Compression fatigue behavior of Ti-6Al-4V mesh arrays fabricated by electron beam melting

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	Compression fatigue behavior of Ti-6Al-4V mesh arrays fabricated by electron beam melting
	S. J. Li; L. E. Murr; X. Y. Cheng; Z. B. Zhang; Y. L. Hao; R. Yang; F. Medina; R. B. Wicker
	2012
发表期刊	Acta Materialia
ISSN	1359-6454
卷号	60 期号:3 页码:793-802
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.
部门归属	[li, s. j.; cheng, x. y.; zhang, z. b.; hao, y. l.; yang, r.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [murr, l. e.] univ texas el paso, dept met & mat engn, el paso, tx 79968 usa. [murr, l. e.; medina, f.; wicker, r. b.] univ texas el paso, wm keck ctr innovat 3d, el paso, tx 79968 usa.;hao, yl (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china.;ylhao@imr.ac.cn
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
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60064
专题	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.