Low-temperature mechanical properties of Ce_(68)Al_(10)Cu_(20)Co_2 bulk meta11ic glass

摘要

Although it is we11 known that traditional metals and a11oys wi11 become brittle at low temperatures, the effect of low temperature on the mechanical properties of bulk meta11ic glasses (BMGs) is yet to be fu11y understood. In this research, the mechanical properties of Ce_(68)Al_(10)Cu_(20)Co_2 BMG are investigated at low temperatures. It is found that the yield strength of the Ce-based BMG increases significantly with the decrease of temperature. The elastic moduli of the BMG also increase monotonica11y with the drop of temperature, indicating the continuous stiffening of the BMG, while both Poisson's ratio and global plasticity decline at low temperatures. It is considered that the stiffer atomic bonds of the Ce-based BMG at low temperatures result in the increase of strength, and the higher energy required for nucleation of shear bands also leads to the increase in yield strength.