Effects of inclusions, grain boundaries and grain orientations on the fatigue crack initiation and propagation behavior of 2524-T3 Al alloy

被引：157

作者：

Chen, Y. Q. ^{[1
]}

Pan, S. P. ^{[1
]}

Zhou, M. Z. ^{[2
]}

Yi, D. Q. ^{[1
]}

Xu, D. Z. ^{[3
]}

Xu, Y. F. ^{[4
]}

机构：

[1] Cent South Univ, Sch Mat Sci & Engn, Changsha 410083, Peoples R China

[2] Bichamp Cutting Technol Co Ltd, Wangcheng Econ Dev Area, Changsha 410200, Hunan, Peoples R China

[3] IIT, Thermal Proc Technol Ctr, Chicago, IL 60616 USA

[4] Xiangtan Univ, Sch Mech Engn, Xiangtan 411105, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2013年 / 580卷

基金：

中国国家自然科学基金;

关键词：

Aluminum alloys; In-situ observation; Microstructure; Fatigue crack behavior; IN-SITU OBSERVATION; FRACTURE-BEHAVIOR; SEM OBSERVATIONS; GROWTH; MICROSTRUCTURE; PHASE; PRECIPITATION; MECHANISMS; STRESS; STAGE;

D O I：

10.1016/j.msea.2013.05.053

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Microstructural aspects have fundamental influences on the fatigue crack characteristics of materials. In this paper, effects of inclusions, grain boundaries (GBs) and grain orientations on the fatigue crack initiation and propagation behavior in a 2524-T3 aluminum alloy have been investigated using in-situ scanning electron microscope (SEM) fatigue testing and electron back scattering diffraction (EBSD). The results show that, potential fatigue cracks tend to nucleate along coarse and closely spaced inclusion particles or high-angle GBs. Coarse inclusion particles drastically accelerate local crack growth rates. A model of series crack growing stages is given based on the observation of initiation and growth of cracks at the inclusion region. GBs serve to impede the crack tip from propagation and cause large angle crack deflections, which greatly affects local crack propagation behaviors. In addition, fatigue crack shows a strong tendency to propagate transgranularly grains with high Schmid factors (SFs) and avoid grains with low SFs. (C) 2013 Elsevier BM. All rights reserved.

引用

页码：150 / 158

页数：9

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