LETTER TO THE EDITOR: Roles of local icosahedral chemical ordering in glass and quasicrystal formation in metallic glass formers
LETTER TO THE EDITOR: Roles of local icosahedral chemical ordering in glass and quasicrystal formation in metallic glass formers
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DOI：
10.1088/0953-8984/15/31/102
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发表时间：
2003-08
期刊：
影响因子：
--
通讯作者：
Hajime Tanaka
中科院分区：
文献类型：
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作者：
Hajime Tanaka
众所周知，大块金属玻璃形成物具有局部二十面体化学有序的倾向。我们认为，这种短程键有序和长期结晶有序之间的挫折控制了这些液体的易碎性和玻璃形成能力。我们的模型表明，具有更强的局部二十面体有序倾向的体系应该更不脆弱，并且是更好的玻璃原体。这种情况也很自然地解释了液体中局部二十面体有序度、玻璃可成形性和准晶可成形性之间的密切关系。
It is well known that bulk metallic glass formers have a tendency to show local icosahedral chemical ordering. We argue that the frustration between this short-range bond ordering and the long-range crystalline ordering controls the fragility and the glass-forming ability of these liquids. Our model suggests that a system having a stronger tendency to show local icosahedral ordering should be less fragile and a better glass former. This scenario also naturally explains the close relationship among the degree of local icosahedral ordering in liquid, glass formability, and quasicrystal formability.