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Excellent creep properties of Mg–Zn–Cu–Gd-based alloy strengthened by quasicrystals and Laves phases

Published online by Cambridge University Press:  01 May 2005

Guangyin Yuan ,
Hidemi Kato ,
Kenji Amiya  and
Akihisa Inoue
Guangyin Yuan*
Affiliation:
School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, People’s Republic of China; and Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Hidemi Kato
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Kenji Amiya
Affiliation:
Inoue Superliquid Glass Project, ERATO, Japan Science and Technology Corporation,Sendai 982-0807, Japan
Akihisa Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

A new type of Mg–Zn–Cu–Gd-based alloy strengthened by quasicrystal and Laves phase was developed. This alloy exhibits much better creep properties compared to AE42(Mg–4 wt% Al–2 wt% rare-earth) alloy, which is the benchmark creep-resistant magnesium die-casting alloy under the compressive creep condition of 180 °C and80 MPa. The new alloy also exhibits high room-temperature mechanical properties close to that of AZ91 alloy. The good mechanical properties are attributed to the special microstructure; the thermally stable icosahedral quasicrystals phase (i-phase) and Laves phase distributed along the grain boundary as a hard skeleton, and some fine β′1 precipitates distributed homogenously on the matrix. The dislocation morphology after the creep test was studied, and the strengthening mechanism was proposed.

Keywords

Mechanical propertiesMicrostructureQuasicrystal
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 5 , May 2005 , pp. 1278 - 1286
Copyright
Copyright © Materials Research Society 2005

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