Structure and mechanical properties of cast quasicrystal-reinforced Mg–Zn–Al–Y base alloys
Structure and mechanical properties of cast quasicrystal-reinforced Mg–Zn–Al–Y base alloys
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DOI：
10.1557/jmr.2004.0205
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发表时间：
2004-05
影响因子：
2.7
通讯作者：
G. Yuan;K. Amiya;H. Kato;A. Inoue
中科院分区：
文献类型：
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作者：
G. Yuan;K. Amiya;H. Kato;A. Inoue
研究了以二十面体准晶相（i相）为主要强化相的Mg-Zn-Al-Y基铸造合金的组织和力学性能。采用铜模铸造法在中等冷却速率下制备了含i相的Mg-8 Zn-4Al-xY基块体合金。Y的加入有效地减小了i相的尺寸，提高了其分散状态的均匀性。室温压缩试验表明，该合金的力学性能明显上级常规AZ 91镁合金。高温蠕变试验表明，该合金具有良好的抗高温蠕变性能。并对强化机制进行了探讨。
The structure and mechanical properties of Mg–Zn–Al–Y base cast alloys containing an icosahedral quasicrystal phase (i-phase) as a main strengthening phase were investigated. Mg–8Zn–4Al– x Y base bulk alloys containing the i-phase were prepared by casting into a copper mold at moderate cooling rates. The Y addition was effective for decreasing the size of the i-phase and the increasing the homogeneity of its dispersed state. The mechanical properties examined by compression tests at room temperature were much superior to those of a conventional AZ91 Mg alloy. The creep tests at elevated temperatures indicated a promising high temperature creep resistance of the quasicrystal-reinforced Mg–Zn–Al–Y cast alloy. The strengthening mechanism was also discussed.