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

被引：25

作者：

Lin, L. ^{[1
]}

Wang, F. ^{[1
]}

Yang, L. ^{[1
]}

Chen, L. J. ^{[1
]}

Liu, Z. ^{[1
]}

Wang, Y. M. ^{[2
]}

机构：

[1] Shenyang Univ Technol, Sch Mat Sci & Engn, Shenyang 110870, Peoples R China

[2] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 15期

关键词：

Magnesium alloy; Die-casting; Microstructure evolution; Mechanical property; First-principle calculation; MECHANICAL-PROPERTIES; MG; ENERGY; CREEP;

D O I：

10.1016/j.msea.2011.03.084

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

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% Al2Ca phase will precipitate during solidification, no Mg2Ca 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 Al2Ca phase, which considerably refined the bulky beta-Mg17Al12 phase distributed originally at the grain boundaries of die-cast AZ91 alloy with no Ca addition. The priority of Al2Ca phase compared to Mg2Ca 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.

引用

页码：5283 / 5288

页数：6

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