Abstract
The adiabatic shear bands (ASBs) mechanism and adiabatic shear sensitivity of extrusion shearing Mg-6Zn-1Cu-0.6Zr (ZC61) alloy before and after solid-solution treatment are studied at 200oC and strain rate of 2100s-1 using electron backscattered diffraction (EBSD) and transmission electron microscope (TEM) techniques. The experimental results show that {101̅1}-{101̅2} contraction-extension secondary twinning mechanism with high critical resolved shear stress (CRSS) provides sufficient energy for the formation of adiabatic shear bands in extrusion shearing ZC61 alloy and solid solution treatment ZC61 alloy. In addition, the accumulation of dislocations in precipitated phases and the bulging of grain boundary are also reasons for promoting the formation of dynamic recrystallization in the shear band region. Meanwhile, the solid solution treatment effectively reduces the adiabatic shear sensitivity of extrusion-shearing ZC61 alloy due to the lattice distortion caused by the dissolved Zn element, which increases the CRSS of basal slip, leading to improve the intrinsic plasticity of material after solid solution treatment.
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