期刊
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
卷 528, 期 4-5, 页码 2174-2179出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2010.11.063
关键词
Mg-Li-Al-Zn-RE alloys; Heat treatment; Microstructure; Tensile properties
类别
资金
- National Natural Science Foundation of China [51001034]
- Key Project of Science and Technology of Harbin City [2008AA4CH044, 2009AA1AG065, 2010AA4BE031]
- Fundamental Research funds for the Central Universities [HEUCF101001]
- Research Fund for the Doctoral Program of Higher Education [20092304120020]
- Project of Science and Technology of Heilongjian Province Education Department [11553054]
As-cast Mg-5Li-3Al-2Zn-xRE (x=0-2.5 wt.%) alloys were prepared under the ambient of pure argon, and the effects of Ce-rich rare earths (RE) and heat treatment on the microstructure and mechanical properties of Mg-Li-Al-Zn-based alloy were investigated. The results show that the main phase compositions of Mg-5Li-3Al-2Zn ( LAZ532) alloy consist of alpha-Mg and AlLi. With the addition of RE, Al-RE precipitate forms, and increases gradually, whereas AlLi phase decreases. The room temperature tensile test reveals that the addition of RE could clearly improves the mechanical properties of alloys which are further improved after heat treatment. In more detail, excellent tensile strength and ductility are obtained in 1.5 wt.% RE containing alloy in as-cast state. After heat treatment, the 1.0 wt.% RE containing alloy attains superior tensile strength. The differences in tensile strength are related to the morphology, distribution of second phases and solid-solution strengthening in different alloy systems. In addition, the fracture pattern of the alloy is predominantly brittle cleavage and tends to be quasi-cleavage with RE addition. (C) 2010 Elsevier B.V. All rights reserved.
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