Microstructure investigation and first-principle analysis of die-cast AZ91 alloy with calcium addition

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	Microstructure investigation and first-principle analysis of die-cast AZ91 alloy with calcium addition
	L. Lin ; F. Wang ; L. Yang ; L. J. Chen ; Z. Liu ; Y. M. Wang
刊名	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
	2011
卷号	528 期号:15 页码:5283-5288
关键词	Magnesium alloy Die-casting Microstructure evolution Mechanical property First-principle calculation mechanical-properties phase-equilibria al alloys mg energy creep
ISSN号	0921-5093
中文摘要	In order to get improved mechanical properties of die-cast AZ91 alloy under elevated temperatures. Ca element was added as a cost-effective alloying constituent. It appeared that minor Ca addition less than 0.5 wt% would result in no apparent change in microstructure, but the tensile strength at elevated temperatures was improved considerably. When increasing Ca addition to more than 1.0 wt% Al(2)Ca phase will precipitate during solidification, no Mg(2)Ca phase was discovered. Homogeneous microstructure and high temperature stability in tensile strength of die-cast AZ91 alloy with Ca addition was mainly attributed to the precipitation of Al(2)Ca phase, which considerably refined the bulky beta-Mg(17)Al(12) phase distributed originally at the grain boundaries of die-cast AZ91 alloy with no Ca addition. The priority of Al(2)Ca phase compared to Mg(2)Ca phase in precipitation sequence was verified by first-principle calculation of their cohesive energy and formation enthalpy, and can also be associated with more bounding electrons between Al and Ca atoms. (C) 2011 Elsevier B.V. All rights reserved.
原文出处	://WOS:000291125900056
公开日期	2012-04-13
内容类型	期刊论文
源URL	[http://210.72.142.130/handle/321006/30502]
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	L. Lin,F. Wang,L. Yang,et al. Microstructure investigation and first-principle analysis of die-cast AZ91 alloy with calcium addition[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2011,528(15):5283-5288.
APA	L. Lin,F. Wang,L. Yang,L. J. Chen,Z. Liu,&Y. M. Wang.(2011).Microstructure investigation and first-principle analysis of die-cast AZ91 alloy with calcium addition.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,528(15),5283-5288.
MLA	L. Lin,et al."Microstructure investigation and first-principle analysis of die-cast AZ91 alloy with calcium addition".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 528.15(2011):5283-5288.