Enhanced cyclic deformation responses of ultrafine-grained Cu and nanocrystalline Cu-Al alloys

IMR OpenIR

	Enhanced cyclic deformation responses of ultrafine-grained Cu and nanocrystalline Cu-Al alloys
	X. H. An; S. D. Wu; Z. G. Wang; Z. F. Zhang
	2014
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	74 页码:200-214
摘要	Cyclic deformation responses of ultrafine-grained (UFG) Cu and nanocrystalline (NC) Cu Al alloys produced by equal channel angular pressing were investigated systematically by applying low-cycle fatigue (LCF) and high-cycle fatigue (HCF) tests. Based on the dependence of the fatigue life (N-f) on the total strain amplitude (Delta epsilon(t)/2) and stress amplitude (Delta sigma/2) in comparison with that of UFG Cu, the LCF life and HCF strength, especially fatigue endurance limits, of NC Cu Al alloys, were enhanced strikingly at the same time as their stacking fault energies (SFE) decreased. These upgraded fatigue performances with lowering of the SFE in NC Cu Al alloys can be attributed not only to the simultaneous increase in their monotonic strength and ductility on the macroscale, but also to the crucially decreased cyclic softening behavior on the microscale. It was found that substantial grain growth and large-scale shear bands, both of which are essential ingredients, resulting in significant cyclic softening and then deterioration in the LCF life of UFG and NC materials, were reduced advantageously on decreasing the SFE in NC Cu-Al alloys. Moreover, the dominant fatigue damage micro-mechanism was also transformed inherently from extensive grain boundary (GB) migration in UFG Cu to other local GB activities such as atom shuffling or GB sliding/rotation in NC Cu Al alloy with low SFE. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
部门归属	[an, x. h. ; wu, s. d. ; wang, z. g. ; zhang, z. f.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; an, xh (reprint author), chinese acad sci, inst met res, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china. ; anxianghai@gmail.com ; zhfzhang@imr.ac.cn
关键词	Ultrafine-grained Cu Nanocrystalline Cu-al Alloys Stacking Fault Energy Cyclic Softening Fatigue Damage Mechanism Severe Plastic-deformation Stacking-fault Energy Crack Growth Resistance Stress-strain Response High-pressure Torsion Microstructural Evolution Fatigue Behavior Mechanical-properties Nanostructured Cu Copper
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73186
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. H. An,S. D. Wu,Z. G. Wang,et al. Enhanced cyclic deformation responses of ultrafine-grained Cu and nanocrystalline Cu-Al alloys[J]. Acta Materialia,2014,74:200-214.
APA	X. H. An,S. D. Wu,Z. G. Wang,&Z. F. Zhang.(2014).Enhanced cyclic deformation responses of ultrafine-grained Cu and nanocrystalline Cu-Al alloys.Acta Materialia,74,200-214.
MLA	X. H. An,et al."Enhanced cyclic deformation responses of ultrafine-grained Cu and nanocrystalline Cu-Al alloys".Acta Materialia 74(2014):200-214.