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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 ,
H. Zhang ,
Z.F. Zhang ,
M. Stoica ,
G. He  and
J. Eckert
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: zhfzhang@imr.ac.cn
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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.

Keywords

HardnessMetallic glassStrength
Type
Articles
Information
Journal of Materials Research , Volume 20 , Issue 10 , October 2005 , pp. 2632 - 2638
Copyright
Copyright © Materials Research Society 2005

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