Dynamic Deformation Mechanism Transformation and Constitutive Equation Modification of ZEK610 Alloy

IF 3.3 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Metals and Materials International Pub Date : 2024-08-01 DOI:10.1007/s12540-024-01741-6

Chenkun Xu, Le Zhou, Zhi Wang, Feng Wang, Weihan Zhang, Ziqi Wei, Pingli Mao

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Abstract

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 (Mg_1 − xZn_x) 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.

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ZEK610 合金的动态变形机理转换和构造方程修正

采用热挤压剪切技术制造了 Mg-6Zn-1Ce-0.6Zr (ZEK610) 合金，该合金主要由 α-Mg 基体、Mg7Zn3 相和（Mg1 - xZnx）11Ce 相组成。对该合金进行了各种应变速率下的动态压缩实验。合金表现出典型的正应变强化效应，在应变率为 2500s- 1 时，屈服强度和峰值应力分别达到 243Mp 和 622Mp。随着应变速率的增加，合金的主要变形机制从{10\(\stackrel{-}{1}\)2}拉伸缠绕转变为棱柱滑移。这一现象归因于吸收能量密度和绝热温度对应变速率增量的敏感性增加。修改约翰逊-库克（Johnson-Cook）构成模型后，可以更准确地预测合金在室温下的动态压缩特性，因为从修改后的方程得出的曲线与实验曲线非常吻合。

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

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.