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Characterization of hydrogen-induced structural changes in Zr-based bulk metallic glasses using positron annihilation spectroscopy

Published online by Cambridge University Press:  03 July 2012

Fuyu Dong ,
Yanqing Su ,
Liangshun Luo ,
Jingjie Guo ,
Hengzhi Fu ,
Zhuoxi Li  and
Baoyi Wang
Fuyu Dong*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Yanqing Su
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Liangshun Luo*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Jingjie Guo
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Hengzhi Fu
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Zhuoxi Li
Affiliation:
Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
Baoyi Wang
Affiliation:
Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
*
a)Address all correspondence to these authors. e-mail: dongfuyu2002@163.com
b)e-mail: luols@hit.edu.cn
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Abstract

The effects of hydrogen on the structure of Zr-based bulk metallic glasses were investigated by positron annihilation lifetime spectroscopy. Three lifetime components are identified, indicating the presence of three distinct size ranges for open volume defects in the glass. The concentration of the smallest sites identified as tetrahedral interstitial holes in the densely packed and the intermediate sites identified as flow defects, changes with hydrogen addition. The concentration of tetrahedral interstitial holes in Zr55Cu30Ni5Al10 alloys initially increases with the increase of hydrogen content. When Zr55Cu30Ni5Al10 alloys were prepared in Ar + 10%H2 atmospheres, the concentration of tetrahedral interstitial holes reaches a maximum, which may provide a more dense random-packed structure. For Zr57Al10Cu15.4Ni12.6Nb5alloys, the increase of hydrogen content causes a decrease in the concentration of tetrahedral interstitial holes and an increase in the concentration of flow defects.

Type
Articles
Information
Journal of Materials Research , Volume 27 , Issue 20 , 28 October 2012 , pp. 2587 - 2592
Copyright
Copyright © Materials Research Society 2012

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