Change in free volume during the homogeneous flow of Zr-based bulk metallic glass matrix composite

被引：14
作者：
Chen, Q. [1 ]
Liu, L. [1 ]
Chan, K. C. [2 ]
机构：
[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China
[2] Hong Kong Polytech Univ, Dept Ind & Syst Engn, Adv Mfg Technol Res Ctr, Hong Kong, Hong Kong, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 467卷 / 1-2期
关键词：
Amorphous materials; Composite materials; Rapid-solidification; Quenching; Thermodynamic properties; SUPERCOOLED LIQUID REGION; DEFORMATION-BEHAVIOR; PLASTIC-DEFORMATION; TEMPERATURE; TRANSITION;
D O I：
10.1016/j.jallcom.2007.12.028
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：
The influence of plastic deformation on the structure of a Zr55.9Cu18.6Ta8Al7.5Ni10 bulk metallic glass composite (BMGC) with a Ta solid solution as the second phase was investigated during a compression test in the supercooled liquid region, as a function of strain rate and the amount of strain. The structure of the BMGC after deformation was characterized by means of X-ray diffraction (XRD), differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). It was found that an increase in excess free volume took place during plastic deformation. High strain rate can promote the generation of more free volume, which eventually leads to a reduction of the glass transition temperature and even splitting of the crystallization process. Microhardness measurement indicated that deformation induced softening of the BMG composite, probably due to the formation of nanovoids resulting from the increase of free volume. (C) 2007 Elsevier B.V. All fights reserved.
引用
收藏
页码：208 / 212
页数：5
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