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Tension and stress relaxation behavior of a La-based bulk metallic glass

Published online by Cambridge University Press:  31 January 2011

G.Q. Zhang ,
Q.K. Jiang ,
X.P. Nie ,
L.Y. Chen ,
L.N. Wang ,
M. Shao ,
X.D. Wang ,
Y.G. Liu ,
H.S. Xie  and
C.L. Qin
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G.Q. Zhang
Affiliation:
International Center for New-Structured Materials (ICNSM) and Laboratory of New-Structured Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China; and Key Laboratory of Advanced Textile Materials and Manufacturing Technology (Zhejiang Sci-Tech University), Ministry of Education, Hangzhou 310018, People’s Republic of China
Q.K. Jiang
Affiliation:
International Center for New-Structured Materials (ICNSM) and Laboratory of New-Structured Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
X.P. Nie
Affiliation:
International Center for New-Structured Materials (ICNSM) and Laboratory of New-Structured Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
L.Y. Chen
Affiliation:
International Center for New-Structured Materials (ICNSM) and Laboratory of New-Structured Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
L.N. Wang
Affiliation:
Key Laboratory of Advanced Textile Materials and Manufacturing Technology (Zhejiang Sci-Tech University), Ministry of Education, Hangzhou 310018, People’s Republic of China
M. Shao
Affiliation:
Key Laboratory of Advanced Textile Materials and Manufacturing Technology (Zhejiang Sci-Tech University), Ministry of Education, Hangzhou 310018, People’s Republic of China
X.D. Wang
Affiliation:
International Center for New-Structured Materials (ICNSM) and Laboratory of New-Structured Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
Y.G. Liu
Affiliation:
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, People’s Republic of China
H.S. Xie
Affiliation:
Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, People’s Republic of China
C.L. Qin
Affiliation:
Japan Science and Technology Agency, Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Japan
A. Inoue
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
Y.W. Wang
Affiliation:
International Center for New-Structured Materials (ICNSM) and Laboratory of New-Structured Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
J.Z. Jiang*
Affiliation:
International Center for New-Structured Materials (ICNSM) and Laboratory of New-Structured Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Tension and stress-relaxation behaviors of a La62Al14Cu11.7Ag2.3Ni5Co5 bulk metallic glass (BMG) as a function of isothermal annealing time have been investigated. It is found that annealing at 373 K below the glass-transition temperature (423 K) of the BMG alloy causes an increase of special heat difference at the glass transition and density of the alloy, indicating a reduction of free volume in the BMG alloy with annealing time. Compared with the as-cast sample, the fracture strength, Vickers hardness, viscosity, Young’s modulus, and stress-relaxation stability of the annealed BMGs increase with annealing time, which is caused by the reduction of free volume in the annealed samples. Furthermore, a change of fracture morphology from a mixture of smooth and furrow zones in the as-cast sample to a mainly furrow zone in the sample annealed for 8 h was also observed. All samples exhibit brittle behavior during tension tests.

Keywords

AlloyAmorphousFracture
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 12 , December 2007 , pp. 3303 - 3308
Copyright
Copyright © Materials Research Society 2007

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