Correlation between local structure and stability of supercooled liquid state in Zr-based metallic glasses
Correlation between local structure and stability of supercooled liquid state in Zr-based metallic glasses
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DOI：
10.1016/j.msea.2006.02.334
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发表时间：
2007-03
期刊：
影响因子：
6.4
通讯作者：
J. Saida;M. Imafuku;S. Sato;T. Sanada;E. Matsubara;A. Inoue
中科院分区：
文献类型：
--
作者：
J. Saida;M. Imafuku;S. Sato;T. Sanada;E. Matsubara;A. Inoue
本文研究了Zr_（70）（Ni，Cu）_（30）和Zr_（70）Al_（10）（Ni，Cu）_（20）二元合金的局域结构与过冷液态稳定性之间的关系。三元金属玻璃Zr 70 Ni 30二元非晶合金具有低的过冷液态稳定性，在Ni原子周围存在类四元Zr 2Ni局域结构。同时，Zr 70 Cu 30二元金属玻璃具有与四方相Zr 2Cu不同的局域结构，其中我们通过引入少量贵金属的准晶化行为推测为二十面体局域结构。Al的加入对Zr-Ni合金中的局部结构的影响也被检查。我们已经研究了主导的局部结构的变化，在二十面体的结构，从四方Zr 2Ni的局部结构的Al与Ni取代伴随着显着的稳定的过冷液态。结果表明，二十面体局域结构的形成有助于提高Zr基合金过冷液态的稳定性。
The correlation between the local structure and stability of supercooled liquid state is investigated in the Zr70(Ni, Cu)30binary and Zr70Al10(Ni, Cu)20(numbers indicate at.%) ternary metallic glasses. The Zr70Ni30binary amorphous alloy with a low stability of supercooled liquid state has a tetragonal Zr2Ni-like local structure around Ni atom. Meanwhile, the Zr70Cu30binary metallic glass has a different local structure of tetragonal Zr2Cu, where we suggest the icosahedral local structure by the quasicrystallization behavior in addition of a very small amount of noble metals. The effect of Al addition on the local structure in the Zr–Ni alloy is also examined. We have investigated that the dominant local structure changes in the icosahedral-like structure from the tetragonal Zr2Ni-like local structure by the Al substitution with Ni accompanying with the significant stabilization of supercooled liquid state. It is concluded that the formation of icosahedral local structure contributes to the enhancement of stability of supercooled liquid state in the Zr-based alloys.