defects and mechanical properties with increasing strain was examined. Grain refinement of HfNbTaTiZr alloy deformed up to the equivalent strain e approximate to 50 resulted in a significant enhancement of strength while keeping sufficient ductility. However, further straining e > 100 led to a decrease of strength and the loss of ductility due to the decomposition of solid solution facilitated by vacancies introduced by severe plastic deformation. (C) 2018 Elsevier B.V. All rights reserved.