Compression fatigue behavior of Ti-6Al-4V mesh arrays fabricated by electron beam melting
文献类型：期刊论文
| 作者 | S. J. Li ; L. E. Murr ; X. Y. Cheng ; Z. B. Zhang ; Y. L. Hao ; R. Yang ; F. Medina ; R. B. Wicker |
| 刊名 | Acta Materialia
 |
| 出版日期 | 2012 |
| 卷号 | 60期号:3页码:793-802 |
| 关键词 | Electron beam melting Titanium alloys Mesh arrays Fatigue cyclic creep acceleration aluminum-alloy foams ambient-temperature crack propagation single-crystals cellular metals heat-treatment stress copper mechanisms |
| ISSN号 | 1359-6454 |
| 中文摘要 | This paper focuses on the compression fatigue behavior of Ti-6Al-4V mesh arrays with high porosities of similar to 60-85%, which were fabricated by an additive manufacturing technique using electron beam melting. The results show that their fatigue lives are mainly determined by uniform deformation through the entire specimens, while their failures are characterized by rapid strain accumulation and a severe crush band at an angle of 45 degrees to the cyclic loading direction. The relation between the relative fatigue strength and relative density can be evaluated by the well-known Gibson-Ashby model with the exponential factor n being 2.7, which is higher than the reported data for aluminum and nickel foams, and almost double the idealized value (n = 1.5) of a stochastic open cellular foam. The underlying mechanism of fatigue failure appears to be interaction between cyclic ratcheting and fatigue crack initiation and propagation, while the former plays a dominant role in fatigue life. TEM observations found that dislocations are generated along the interface of the alpha' phase and their generation becomes more evident with an increase in the relative density. This would contribute to the retardation of cyclic ratcheting and an improvement in the fatigue strength. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| 原文出处 | |
| 公开日期 | 2013-02-05 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/60064]  |
| 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 | S. J. Li,L. E. Murr,X. Y. Cheng,et al. Compression fatigue behavior of Ti-6Al-4V mesh arrays fabricated by electron beam melting[J]. Acta Materialia,2012,60(3):793-802. |
| APA | S. J. Li.,L. E. Murr.,X. Y. Cheng.,Z. B. Zhang.,Y. L. Hao.,...&R. B. Wicker.(2012).Compression fatigue behavior of Ti-6Al-4V mesh arrays fabricated by electron beam melting.Acta Materialia,60(3),793-802. |
| MLA | S. J. Li,et al."Compression fatigue behavior of Ti-6Al-4V mesh arrays fabricated by electron beam melting".Acta Materialia 60.3(2012):793-802. |
入库方式： OAI收割
来源：金属研究所
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