Low cycle fatigue properties of friction stir welded joints of a semi-solid processed AZ91D magnesium alloy

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	Low cycle fatigue properties of friction stir welded joints of a semi-solid processed AZ91D magnesium alloy
	D. R. Ni; D. L. Chen; J. Yang; Z. Y. Ma
	2014
发表期刊	Materials & Design
ISSN	0261-3069
卷号	56 页码:1-8
摘要	A semi-solid processed (thixomolded) Mg-9Al-1Zn magnesium alloy (AZ91D) was subjected to friction stir welding (FSW), aiming at evaluating the weldability and fatigue property of the FSW joint. Microstructure analysis showed that a recystallized fine-grained microstructure was generated in the nugget zone (NZ) after FSW. The yield strength, ultimate tensile strength, and elongation of the FSW joint were obtained to be 192 MPa, 245 MPa, and 7.6%, respectively. Low-cycle fatigue tests showed that the FSW joint had a fatigue life fairly close to that of the BM, which could be well described by the Basquin and Coffin-Manson equations. Unlike the extruded magnesium alloys, the hysteresis loops of FSW joint of the thixomolded AZ91D alloy were basically symmetrical, while the non-linear or pseudoelastic behavior was still present. The FSW joint was observed to fail in the BM section rather than in the NZ. Fatigue crack initiated basically from the pores at or near the specimen surface, and crack propagation was mainly characterized by fatigue striations along with the presence of secondary cracks. (C) 2013 Elsevier Ltd. All rights reserved.
部门归属	[ni, d. r. ; chen, d. l.] ryerson univ, dept mech & ind engn, toronto, on m5b 2k3, canada. [ni, d. r. ; yang, j. ; ma, z. y.] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china. ; chen, dl (reprint author), ryerson univ, dept mech & ind engn, 350 victoria st, toronto, on m5b 2k3, canada. ; dchen@ryerson.ca ; zyma@imr.ac.cn
关键词	Magnesium Alloy Thixomolding Friction Stir Welding Low Cycle Fatigue Cyclic Deformation Die-cast Magnesium Mechanical-properties Deformation-behavior Aluminum-alloy Rare-earth Microstructure Strain Evolution Mg Parameters
URL	查看原文
语种	英语
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/72566
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	D. R. Ni,D. L. Chen,J. Yang,et al. Low cycle fatigue properties of friction stir welded joints of a semi-solid processed AZ91D magnesium alloy[J]. Materials & Design,2014,56:1-8.
APA	D. R. Ni,D. L. Chen,J. Yang,&Z. Y. Ma.(2014).Low cycle fatigue properties of friction stir welded joints of a semi-solid processed AZ91D magnesium alloy.Materials & Design,56,1-8.
MLA	D. R. Ni,et al."Low cycle fatigue properties of friction stir welded joints of a semi-solid processed AZ91D magnesium alloy".Materials & Design 56(2014):1-8.