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Effect of relaxation on pressure sensitivity index in a Zr-based metallic glass

Yu, Gengsheng, Lin, Jianguo, Ma, Mo, Wang, Xiufeng, Wang, Fenghua and Wen, Cui`e 2007, Effect of relaxation on pressure sensitivity index in a Zr-based metallic glass, Materials science & engineering. A, Structural materials, vol. 460, no. 461, pp. 58-62, doi: 10.1016/j.msea.2007.01.012.

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Title Effect of relaxation on pressure sensitivity index in a Zr-based metallic glass
Author(s) Yu, Gengsheng
Lin, Jianguo
Ma, Mo
Wang, Xiufeng
Wang, Fenghua
Wen, Cui`e
Journal name Materials science & engineering. A, Structural materials
Volume number 460
Issue number 461
Start page 58
End page 62
Publisher Elsevier SA
Place of publication Lausanne, Switzerland
Publication date 2007-07-15
ISSN 0921-5093
Keyword(s) bulk metallic glass
pressure sensitivity index
shear band
free volume
Summary Shear-banding features of as-cast and annealed Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass were investigated through Rockwell indentation tests. Isothermal annealing of the as-cast samples was conducted at temperatures below its glass transition temperature, Tg. The exothermal enthalpy during continuous heating below Tg decreases with increasing annealing temperature, indicating the gradual reduction of free-volume upon annealing. The observation on the morphology of shear-banding pattern around the indents implies a reduced shear bands activity in the annealed samples. The included angles (2θ) between two families of shear bands emanating from the edge of Rockwell indent decrease from 88° for the as-cast sample to 79° for the sample annealed at 633 K for 1 h, indicating a pressure sensitive plasticity. By Mohr–Coulomb criterion, the pressure sensitive index can be obtained on the basis of the measured 2θ, which increases with increasing annealing temperature, indicating an increase of “atomistic friction” due to the reduction of the free volume upon annealing.
Notes Available online 13 January 2007
Language eng
DOI 10.1016/j.msea.2007.01.012
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2007 Elsevier B.V.
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Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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