Phase-separated microstructures and shear-banding behavior in a designed Zr-based glass-forming alloy

被引：53

作者：

Du, X. H. ^{[1
,2
]}

Huang, J. C. ^{[1
]}

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

Chou, H. S. ^{[1
]}

Lai, Y. H. ^{[1
]}

Hsieh, K. C. ^{[1
]}

Jang, J. S. C. ^{[3
]}

Liaw, P. K. ^{[4
]}

机构：

[1] Natl Sun Yat Sen Univ, Inst Mat Sci & Engn, Ctr Nanosci & Nanotechnol, Kaohsiung 804, Taiwan

[2] Shenyang Inst Aeronaut Engn, Dept Mat Engn, Shenyang 110034, Peoples R China

[3] I Shou Univ, Dept Mat Sci & Engn, Kaohsiung 840, Taiwan

[4] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

来源：

INTERMETALLICS | 2009年 / 17卷 / 08期

基金：

美国国家科学基金会;

关键词：

Glasses; metallic; Mechanical properties at ambient temperature; Phase diagram; prediction; Electron microscopy; transmission; BULK METALLIC GLASSES; MECHANICAL-PROPERTIES; SUPERCOOLED LIQUID; PLASTICITY; NI; COMPOSITES; SURFACE; CO;

D O I：

10.1016/j.intermet.2009.01.019

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：

We have employed a thermodynamic-computation approach to identify the composition of the Zr-Cu-Ni-Al alloy system exhibiting a two-liquid miscibility phase equilibrium in the liquid-temperature region, which tends to favor the occurrence of the liquid-phase separation. Guided by these calculated diagrams, a Zr-based alloy with a 10 at.% Al is designed, and its bulk-metallic glass (BMG) is prepared successfully by the copper-mould suction casting. A heterogeneous microstructure characterized by the existence of phase-separated regions with several to decades micrometers in size forms in the BMG. Under uniaxial compressive loading, the designed Zr-based BMG demonstrates the continuous "work hardening" and remarkable macroscopic plastic strain at room temperature. The improvement of mechanical properties is attributed to the unique glassy structure correlated with both the heterogeneous microstructure and the micro-scaled phase separation, leading to the extensive shear-band formation, interaction, and multiplication. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：607 / 613

页数：7

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