| Fracture toughness and fatigue crack growth characteristics of nanotwinned copper |
| A. Singh; L. Tang; M. Dao; L. Lu; S. Suresh
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| 2011
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| 发表期刊 | Acta Materialia
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| ISSN | 1359-6454
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| 卷号 | 59期号:6页码:2437-2446 |
| 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. |
| 部门归属 | [singh, a.; dao, m.; suresh, s.] mit, dept mat sci & engn, cambridge, ma 02139 usa. [tang, l.; lu, l.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china.;dao, m (reprint author), mit, dept mat sci & engn, cambridge, ma 02139 usa;mingdao@mit.edu llu@imr.ac.cn
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| 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
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| URL | 查看原文
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| WOS记录号 | WOS:000288568500018
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://ir.imr.ac.cn/handle/321006/30665
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| 专题 | 中国科学院金属研究所
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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.
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| 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.
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| MLA |
A. Singh,et al."Fracture toughness and fatigue crack growth characteristics of nanotwinned copper".Acta Materialia 59.6(2011):2437-2446.
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