期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2013.12.014
关键词
Squeeze casting; Magnesium alloy; AZ91-Ca; Microstructure; Mechanical property
类别
资金
- National Natural Science Foundation of China [51275295]
- SAST-SJTU Joint Research Centre of Advanced Aerospace Technology [USCAST2012-15]
- Research Fund for the Doctoral Program of Higher Education of China [20120073120011]
AZ91-(1-3 wt%) Ca alloys were prepared by direct squeeze casting, in which the melt was solidified under applied pressure. The effects of processing parameters (such as applied pressure and pouring temperature) and Ca content on microstructure and mechanical properties of squeeze casting A291-Ca alloys were investigated. The results indicate that the microstructure was refined with the increase of applied pressure, and the mechanical properties were improved. When the pouring temperature was lowered down to near the liquidus, the microstructure was further refined and alpha-Mg grains turned rosette-like. The negative effect on ambient temperature mechanical properties caused by the addition of Ca into AZ91 alloy was inhibited by squeeze casting. Compared to conventional casting, squeeze casting process can offer AZ91-Ca alloys better mechanical properties, especially in elongation to failure (Er). (C) 2013 Elsevier B.V. All rights reserved.
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