Enhanced plasticity in Zr-Cu-Ag-Al-Be bulk metallic glasses

被引：18

作者：

Cao, Q. P. ^{[1
,2
]}

Jin, J. B. ^{[1
,2
]}

Ma, Y. ^{[1
,2
]}

Cao, X. Z. ^{[3
]}

Wang, B. Y. ^{[3
]}

Qu, S. X. ^{[4
]}

Wang, X. D. ^{[1
,2
]}

Zhang, D. X. ^{[5
]}

Jiang, J. Z. ^{[1
,2
]}

机构：

[1] Zhejiang Univ, Int Ctr New Struct Mat, Hangzhou 310027, Zhejiang, Peoples R China

[2] Zhejiang Univ, Lab New Struct Mat, Dept Mat Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China

[3] Chinese Acad Sci, Inst High Energy Phys, Key Lab Nucl Radiat & Nucl Energy Technol, Beijing 100049, Peoples R China

[4] Zhejiang Univ, Inst Appl Mech, Hangzhou 310027, Zhejiang, Peoples R China

[5] Zhejiang Univ, State Key Lab Modem Opt Instrumentat, Hangzhou 310027, Zhejiang, Peoples R China

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2015年 / 412卷

基金：

中国国家自然科学基金; 国家高技术研究发展计划(863计划);

关键词：

Bulk metallic glass; Bending plasticity; Poisson's ratio; Free volume; Shear transformation zone; FREE-VOLUME; POSITRON-ANNIHILATION; MECHANICAL-BEHAVIOR; INHOMOGENEOUS FLOW; AMORPHOUS-ALLOYS; FORMING ABILITY; SHEAR BANDS; INDENTATION; TEMPERATURE; DEFORMATION;

D O I：

10.1016/j.jnoncrysol.2015.01.002

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The dependences of bending plasticity on compositional adjustment and structural relaxation in Zr-Cu-Ag-Al-Be bulk metallic glasses (BMGs) were systematically studied. We revealed that with increasing Zr content, the plasticity was enhanced at the expense of glass forming ability and the shear transformation zone (STZ) volume became larger, while structural relaxation resulted in the embrittlement accompanied with the further enlarged STZ volume. Average positron lifetime, representing average free volume content, dropped with the increased Zr content and structural relaxation. These results indicate that neither STZ volume nor average positron lifetime can solely describe plastic deformability of BMGs. Analyzing positron annihilation lifetime spectra, a bimodal distribution of free volume size was observed. The smaller free volume shrinks with increased concentration and the larger free volume expands with decreased concentration due to the increase in the Zr content, while structural relaxation mainly reduces smaller free volume. The effects of free volume size distribution on the STZ activation and shear band propagation have been discussed. It has been demonstrated that combining the STZ volume with free volume size distribution can explain the plasticity evolution with composition and structural relaxation, which may shed light on understanding the deformation mechanism of BMGs. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：35 / 44

页数：10

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