Abstract
The as-cast microstructure of Mg-5 Al-3Ca-xY alloy consists of dendritic a-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 nave more ettect to improve mechanical properties.
Original language | English |
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Pages (from-to) | 945-951 |
Number of pages | 7 |
Journal | Materials Transactions |
Volume | 49 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2008 May |
Keywords
- Casting
- Extrusion
- Magnesium-aluminum-calcium alloys
- Rare earth element
- Yttrium (Y)
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering