Influence of similar atom substitution on glass formation in (La-Ce)-Al-Co bulk metallic glasses

被引：179

作者：

Li, Ran ^{[1
]}

Pang, Shujie ^{[1
]}

Ma, Chaoli ^{[1
]}

Zhang, Tao ^{[1
]}

机构：

[1] Beijing Univ Aeronaut & Astronaut, Dept Mat Sci & Engn, Beijing 100083, Peoples R China

来源：

ACTA MATERIALIA | 2007年 / 55卷 / 11期

基金：

中国国家自然科学基金;

关键词：

rapid solidification; rare earth; bulk amorphous materials; metallic glasses; thermodynamics;

D O I：

10.1016/j.actamat.2007.02.026

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The glass-formation range of bulk metallic glasses (BMGs) based on lanthanum and cerium was pinpointed in the La-Al-Co, Ce-Al Co and pseudo-ternary (La-Ce)-Al-Co systems, respectively, by copper mold casting. Through the stepwise substitution of La for solvent Cc in (LaxCe1-x)(65)Al10Co25 alloys (0 < x < 1), the fully glassy rods of the (La0.7Ce0.3)(65)Al10Co25 alloy can be successfully produced up to 25 min in diameter by tilt-pour casting. Compared with the glass-forming ability (GFA) of single-lanthanide-based alloys, La65Al10Co25 and Ce65Al10Co25, the coexistence of La and Ce with similar atomic size and various valence electronic structure obviously improves the GFA of (LaxCe1-x)(65)Al10Co25 BMGs, and this cannot be explained by the conventional GFA criteria for BMGs, e.g. atomic size mismatch and negative heats of mixing. A thermodynamic model was proposed to evaluate this substitution effect, which gives a reasonable explanation for the obvious improvement of GFA induced by the coexistence of similar atoms. (c) 2007 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：3719 / 3726

页数：8

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