Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 684, Issue -, Pages 517-523Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.12.075
Keywords
Metallic glass; Hardness measurement; Shear bands; Nanoindentation; Residual stresses; Rejuvenation
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Funding
- European Commission, Marie Curie Actions - Initial Training Networks (ITN) in the frame of the project VitriMetTech - Vitrified Metals Technologies and Applications in Devices and Chemistry [607080 FP7-PEOPLE-2013-ITN]
- Austrian Science Fund FWF [I1309]
- Austrian Science Fund (FWF) [I1309] Funding Source: Austrian Science Fund (FWF)
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The lack of plasticity in metallic glasses (MGs) is currently the main drawback limiting their commercialization. Mechanical treatments such as high-pressure torsion (HPT) or cold rolling have successfully improved the plasticity of some MGs. We asked whether we can quantify the change in shear band behavior associated with this enhanced plasticity. To answer this question, we performed numerous nanoindentation measurements on as-cast, annealed and HPT deformed Pt-based BMG samples. We observed different shear band sliding velocities depending on the samples. The amplitude of the velocity peak decreased after HPT deformation and increased after annealing. This study reveals that the decrease in shear band sliding velocity quantifies the degree of rejuvenation in the material after mechanical treatment. The role of the residual stresses on shear band population density is also presented. Thanks to this new approach, it becomes now possible to compare different mechanical treatments, and their ability to rejuvenate a MG.
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