Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 527, Issue 7-8, Pages 1891-1895Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2009.11.026
Keywords
Mg-Y-Nd-Zr-Gd alloys; Casting; Microstructure; Mechanical properties
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Funding
- National Natural Science Foundation of China [20921002]
- Science and Technology Program of Changchun [08YJ09]
- Program of Changchun Institute of Applied Chemistry
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Mg-5Y-3Nd-0.6Zr-xGd (x = 0, 2 and 4 wt.%) alloys were prepared by metal mould casting technique, the structures and mechanical properties were investigated. The alloys were mainly composed of alpha-Mg solid solution and beta-phase. With increasing Gd content, Mg(5)RE phase increased and the grain was refined. The Mg-5Y-3Nd-2Gd-0.6Zr alloy exhibited highest ultimate tensile strength and Mg-5Y-3Nd-0.6Zr alloy showed highest yield strength at room temperature. With increasing amount of Gd, the thermal resistance was improved. The Mg-5Y-3Nd-4Gd-0.6Zr alloy exhibited highest UTS and YS at 250 degrees C, they were about 1.27 times higher than those of Gd-free alloy, which was mainly attributed to the increase of the beta-phase and Mg(5)RE strengthening phase. (C) 2009 Elsevier B.V. All rights reserved.
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