Liquid fragility and characteristic of the structure corresponding to the prepeak of AlNiCe amorphous alloys

被引：46

作者：

Hu, LN ^{[1
]}

Bian, MF ^{[1
]}

Wang, WM ^{[1
]}

Zhang, JY ^{[1
]}

Jia, YB ^{[1
]}

机构：

[1] Shandong Univ, Minist Educ, Key Lab Liquid Struct & Hered Mat, Jinan 250061, Peoples R China

来源：

ACTA MATERIALIA | 2004年 / 52卷 / 16期

基金：

中国国家自然科学基金;

关键词：

metallic glasses; fragility; glass-forming ability; medium-range order; correlation length;

D O I：

10.1016/j.actamat.2004.06.035

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Liquid fragility and its relation to characteristic of the structure corresponding to the prepeak have been investigated for the Al-NiCe alloy system. Thermal analysis shows that in the Al-rich ternary system, the fragility strength exhibits a strong dependence on the Ce content. A close correlation between liquid fragility and the stability of the structure corresponding to the prepeak, as well as the correlation length, is observed for these alloys. Strong liquids correspond to stable medium-range order structure, which results from large energy of cluster breakage. It has been found that the influence of Ce additions on the stability of the structure corresponding to the peak is completely opposite to that on the thermal stability of the glasses. Besides, no obvious relationship exists between dynamic fragility and the glass-forming ability. These unexpected observations have been explained in terms of structural relaxation of the clusters in liquids exhibiting different dynamic fragilities. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：4773 / 4781

页数：9

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