Shear band velocity and activation volume during shear deformation by acoustic emission in a Zr-based bulk metallic glass
Source abstract
Abstract
An analysis is presented for the shear band velocity of plastic deformation and activation volume of the shear transformation zone (STZ) in a Zr 60Cu 30Al 10 bulk metallic glass (BMG). Compared to the values calculated by the stick-slip model, the values of shear band velocity calculated after optimization by the acoustic emission technique are much larger than those reported previously. Plastic flow in BMGs is found to be described by a power-law correlation between the maximum velocity of the shear band and the strain rates. Combining the free volume theory and the STZ theory, the relationship between the volume change in the STZ and the shear band velocity is derived as Ω = A ( 27 − ln v / l ) . The value of A, which is a material dependent constant, is 5.43 × 10 −3 for the current BMG at room temperature.
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Research context
OpenAlex topics: Metallic Glasses and Amorphous Alloys
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References (43)
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