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Vickers hardness and compressive properties of bulk metallic glasses and nanostructure-dendrite composites

Published online by Cambridge University Press:  03 March 2011

X.F. Pan
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China; and School of Materials Science and Engineering, Tianjin University, Tianjin 300072, People’s Republic of China
H. Zhang
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Z.F. Zhang*
Affiliation:
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
M. Stoica
Affiliation:
Leibniz Institute for Solid State and Materials Research Dresden, Institute of Metallic Materials, D-01171 Dresden, Germany
G. He
Affiliation:
School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, People’s Republic of China
J. Eckert
Affiliation:
Physical Metallurgy Division, Department of Materials and Geo Sciences, Darmstadt University of Technology, D-64287 Darmstadt, Germany
*
a)Address all correspondence to this author.e-mail: [email protected]
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Abstract

The compressive properties and the Vickers hardness of Cu-, Fe-, Mg-, and Zr-based monolithic bulk metallic glasses (BMGs) as well as Ti-based nanostructure-dendrite composites were investigated and compared. The monolithic BMGs exhibit nearly the same yield strength σ y and fracture strength σf but poor plasticity. The Vickers hardness HV of the monolithic BMGs follows the empirical relationship HV/3 ≈σy ≈σf. The Ti-based composites yield at a relatively low stress level (less than 850 MPa) but fail at a very high fracture stress (∼ 2 GPa) and exhibit a large strain hardening ability. Accordingly, the Vickers hardness HV of the Ti-based nanostructure-dendrite composites obeys the relationship σy <HV/3 <σf. Based on these results, the relationship between the Vickers hardness and the compressive properties of the investigated materials will be discussed by taking the yield and fracture strength (σ y and σf), the strain hardening exponent n, and the elastic and plastic energy stored upon deformation (δΕ and δP) into account.

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Articles
Copyright
Copyright © Materials Research Society 2005

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References

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