Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 528, Issue 15, Pages 5283-5288Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2011.03.084
Keywords
Magnesium alloy; Die-casting; Microstructure evolution; Mechanical property; First-principle calculation
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Funding
- local governmental foundation [1071275-0-02]
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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.
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