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Microstructure and compressive properties of chill-cast Mg–Al–Ca alloys

Published online by Cambridge University Press:  01 March 2006

Ling-Ling Shi ,
Han Ma ,
Teng Liu ,
Jian Xu  and
En Ma
Ling-Ling Shi
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Han Ma
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Teng Liu
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Jian Xu
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
En Ma*
Affiliation:
Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, Maryland 21218
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Mg82Al8Ca10 was determined to be a pseudo-binary eutectic composition [liquid solidifying into α–Mg and (Mg,Al)2Ca in the Mg–Al–Ca ternary system with a eutectic melting temperature of 789 K]. A series of Mgx(Al0.44Ca0.56)100−x alloys, where 75 ≤ x ≤ 95, were cast into Φ4 mm rods using copper mold casting. The eutectic alloy exhibits the highest fracture strength, σf = 609 MPa. For 75 ≤ x ≥ 79, the alloys have hypereutectic microstructures with Mg2Ca as the primary phase, and σf is reduced together with diminishing plasticity. For hypoeutectic alloys with 86 ≤ x ≥ 95, the volume fraction of the primary α–Mg dendrites dispersed in the eutectic matrix increases with increasing x, resulting in a gradual decrease of the yield and fracture strengths but improved plastic strain to as large as 9%. The refined microstructures created in bulk samples via chill casting can lead to a good combination of strength and plasticity, with specific strength superior to commercial Mg alloys.

Keywords

AlloyMgMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 3 , March 2006 , pp. 613 - 622
Copyright
Copyright © Materials Research Society 2006

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