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Deformation behaviors and mechanism of Ni–Co–Nb–Ta bulk metallic glasses with high strength and plasticity

Published online by Cambridge University Press:  03 March 2011

Y.H. Liu ,
G. Wang ,
M.X. Pan ,
P. Yu ,
D.Q. Zhao  and
W.H. Wang
Y.H. Liu
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
G. Wang
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
M.X. Pan
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
P. Yu
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
D.Q. Zhao
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
W.H. Wang*
Affiliation:
Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

A class of Ni–Co–Nb–Ta bulk metallic glasses (BMGs) with a high glass-forming ability is developed. With proper compositional modification, the BMGs exhibit the enhanced plastic strain (up to 4%) and the ultimate strength (up to 3540 MPa). It is found that the interactions of shear bands such as intersecting, arresting, and branching, which normally are related to the plastic metallic glasses, can be observed both in the plastic and brittle Ni–Co–Nb–Ta BMGs. Obvious serrated flow behavior is observed during plastic deformation. The origins of the plasticity and the serrated flow in the Ni-based BMGs are analyzed in analogy to that in crystalline materials.

Keywords

AlloyAmorphousFracture
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 4 , April 2007 , pp. 869 - 875
Copyright
Copyright © Materials Research Society 2007

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References

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