Formation and stability of quasicrystalline and hexagonal approximant phases in an Al-Mn-Be alloy

被引:23
|
作者
Song, GS [1 ]
Fleury, E
Kim, SH
Kim, WT
Kim, DH
机构
[1] Yonsei Univ, Dept Met Engn, Ctr Noncrystalline Mat, Seoul 120749, South Korea
[2] Chonju Univ, Dept Phys, Chonju 360746, South Korea
关键词
D O I
10.1557/JMR.2002.0246
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Phase formation and thermal stability for an Al-Mn-Be alloy have been investigated by melt-spinning and conventional casting. Significant differences in the phase formation and the thermal stability of the microstructure were found as a result of the different cooling rates. In the melt-spun ribbons, a large volume fraction of a metastable icosahedral phase was found to coexist with an Al solid solution. In the bulk cast ingots, the primary phase formed in the two-phase microstructure was a hexagonal approximant phase of quasicrystals. This phase that solidified in the form of faceted particles embedded in the Al solid matrix proved to be thermodynamically stable during annealing at 540 degreesC for 100 h. The effect of Be addition on the formation of the stable approximant phase is discussed in terms of the Hume-Rothery mechanism.
引用
收藏
页码:1671 / 1677
页数:7
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