Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
The Effects of Yttrium Element on Microstructure and Mechanical Properties of Mg-5 mass%Al-3 mass%Ca Based Alloys Fabricated by Gravity Casting and Extrusion Process
Hyeon-Taek SonJae-Seol LeeChang-Seog KangJung-Chan BaeKyosuke YoshimiKouichi Maruyama
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2008 Volume 49 Issue 5 Pages 945-951


The as-cast microstructure of Mg-5Al-3Ca-xY alloy consists of dendritic α-Mg matrix, (Mg, Al)2Ca eutectic phase and Al2Y intermetallic compounds. These two kind of (Mg, Al)2Ca compounds were observed: coarse irregular-shape structure at grain boundary and fine needle-shape structure in the α-Mg matrix grain. This (Mg, Al)2Ca phase of the extruded alloys was elongated to extrusion direction and size of this phase was refined comparing with that of as-cast alloys because of severe deformation during hot extrusion. Maximum yield and ultimate strength value of extruded alloys was 326 and 331 MPa at Mg-5Al-3Ca-3Y alloy, respectively. From these results, it is conclusively demonstrated that Y additions on Mg-5Al-3Ca alloy have more effect to improve mechanical properties.

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© 2008 The Japan Institute of Metals and Materials
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