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发布时间：2019-03-13

论文类型：期刊论文

发表时间：2019-02-15

发表刊物：MATERIALS LETTERS

收录刊物：Scopus、SCIE

卷号：237

页面范围：220-223

ISSN号：0167-577X

关键字：Void nucleation; Void coalescence; Deformation and fracture; Microstructure; High entropy alloy

摘要：In situ scanning electron microscope (SEM) investigation is carried out on high-entropy alloy (HEA) specimen with various geometries to realize the multi-axial stress states. The dimple structure on the fracture surface is quantified and the nucleation of void is examined. The deformation twins can provide more sites for void nucleation and constrain shape change of the voids. Even under the low stress-triaxiality, the void can coalesce to reach large size accompanying twinning. The evolution of void size and density deduced from the fractograph is important to quantify ductile fracture of HEA. (C) 2018 Elsevier B.V. All rights reserved.