Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys

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	Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys
	D. K. Xu; E. H. Han; L. Liu; Y. B. Xu
	2009
发表期刊	Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science
ISSN	1073-5623
卷号	40A 期号:7 页码:1727-1740
摘要	This work mainly investigated the microstructure and mechanical properties of Mg-Zn-Y-Zr alloys with Zn/Y ratios of 5 and 10. An X-ray diffraction (XRD) analysis indicated that the two alloys were mainly composed of an icosahedral phase (I-phase) and alpha-Mg matrix. For the alloy with a Zn/Y ratio of 10, however, the diffraction peaks of the I-phase were stronger. Microstructure observation showed that the I-phase preferentially existed in the form of I-phase/alpha-Mg matrix interdendritic eutectic pockets at grain boundaries. Moreover, when the Zn/Y ratio was increased 2 times, the volume fraction of the I-phase in the alpha-Mg matrix increased 1.5 times and a tiny Mg(7)Zn(3) phase formed. Energy-dispersive spectroscopy (EDS) mapping and electron probe microanalysis (EPMA) results suggested that the chemical composition of the I-phase was not a constant value. Computer-aided cooling curve analysis (CA-CCA) indicated that, for the alloy with a Zn/Y ratio of 5, formation of the I-phase relied on the W-phase transformation and the eutectic reaction of the residual melt. However, the I-phase formation for the alloy with a Zn/Y ratio of 10 depended on the eutectic reaction of the melt. Tensile tests indicated that the mechanical properties of the two as-cast alloys were poor. After hot extrusion processing, the mechanical properties of the alloy with a Zn/Y ratio of 10 were noticeably increased. The ultimate tensile strength (UTS) and elongation to failure reached 320 MPa and 13 pct, respectively.
部门归属	[han, en-hou] chinese acad sci, lab corros & protect, inst met res, shenyang 110016, peoples r china. [liu, l.; xu, y. b.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [xu, d. k.] chinese acad sci, inst met res, beijing 100864, peoples r china.;han, eh (reprint author), chinese acad sci, lab corros & protect, inst met res, 62 wencui rd, shenyang 110016, peoples r china;ehhan@imr.ac.cn
关键词	Metal-matrix Composites Quasi-crystalline Particles Icosahedral Phase Strengthening Mechanisms Solidification Behavior Magnesium Fatigue Diagram Systems
URL	查看原文
WOS记录号	WOS:000267108200027
引用统计	被引频次：49[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32456
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	D. K. Xu,E. H. Han,L. Liu,et al. Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys[J]. Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,2009,40A(7):1727-1740.
APA	D. K. Xu,E. H. Han,L. Liu,&Y. B. Xu.(2009).Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys.Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science,40A(7),1727-1740.
MLA	D. K. Xu,et al."Influence of Higher Zn/Y Ratio on the Microstructure and Mechanical Properties of Mg-Zn-Y-Zr Alloys".Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science 40A.7(2009):1727-1740.