Bending property enhancements of Zr55Cu30Al10Ni5 bulk metallic glass: Effects of various surface modifications

被引：11
|
作者：
Yu, Chia-Chi [1 ]
Chu, Jinn P. [1 ]
Lee, Cheng-Min [1 ]
Diyatmika, Wahyu [1 ]
Chang, M. H. [2 ]
Jeng, Jeng-Ywan [2 ]
Yokoyama, Yoshihiko [3 ]
机构：
[1] Natl Taiwan Univ Sci & Technol, Dept Mat Sci & Engn, Taipei 10607, Taiwan
[2] Natl Taiwan Univ Sci & Technol, Dept Mech Engn, Taipei 10607, Taiwan
[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2015年 / 633卷
关键词：
Bulk metallic glass; Thin film metallic glass; Scratch; Femtosecond laser patterning; Four-point bending; Shear bands; MACROSCOPIC TENSILE PLASTICITY; MECHANICAL-PROPERTIES; SHEAR BANDS; IMPROVEMENT; COMPOSITES; DUCTILITY; THIN;
D O I：
10.1016/j.msea.2015.03.016
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Effects of various surface modifications on four-point bending property improvements of Zr55Cu30Al10Ni5 bulk metallic glass (BMG) are systematically studied. Surface modifications investigated include thin-film metallic glass coating, artificial scratches and femtosecond laser patterning. After modifications, the negligible plastic strain of 3-mm-thick BMG is found to markedly enhance to similar to 9.2%, without sacrificing its extraordinary strength. Instead, bending yield and fracture strengths in the surface-modified samples are increased to similar to 2.8 GPa and similar to 4.0 GPa, respectively, corresponding to a rise of similar to 66% from those of as-cast samples. In addition, the samples with surface modifications exhibit distinct shear band morphologies. Relationships between the shear band offset, shear band spacing and plastic strain of bent BMG samples are established. Our experimental results demonstrate that BMG is able to survive plastic flow without abrupt fracture through proper designs of surface modifications, in which large numbers of shear bands are formed to distribute the strain effectively upon loading. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：69 / 75
页数：7
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