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Effects of rare earth on the structure and properties of Mg–6Zn–5Al–4Gd–1RE (RE = Ce or Y) alloys

Published online by Cambridge University Press:  31 January 2011

Wenlong Xiao ,
Shusheng Jia ,
Jianli Wang ,
Jie Yang ,
Lidong Wang  and
Limin Wang
Wenlong Xiao
Affiliation:
Key Laboratory of Automobile Materials, Ministry of Education, Jilin University, Changchun 130025, China; and State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (CAS), Changchun 130022, China
Shusheng Jia
Affiliation:
Key Laboratory of Automobile Materials, Ministry of Education, Jilin University, Changchun 130025, China
Jianli Wang*
Affiliation:
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (CAS), Changchun 130022, China; and Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
Jie Yang
Affiliation:
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (CAS), Changchun 130022, China; and Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
Lidong Wang
Affiliation:
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (CAS), Changchun 130022, China
Limin Wang
Affiliation:
State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (CAS), Changchun 130022, China
*
a)Address all correspondence to this author. e-mail: lmwang@ciac.jl.cn
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Abstract

The microstructures and mechanical properties of Mg–6Zn–5Al–4Gd–1RE (RE = Ce or Y) alloys were investigated. The addition of Ce or Y obviously refines the grain size for the Mg–6Zn–5Al–4Gd-based alloy, while the Y element has a better refining effect. The Ce and Y show different grain-refining mechanisms: Ce addition mostly promotes the growth of secondary dendrite, while Y addition mainly increases the heterogeneous nucleation sites. The hardness-versus-aging time curves indicate that all the alloys have excellent aging-hardening behavior, but the response to maximum hardness was delayed by the Ce or Y addition. The microstructure observation of the peak-aged alloys indicated a large number of nanocrystalline τ-Mg32(Al, Zn)49 precipitates in the matrix. The Y addition is beneficial to improve the mechanical properties, and the alloy has optimal values. However, the Ce addition decreases the ultimate tensile strength and elongation of the alloy due to formation of a lot of shrinkage porosities.

Keywords

MgMicrostructureStrength
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 10 , October 2008 , pp. 2609 - 2621
Copyright
Copyright © Materials Research Society 2008

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