Mechanical responses of Mg-based bulk metallic glasses

被引：13

作者：

Jian, S. -R. ^{[1
]}

Li, J. -B. ^{[1
]}

Chen, K. -W. ^{[2
]}

Jang, Jason S. -C. ^{[3
]}

Juang, J. -Y. ^{[4
]}

Wei, P-J ^{[5
]}

Lin, J-F. ^{[2
,6
]}

机构：

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

[2] Natl Cheng Kung Univ, Dept Mech Engn, Tainan 701, Taiwan

[3] Natl Cent Univ, Inst Mat Sci & Engn, Dept Mech Engn, Chungli 320, Taiwan

[4] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 300, Taiwan

[5] Natl Cheng Kung Univ, Inst Nanotechnol & Microsyst Engn, Tainan 701, Taiwan

[6] Natl Cheng Kung Univ, Ctr Micro Nano Sci & Technol, Tainan 701, Taiwan

来源：

INTERMETALLICS | 2010年 / 18卷 / 10期

关键词：

Glasses; metallic; Mechanical properties; theory; Mechanical testing; Electron microscopy; transmission; PLASTIC-DEFORMATION; SUBSURFACE DEFORMATION; SUPERCOOLED LIQUID; SERRATED FLOW; NANOINDENTATION; INDENTATION; EVOLUTION; HARDNESS;

D O I：

10.1016/j.intermet.2010.03.034

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：

In this study, the mechanical responses of the bonded interface method derived Mg58Cu28.5Gd11Ag2.5 bulk metallic glasses (BMG) under the micro-/nano-indentation are investigated. A modified expanding cavity model is developed to analyze the morphological observations of shear band by Vickers indentation. Results indicate that the radius ratio of any two adjacent shear band circles is approximately constant. The ratio of the shear band deformation zone to the contact radius induced by indentation is also a constant, which depends on the constraint factor (the ratio of hardness to yield strength) of the material. The features predicted by the present model are consistent with the results obtained from the indentation experiments, indicating the validity of the expanding cavity model for describing the mechanical behaviors of the BMG materials. The cross-sectional transmission electron microscopy (XTEM) observations reveal that the terraced shear bands are formed on the interface of the bonded Mg-based BMG. The microstructures for the Vickers indentation-induced terraced shear bands are also discussed. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：1930 / 1935

页数：6

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