Fracture toughness and fatigue crack growth characteristics of nanotwinned copper

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	Fracture toughness and fatigue crack growth characteristics of nanotwinned copper
	A. Singh ; L. Tang ; M. Dao ; L. Lu ; S. Suresh
刊名	Acta Materialia
	2011
卷号	59 期号:6 页码:2437-2446
关键词	Nanotwins Fracture toughness Fatigue crack growth Damage tolerance Nanocrystalline copper strain-rate sensitivity nanocrystalline metals mechanical-behavior opening displacement grain-size nickel deformation nanoscale strength twins
ISSN号	1359-6454
中文摘要	Recent studies have shown that nano twinned copper (NT Cu) exhibits a combination of high strength and moderate ductility. However, most engineering and structural applications would also require materials to have superior fracture toughness and prolonged subcritical fatigue crack growth life. The current study investigates the effect of twin density on the crack initiation toughness and stable fatigue crack propagation characteristics of NT Cu. Specifically, we examine the effects of tailored density of nanotwins, incorporated into a fixed grain size of ultrafine-grained (UFG) copper with an average grain size of 450 nm, on the onset and progression of subcritical fracture under quasi-static and cyclic loading at room temperature. We show here that processing-induced, initially coherent nanoscale twins in UFG copper lead to a noticeable improvement in damage tolerance under conditions of plane stress. This work strongly suggests that an increase in twin density, at a fixed grain size, is beneficial not only for desirable combinations of strength and ductility but also for enhancing damage tolerance characteristics such as fracture toughness, threshold stress intensity factor range for fatigue fracture and subcritical fatigue crack growth life. Possible mechanistic origins of these trends are discussed, along with issues and challenges in the study of damage tolerance in NT Cu. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
原文出处	://WOS:000288568500018
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/30665]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	A. Singh,L. Tang,M. Dao,et al. Fracture toughness and fatigue crack growth characteristics of nanotwinned copper[J]. Acta Materialia,2011,59(6):2437-2446.
APA	A. Singh,L. Tang,M. Dao,L. Lu,&S. Suresh.(2011).Fracture toughness and fatigue crack growth characteristics of nanotwinned copper.Acta Materialia,59(6),2437-2446.
MLA	A. Singh,et al."Fracture toughness and fatigue crack growth characteristics of nanotwinned copper".Acta Materialia 59.6(2011):2437-2446.