Improving the plasticity of bulk metallic glasses via pre-compression below the yield stress

被引：32

作者：

Gu, Ji ^{[1
]}

Song, Min ^{[1
]}

Ni, Song ^{[1
]}

Liao, Xiaozhou ^{[2
]}

Guo, Shengfeng ^{[3
]}

机构：

[1] Cent S Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

[2] Univ Sydney, Sch Aerosp Mech & Mech Engn, Sydney, NSW 2006, Australia

[3] Southwest Univ, Fac Mat & Energy, Chongqing 400715, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 602卷

基金：

澳大利亚研究理事会; 中国国家自然科学基金;

关键词：

Bulk metallic glasses; Pre-compression; Plasticity; Free volume; Nanocrystallite; AMORPHOUS-ALLOYS; MECHANICAL-BEHAVIOR; SHEAR-BAND; ENHANCED PLASTICITY; ROOM-TEMPERATURE; ZRC PARTICLES; FREE-VOLUME; DEFORMATION; DUCTILITY; COMPOSITES;

D O I：

10.1016/j.msea.2014.02.065

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The poor plasticity of bulk metallic glasses (BMGs) has severely limited their potential structural applications. In this paper, we reported that uniaxial pre-compression below the yield stress can be used to significantly improve the plasticity of BMGs. An as-cast Cu36Zr48Al8Ag8 BMG was pre-compressed under various pressures (400, 800 and 1600 MPa) and durations (30, 60 and 120 mm). The pre-compression processes led to structural change that increases the free volume and produces nanocrystals in the BMG matrix, which subsequently improved the plasticity of the BMG. Detailed data analysis showed that increasing the applied pressure speeds up the structural relaxation process and nanocrystallization occurs only at high enough pressure. This investigation indicated that appropriate selection of the pressure and duration of a pre-compression process is critical for the improved plasticity of BMGs. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：68 / 76

页数：9

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