Strain localization and fatigue crack formation at (0001) twist boundaries in titanium alloys

被引：55
作者：
Hemery, S. [1 ]
Stinville, J. C. [2 ,3 ]
Wang, F. [2 ]
Charpagne, M. A. [2 ]
Emigh, M. G. [2 ]
Pollock, T. M. [2 ]
Valle, V. [1 ]
机构：
[1] Univ Poitiers, Inst Pprime, CNRS UPR 3346, ISAE ENSMA, Teleport 2,1 Ave Clement Ader,BP 40109, F-86961 Futuroscope, France
[2] Univ Calif Santa Barbara, Mat Dept, Santa Barbara, CA 93106 USA
[3] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL USA
来源：
ACTA MATERIALIA | 2021年 / 219卷
关键词：
Titanium alloys; slip; grain boundary; fatigue crack initiation; strain localization; HIGH-CYCLE FATIGUE; COLD-DWELL FATIGUE; MECHANICAL-PROPERTIES; ELECTRON-MICROSCOPY; CRYSTAL PLASTICITY; SENSITIVE FATIGUE; INITIATION; TI-6AL-4V; MICROSTRUCTURE; SLIP;
D O I：
10.1016/j.actamat.2021.117227
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The process of crack initiation has been investigated in three widely used titanium alloys with different microstructures and loading conditions. Using low-cycle fatigue tests, a unique crack nucleation mechanism involving strain localization at (0001) twist boundaries has been identified. In order to constitute a potential crack initiation site, the twist boundary must experience a high resolved shear stress and a high normal stress. Crack initiation at these boundaries is most frequently associated with twist angles spanning the 10 degrees - 20 degrees range. Deformation prior to crack initiation at these rare microstructural configurations has been characterized using transmission electron microscopy and high-resolution digital image correlation across large fields of view. The (0001) twist boundaries ar e pr efer ential locations for early and intense strain localization. Prior to crack nucleation, deformation proceeds via shear along such boundaries where no beta layer at the interface was evidenced. The presently discussed crack formation mechanism is believed to be of broad relevance as it is not significantly influenced by microstructural parameters such as the alpha grain size, the degree of microtexture, the beta phase fraction or the surrounding microstructure as well as alpha and beta compositions. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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页数：15
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