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

journal contribution
posted on 2007-07-15, 00:00 authored by G Yu, J Lin, M Ma, X Wang, F Wang, Cui'E Wen
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.

History

Journal

Materials science & engineering. A, Structural materials

Volume

460

Issue

461

Pagination

58 - 62

Publisher

Elsevier SA

Location

Lausanne, Switzerland

ISSN

0921-5093

eISSN

1873-4936

Language

eng

Notes

Available online 13 January 2007

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

2007 Elsevier B.V.