Formation of glassy and icosahedral phases in as-cast (Zr9Ni4)75(Al1−xTix)25 alloys
Formation of glassy and icosahedral phases in as-cast (Zr9Ni4)75(Al1−xTix)25 alloys
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DOI：
10.1016/j.scriptamat.2006.06.008
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发表时间：
2006-10
影响因子：
6
通讯作者：
J. Qiang;Wei Zhang;A. Inoue
中科院分区：
文献类型：
--
作者：
J. Qiang;Wei Zhang;A. Inoue
二十面体原子团簇被认为是二十面体准晶（I相）和许多块体金属玻璃（BMG）的结构单元。考虑到这一点，设计了一系列（Zr 9 Ni 4）75（Al 1-xTix）25合金，并制备了直径3 mm的带和棒。这些块体样品的结构分析表明，Al和Ti的BMG和I相的形成显着的合金化效果。BMG在低Ti组合物（x ≤ 0.20）下形成。随着Ti浓度的增加，I相开始在玻璃基体中形成，并且在无Al合金中获得几乎整体的I相合金。通过考虑Al和Ti在局部二十面体原子结构稳定化中的不同作用，讨论了合金化效应。
The icosahedral atomic cluster has been recognized as the building block of icosahedral quasicrystals (I-phase) and many bulk metallic glasses (BMGs). With this in mind, a series of (Zr9Ni4)75(Al1−xTix)25alloys were designed, and ribbons and rods of 3mm in diameter were prepared. Structural analysis of these bulk samples revealed a pronounced alloying effect of Al and Ti on the formation of BMG and I-phase. BMGs were formed at low Ti compositions (x⩽0.20). As the Ti concentration increased, an I-phase began to form in the glassy matrix, and a nearly monolithic I-phase alloy was obtained in the Al-free alloy. The alloying effect is discussed by considering the different roles of Al and Ti in the stabilization of local icosahedral atomic structures.