Study fatigue crack initiation in TiB2/Al-Cu-Mg composite by in-situ SEM and X-ray microtomography

被引：31

作者：

Geng, Jiwei ^{[1
,4
]}

Li, Yugang ^{[1
]}

Xiao, Hongyu ^{[1
]}

Li, Hongping ^{[2
]}

Sun, Huanhuan ^{[3
]}

Chen, Dong ^{[1
,4
]}

Wang, Mingliang ^{[1
]}

Wang, Haowei ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, Shanghai 200240, Peoples R China

[2] Shanghai Aircraft Design & Res Inst, Shanghai 201203, Peoples R China

[3] Shenyang Ligong Univ, Sch Mat Sci & Engn, Shenyang 110159, Peoples R China

[4] Anhui Prov Engn Res Ctr Aluminium Matrix Composit, Huaibei 235000, Peoples R China

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2021年 / 142卷

基金：

中国博士后科学基金;

关键词：

Particle-reinforced aluminium matrix composite; Microstructures; In-situ SEM; Fatigue crack initiation; X-ray microtomography; PARTICLE-SIZE; MECHANICAL-PROPERTIES; TIB2; PARTICLES; BEHAVIOR; AL; ALLOY; PROPAGATION; STRESS; DEFORMATION; TOMOGRAPHY;

D O I：

10.1016/j.ijfatigue.2020.105976

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

In this work, the fatigue initiation in a particle-reinforced aluminium matrix composite was investigated. The fatigue cracks mostly initiate at multiple sites associated with TiB2 and second phases (S/theta). Only few cracks initiate from individual TiB2, and they are caused by matrix fracture close to the high density dislocation zones around TiB2. Furthermore, the growth capability of initiated cracks is dependent on their stress intensity factors at crack tip. Only crack initated from largest-sized (S/theta + TiB2) cluster is developed into main crack. During main crack evolution, the small crack grows along slip traces and retarded by grain boundaries and/or TiB2.

引用

页数：13

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