Strengthening mechanisms of Zr-based devitrified amorphous alloy nanocomposites

被引：19

作者：

Kim, HS ^{[1
]}

机构：

[1] Chungnam Natl Univ, Dept Met Engn, Taejon 305764, South Korea

来源：

SCRIPTA MATERIALIA | 2003年 / 48卷 / 01期

基金：

日本学术振兴会;

关键词：

metallic glasses; composite; strengthening mechanism; mechanical properties;

D O I：

10.1016/S1359-6462(02)00344-5

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Devitrified amorphous alloy nanocomposites with nanoscale precipitates are regarded as new prospective structural materials with superior mechanical properties such as high strength and shear resistance. However, the strengthening mechanism of the devitrified amorphous nanocomposites has not been clearly elucidated. In order to analyse the strengthening behaviour of the partially devitrified amorphous alloys, the change in solute concentration of Zr-based alloys during the devitrification process by heat treatment was investigated. It was found that the solute concentration of the remaining amorphous matrix increases during the devitrification when the solute concentration of the initial amorphous alloy is higher than that of the precipitate, such as Zr2Cu precipitate from Zr60CU20Ni10Pd10 alloy. On the other hand, the solute is diluted in the remaining amorphous matrix during the devitrification when the solute concentration of the initial amorphous alloy is lower than that of the precipitate, such as Zr2Cu precipitate from Zr70Cu10Ni10Pd10 alloy. Investigating this solute concentration change and the associated mechanical properties shows that it is the phase mixtures model, and not the solute concentration model, that provides an adequate description of the devitrified amorphous nanocomposites. (C) 2003 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.

引用

页码：43 / 49

页数：7

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