Low-cycle fatigue properties of a titanium alloy exhibiting nonlinear elastic deformation behavior

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	Low-cycle fatigue properties of a titanium alloy exhibiting nonlinear elastic deformation behavior
	S. Q. Zhang ; S. J. Li ; M. T. Jia ; F. Prima ; L. J. Chen ; Y. L. Hao ; R. Yang
刊名	Acta Materialia
	2011
卷号	59 期号:11 页码:4690-4699
关键词	Elastic deformation Low-cycle fatigue Elastic asymmetry Stress-induced phase transformation ti-nb alloys biomedical applications plastic-deformation alpha'' martensite youngs modulus superelasticity zr competition mechanism omega
ISSN号	1359-6454
中文摘要	Strain-controlled low-cycle fatigue (LCF) behavior of a metastable beta-type titanium alloy Ti-24Nb-4Zr-8Sn (wt.%, termed Ti2448) was investigated at room temperature under different cycle strains. The results showed that the alloy possesses good LCF resistance because applied total cycle strains up to 4.5% are endured mainly by the recoverable elastic strain. The study also revealed a dependence of the elastic deformation behavior on the loading condition: nonlinear elasticity with large recoverable strains in uniaxial tension but almost linear elasticity with higher elastic modulus and lower recoverable strain in uniaxial compression. The above elastic asymmetry explains the facts that both fatigue life in LCF and fatigue strength in high-cycle fatigue are worse in tension compression cycles than in tension tension cycles. Microstructure analyses of these fatigue-tested specimens showed that the beta phase is elastically stable at cycle stresses up to similar to 400 MPa whereas further increasing the applied cycle stress and strain results in small amounts of the omega phase and the alpha '' martensite. These two stress-induced phase transformations are competing and exclude each other across a wide range of cycle stress. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
原文出处	://WOS:000291567900042
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/30913]
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. Q. Zhang,S. J. Li,M. T. Jia,et al. Low-cycle fatigue properties of a titanium alloy exhibiting nonlinear elastic deformation behavior[J]. Acta Materialia,2011,59(11):4690-4699.
APA	S. Q. Zhang.,S. J. Li.,M. T. Jia.,F. Prima.,L. J. Chen.,...&R. Yang.(2011).Low-cycle fatigue properties of a titanium alloy exhibiting nonlinear elastic deformation behavior.Acta Materialia,59(11),4690-4699.
MLA	S. Q. Zhang,et al."Low-cycle fatigue properties of a titanium alloy exhibiting nonlinear elastic deformation behavior".Acta Materialia 59.11(2011):4690-4699.