The microstructures and mechanical properties of cast Mg-Zn-Al-RE alloys

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作者：
Xiao, Wenlong [1 ,2 ]
Jia, Shusheng [1 ]
Wang, Lidong [2 ]
Wu, Yaoming [2 ]
Wang, Limin [2 ]
机构：
[1] Key Laboratory of Automobile Materials, Ministry of Education, Department of Materials Science and Engineering, Changchun, 130025, China
[2] State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, CAS, Changchun, 130022, China
来源：
Journal of Alloys and Compounds | 2009年 / 480卷 / 02期
关键词：
The microstructures and mechanical properties of cast Mg-Zn-Al-RE alloys with 4 wt.% RE and variable Zn and Al contents were investigated. The results show that the alloys mainly consist of α-Mg; Al2REZn2; Al4RE and τ-Mg32(Al; Zn)49; phases; and a little amount of the β-Mg17Al12 phase will also be formed with certain Zn and Al contents. When increasing the Zn or Al content; the distribution of the Al2REZn2 and Al4RE phases will be changed from cluster to dispersed; and the content of τ-Mg32(Al; Zn)49 phase increased gradually. The distribution of the Al2REZn2 and Al4RE phases; and the content of β- or τ-phase are critical to the mechanical properties of Mg-Zn-Al-RE alloys. The Mg-6Zn-5Al-4RE alloy with cluster Al2REZn2 phase and low content of β-phase; exhibits the optimal mechanical properties; and the ultimate tensile strength; yield strength and elongation are 242 MPa; 140 MPa and 6.4% at room temperature; respectively. © 2009 Elsevier B.V. All rights reserved;
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