Fatigue cracking at twin boundaries: Effects of crystallographic orientation and stacking fault energy

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	Fatigue cracking at twin boundaries: Effects of crystallographic orientation and stacking fault energy
	Z. J. Zhang; P. Zhang; L. L. Li; Z. F. Zhang
	2012
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	60 期号:6-7 页码:3113-3127
摘要	The combined effects of crystallographic orientation and stacking fault energy (SFE) on the cracking behaviors of twin boundaries (TB) under low-cycle fatigue (LCF) tests were studied in pure Cu, Cu-Al and Cu-Zn alloys. A new approach, called the slipping morphology method, based on the crystallographic characteristics of Sigma 3 TB in face-centered cubic materials, was developed to determine the grain orientations by studying the twin-slip morphology characteristics on the sample surfaces after LCF tests. Through analyzing the dislocation TB interaction and the damage this causes to TBs, a new parameter, defined as the difference of Schmid factors (DSF), was proposed to describe the effects of crystallographic orientation on the LCF cracking behaviors of TBs. A semi-quantitative relationship was established among DSF, SFE, dislocation slip mode and the critical conditions of TB cracking by systematically studying more than a hundred post-fatigue surface morphologies of pure Cu, Cu-Al and Cu-Zn alloys. It is interesting to find that the TB cracking relies strongly on the cooperation of both DSF and SFE. Furthermore, taking into account the interactions between slip dislocations and different boundaries, the fatigue cracking possibilities of several typical interfaces were compared and discussed. The results demonstrate that low-angle grain boundaries (GBs) are the strongest in resisting fatigue cracking, high-angle GBs are the weakest, and TBs are in between, which contributes the most to the final fatigue performance of materials. This new finding will help understanding of the interfacial properties under cyclic loading and may be beneficial to the design of high-performance materials with optimal fatigue properties in the future. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[zhang, z. j.; zhang, p.; li, l. l.; zhang, z. f.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china.;zhang, zf (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china.;zhfzhang@imr.ac.cn
关键词	Twin Boundaries Cu Alloy Fatigue Cracking Crystallographic Orientation Stacking Fault Energy Persistent Slip Bands Cyclic Deformation-behavior Strain-rate Sensitivity Centered-cubic Metals Fcc Solid-solutions Grain-boundaries Mechanical-properties Lattice Dislocations Nanotwinned Metals Ultrahigh Strength
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60476
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. J. Zhang,P. Zhang,L. L. Li,et al. Fatigue cracking at twin boundaries: Effects of crystallographic orientation and stacking fault energy[J]. Acta Materialia,2012,60(6-7):3113-3127.
APA	Z. J. Zhang,P. Zhang,L. L. Li,&Z. F. Zhang.(2012).Fatigue cracking at twin boundaries: Effects of crystallographic orientation and stacking fault energy.Acta Materialia,60(6-7),3113-3127.
MLA	Z. J. Zhang,et al."Fatigue cracking at twin boundaries: Effects of crystallographic orientation and stacking fault energy".Acta Materialia 60.6-7(2012):3113-3127.