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Thermal Dependence of Shear Banding in Zr70Ni16Cu6Al8 Bulk Metallic Glasses
Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, Department of Materials Science and Engineering.
2014 (English)MasteroppgaveStudent thesis
Abstract [en]

Zr70Ni16Cu6Al8 bulk metallic glass samples were cast and prepared for tensile testing. Tensile tests were done at temperatures 77 K, 150 K and 295 K, over a range of effective strain rates between 10−5 and 10−1/s in order to assess the dependence of plastic deformation through shear band sliding on the aforementioned factors. A strong temperature dependence was found, with maximum shear band sliding distance at 150 K. The sliding distance was also found to increase with lowered strain rates. The temperature dependence is likely to stem from increased heat dissipation suppressing a decrease in viscosity, while the strain rate dependence stems from a decrease in energy supply rate. Shear bands appeared at higher stresses at lower temperatures, resulting in larger elastic domains and higher ultimate tensile stresses. A mechanism where heat dissipation suppresses the formation of shear bands at low stresses was proposed. v

Place, publisher, year, edition, pages
Institutt for materialteknologi , 2014. , 55 p.
Keyword [no]
ntnudaim:12179, MTMT Materialteknologi, Materialutvikling og -bruk
URN: urn:nbn:no:ntnu:diva-27347Local ID: ntnudaim:12179OAI: diva2:769321
Available from: 2014-12-07 Created: 2014-12-07

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