Dissimilar nanoscaled structural heterogeneity in U-based metallic glasses revealed by nanoindentation

被引：30

作者：

Ke, H. B. ^{[1
]}

Zhang, R. ^{[1
]}

Sun, B. A. ^{[2
]}

Zhang, P. G. ^{[1
]}

Liu, T. W. ^{[1
]}

Chen, P. H. ^{[1
]}

Wu, M. ^{[1
]}

Huang, H. G. ^{[1
]}

机构：

[1] China Acad Engn Phys, Inst Mat, POB 9071, Jiangyou 621907, Sichuan, Peoples R China

[2] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 788卷

基金：

中国国家自然科学基金;

关键词：

U-based amorphous alloy; Structural heterogeneity; Nanoindentation; Creep; MECHANICAL-BEHAVIOR; CREEP-BEHAVIOR; DEFORMATION;

D O I：

10.1016/j.jallcom.2019.02.256

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Nanoscaled structure inhomogeneity has been identified to be an inherent characteristic of metallic glasses (MGs). Structural heterogeneities are also found to play a key role in designing and tuning the mechanical and relaxation behavior of MGs. As one peculiar member of the glassy family, U-based MGs show novel unique properties desirable for nuclear industries. However, the heterogeneous characteristics of this type of MGs have never been studied so far. In this study, U65Fe30Al5 and U60Fe27.5Al12.5 MGs were systematically investigated with nanoindentation of high sensitivity. They exhibit significantly different mechanical response for the primary and secondary creeps at varying loading rates and peak loads. Through analysis with the theoretical creep model for viscoelastic materials, U60Fe27.5Al12.5 MG is found to be in a more rigid state for the secondary (viscous) creep, suggesting more compact atomic structure for it. By further analysis and fitting with this model, dissimilar structural heterogeneity can be derived for these two MGs to account for their difference in creeping behavior. This work manifests that nanoindentation is a very useful technique to reveal heterogeneous structures of glassy alloys, and also to establish their composition-structure-property relationship. (C) 2019 Published by Elsevier B.V.

引用

页码：391 / 396

页数：6

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