A maximum temperature rise model of the shear band in bulk metallic glasses

Based on mechanisms applicable to bulk metallic glasses (BMGs), such as a superposition principle of an instantaneous finite surface heat source temperature field and a flow model about the shear-band velocity, a maximum temperature rise model of shear bands in BMGs was deduced, Δ T max = σ y c p Δ u p l · v SB 2 π α . The model describes the dependence of the maximum temperature rise on the yield strength and the shear-band velocity in BMGs. It can be calculated that the maximum temperature rise of BMGs is between 1 K ∼ 30 K at room temperature through these two parameters. A critical temperature, T C , of almost 0.8 ∼ 0.9 T g is introduced, at T < T C , the change of the yield strength with temperature in BMGs basically conforms a cooperative shear model (CSM), and at T > T C , a significant reduction of the yield strength in BMGs can be attributed to avoiding failure due to localized material softening.