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Structural characterization and mechanical properties of nanocrystal-containing Cu–Ti-based bulk metallic glass-forming alloys

Published online by Cambridge University Press:  03 March 2011

Y.F. Sun ,
F.S. Li ,
S.K. Guan ,
M.Q. Tang  and
C.H. Shek
Y.F. Sun*
Affiliation:
Research Center for Materials, Department of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, People’s Republic of China
F.S. Li
Affiliation:
Research Center for Materials, Department of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, People’s Republic of China
S.K. Guan
Affiliation:
Research Center for Materials, Department of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, People’s Republic of China
M.Q. Tang
Affiliation:
Research Center for Materials, Department of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450002, People’s Republic of China
C.H. Shek
Affiliation:
Department of Physics and Materials Science, City University of Hong Kong, Kowloon Tong, Hong Kong, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Cylindrical Cu42.5Ti41.5Ni7.5Zr2.5Hf5Si1 bulk metallic glass with a diameter of 2 mm was fabricated by copper-mold casting. X-ray diffraction and differential scanning calorimetry analysis of the material showed that the alloy has a homogenous amorphous structure and high glass-forming ability. However, detailed observation by transmission electron microscopy revealed that a kind of nanocrystal with size of about 20 nm is sparsely distributed in the glass matrix. Nanobeam electron diffraction experiments indicated that the nanocrystal has a face-centered cubic crystalline structure. Room-temperature compression tests revealed that the alloy has a high fracture strength of 2250 MPa and obvious plastic strain of about 5.3%. Nanoindentation tests revealed that the as-cast alloy exhibits obviously serrated flow over a wide range of loading rate from 0.5 to 10 mN/min.

Keywords

AlloyAmorphousMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 2 , September 2006 , pp. 352 - 357
Copyright
Copyright © Materials Research Society 2007

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