Chenkun Xu, Le Zhou, Zhi Wang, Feng Wang, Weihan Zhang, Ziqi Wei, Pingli Mao
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Dynamic Deformation Mechanism Transformation and Constitutive Equation Modification of ZEK610 Alloy
The hot extrusion shear technique was employed to fabricate the Mg-6Zn-1Ce-0.6Zr (ZEK610) alloy, primarily composed of α-Mg matrix, Mg7Zn3 phase, and (Mg1 − xZnx) 11Ce phase. Dynamic compression experiments at various strain rates were conducted on the alloy. The alloy exhibits a typical positive strain strengthening effect, with the yield strength and peak stress reaching 243Mp and 622Mp at 2500s− 1 strain rate. The dominant deformation mechanism of the alloy transforms from {10\(\stackrel{-}{1}\)2} tensile twining to prismatic slip as the strain rate increases. This phenomenon is attributed to the increased sensitivity of both the absorbed energy density and the adiabatic temperature to strain rate increments. After modifying the Johnson-Cook constitutive model, it was possible to more accurately predict the dynamic compression properties of the alloy at room temperature, as the curves derived from the modified equations closely matched the experimental curves.
期刊介绍：
Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
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