Microstructure and strengthening mechanisms of a cast Mg-1.48Gd-1.13Y-0.16Zr (at.%) alloy

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	Microstructure and strengthening mechanisms of a cast Mg-1.48Gd-1.13Y-0.16Zr (at.%) alloy
	L. Gao; R. S. Chen; E. H. Han
	2009
发表期刊	Journal of Materials Science
ISSN	0022-2461
卷号	44 期号:16 页码:4443-4454
摘要	The microstructure and mechanical properties of a Mg-1.48Gd-1.13Y-0.16Zr (at.%) alloy in the as-cast, solution-treated, peak-aged and over-aged conditions have been investigated by a combination of thermodynamic calculations and experimental approaches. It is shown that both the Mg(24)(Gd,Y)(5) and cuboid-shaped Mg(5)(Gd,Y) phases exist in the as-cast sample, which is in good agreement with the Scheil solidification model. The former is dissolved during solution treatment, while the latter persists and coarsens. Subsequent artificial ageing results in the formation of metastable beta' precipitates within the alpha-Mg matrix and along the grain boundaries. The peak-aged alloy exhibits maximum ultimate tensile strength and tensile yield strength of 370 and 277 MPa, respectively, at room temperature. Moreover, the strengths decrease gently from room temperature to 250 A degrees C with a gradual increase of elongation. The strengthening contributions to the yield strength are quantitatively evaluated from individual strengthening mechanisms by using measured microstructural parameters. The modelled yield strengths are compared with the experimental results and a reasonable agreement is reached.
部门归属	[gao, l.; chen, r. s.; han, e. h.] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. [gao, l.] chinese acad sci, grad sch, beijing, peoples r china.;chen, rs (reprint author), chinese acad sci, inst met res, state key lab corros & protect, 62 wencui rd, shenyang 110016, peoples r china;rongshichen@yahoo.com
关键词	Y-zr Alloys Mg-y Wt.percent Alloy Precipitation 250-degrees-c Behavior System Al
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WOS记录号	WOS:000267784300034
引用统计	被引频次：87[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/321006/31919
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	L. Gao,R. S. Chen,E. H. Han. Microstructure and strengthening mechanisms of a cast Mg-1.48Gd-1.13Y-0.16Zr (at.%) alloy[J]. Journal of Materials Science,2009,44(16):4443-4454.
APA	L. Gao,R. S. Chen,&E. H. Han.(2009).Microstructure and strengthening mechanisms of a cast Mg-1.48Gd-1.13Y-0.16Zr (at.%) alloy.Journal of Materials Science,44(16),4443-4454.
MLA	L. Gao,et al."Microstructure and strengthening mechanisms of a cast Mg-1.48Gd-1.13Y-0.16Zr (at.%) alloy".Journal of Materials Science 44.16(2009):4443-4454.