Thermal Dependence of Shear Banding in Zr70Ni16Cu6Al8 Bulk Metallic Glasses
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
Place, publisher, year, edition, pages
Institutt for materialteknologi , 2014. , 55 p.
ntnudaim:12179, MTMT Materialteknologi, Materialutvikling og -bruk
IdentifiersURN: urn:nbn:no:ntnu:diva-27347Local ID: ntnudaim:12179OAI: oai:DiVA.org:ntnu-27347DiVA: diva2:769321
Arnberg, Lars, ProfessorYokoyama, Yoshihiko