EFFECT OF TWIN LAMELLAR THICKNESS ON THE FATIGUE PROPERTIES OF NANO-TWINNED Cu
文献类型：期刊论文
| 作者 | Tang Lian; Lu Lei |
| 刊名 | ACTA METALLURGICA SINICA
 |
| 出版日期 | 2009-07-01 |
| 卷号 | 45期号:7页码:808-814 |
| 关键词 | Cu twin boundary fatigue crack fatigue endurance limit slip band shear band |
| ISSN号 | 0412-1961 |
| 通讯作者 | Lu Lei(llu@imr.ac.cn) |
| 英文摘要 | The fatigue property of metals is one of the most important concerns in industrial design. It is affected by various factors, such as the microstructure, mechanics and the environment. For the polycrystalline metallic materials, grain boundaries (GBs) usually play an important role and affect the fatigue behaviors significantly. GBs could strengthen materials by blocking the motion of dislocations; meanwhile, the stress concentration which is caused by the dislocations pile-up in the vicinity of GBs would result in the initial fatigue crack easily. As a special interface of low-energy, twin boundaries (TBs) can strengthen materials by blocking the motion of dislocations in a manner similar to that of GBs. Our studies have indicated that a high density of nano-scale twin lamellae can provide the high strength without significantly compromising ductility., which is fundamentally different from that of GB strengthening. So far, most studies of the TB-related fatigue and cracking behaviors are concentrated on the twins with a thickness of few or tens micrometers. The study of the TB-related fatigue behavior in nanometer scale is rare. In this work, high-purity Cu specimens with high density of nano-scale coherent TBs were synthesized by means of the pulsed electro-deposition (PED). The twin lamellar thickness dependence of fatigue life and fatigue endurance limit of the nano-twinned Cu (nt-Cu) were studied by conducting tension-tension fatigue tests under constant stress amplitude control at room temperature. It is found that both the fatigue life and fatigue endurance limit increase with the decrease of the twin lamellar thickness. Postmortem SEM observations suggest a transition in crack initiation site from shear bands (SBs) to TBs, when the twin lamellar thickness is reduced from 85 to 32 nm. For the nt-Cu samples with thick twin lamellae, the lattices accommodate the plastic strain, which results in the SB cracking. For the nt-Cu samples with thin twin lamellae, the abundant TBs accommodate the plastic strain. The stress concentration along TBs which is caused by the interactions of dislocation-TBs facilitates the fatigue cracking along TBs. |
| WOS研究方向 | Metallurgy & Metallurgical Engineering |
| 语种 | 英语 |
| WOS记录号 | WOS:000269377300005 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.imr.ac.cn/handle/321006/98029]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 通讯作者 | Lu Lei |
| 作者单位 | Chinese Acad Sci, Shenyang Natl Lab Mat Sci, Inst Met Res, Shenyang 110016, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tang Lian,Lu Lei. EFFECT OF TWIN LAMELLAR THICKNESS ON THE FATIGUE PROPERTIES OF NANO-TWINNED Cu[J]. ACTA METALLURGICA SINICA,2009,45(7):808-814. |
| APA | Tang Lian,&Lu Lei.(2009).EFFECT OF TWIN LAMELLAR THICKNESS ON THE FATIGUE PROPERTIES OF NANO-TWINNED Cu.ACTA METALLURGICA SINICA,45(7),808-814. |
| MLA | Tang Lian,et al."EFFECT OF TWIN LAMELLAR THICKNESS ON THE FATIGUE PROPERTIES OF NANO-TWINNED Cu".ACTA METALLURGICA SINICA 45.7(2009):808-814. |
入库方式： OAI收割
来源：金属研究所
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