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Indentation study on the pressure sensitivity of a ZR-based bulk metallic glass

Lin, Jianguo, Xie, Haowen, Li, Yuncang, Hodgson, Peter and Wen, Cui`e 2007, Indentation study on the pressure sensitivity of a ZR-based bulk metallic glass, Materials forum (CD-ROM), vol. 31, pp. 139-143.

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Title Indentation study on the pressure sensitivity of a ZR-based bulk metallic glass
Author(s) Lin, Jianguo
Xie, Haowen
Li, Yuncang
Hodgson, Peter
Wen, Cui`e
Journal name Materials forum (CD-ROM)
Volume number 31
Start page 139
End page 143
Publisher Institute of Materials Engineering Australasia Pty Ltd
Place of publication North Melbourne, Vic.
Publication date 2007
ISSN 1447-6738
Keyword(s) bulk metallic glass
pressure sensitivity index
shear band; free volume
Summary Spherical indentation test was conducted on as-cast and annealed Zr41.2Ti13.8Cu12.5Ni10Be22.5 bulk metallic glass, and the evolution of the morphology of the deformation zone of indents upon annealing was investigated. The DSC traces of the as-cast and annealed samples show that the enthalpy change at the glass transition, ΔH, decreases with the increasing of annealing temperature, indicating the reduction of the free volume upon annealing. The morphology of the indents implies a reduced shear band activity in the annealed samples. The included angles (2θ) between two families of shear bands emanating from the edge of spherical indent in the as-cast and the annealed samples were measured to be in the range of 88-79°, which decrease with the increasing of annealing temperature, indicating pressure sensitive plasticity in the as-cast and annealed samples. By Mohr–Coulomb criterion, the pressure sensitive index, α, can be obtained on the basis of the measured 2θ. The sensitivity index increases with increasing temperature, implying an increase of 'atomistic friction' due to the reduction of the free volume upon annealing.
Language eng
Field of Research 091207 Metals and Alloy Materials
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©Reproduced with the specific permission of the copyright owner.
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30007532

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.