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首页> 外文期刊>Materials Science and Engineering >Effects of extrusion parameters on the microstructure and mechanical properties of Mg-Zn-(Mn)-Ce/Gd alloys
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Effects of extrusion parameters on the microstructure and mechanical properties of Mg-Zn-(Mn)-Ce/Gd alloys

机译：挤压参数对Mg-Zn-（Mn）-Ce / Gd合金组织和力学性能的影响

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摘要

The effects of extrusion parameters on the microstructure and tensile properties of the Mg-2Zn-0.5Ce, Mg-1Zn-lMn-0.5Ce, and Mg-2Zn-1.5Gd alloys were investigated by conducting indirect extrusion at different temperatures, ram speeds, and extrusion ratios. All of the extruded alloys exhibited a bimodal grain structure composed of equiaxed fine recrystallized (DRXed) grains and elongated coarse unDRXed grains, except for some alloys extruded at a high temperature and a fast speed. With an increase in the temperature, speed, and ratio of extrusion, the average size and area fraction of the DRXed grains increased as a result of the temperature rise at the deformation zone caused by deformation heating. The yield strength increased with a decrease in the size of the DRXed grains according to the Hall-Petch relation, while the elongation increased with an increase in the fraction of the DRXed grains due to the suppression of {10-ll}-{10-12} double twinning, irrespective of alloy composition. Due to these relationships between the microstructural characteristics and tensile properties, the yield strength decreased but the elongation increased when the temperature, speed, and ratio were increased.
机译：通过在不同温度，冲头速度，不同温度下进行间接挤压研究了挤压参数对Mg-2Zn-0.5Ce，Mg-1Zn-1Mn-0.5Ce和Mg-2Zn-1.5Gd合金的组织和拉伸性能的影响。和挤压比。除了某些在高温和高速下挤压的合金外，所有挤压合金均表现出由等轴细再结晶（DRXed）晶粒和细长的粗未DRX晶粒组成的双峰晶粒结构。随着温度，速度和挤压比的增加，由于变形加热引起的变形区温度升高，DRX晶粒的平均尺寸和面积分数增加。根据Hall-Petch关系，屈服强度随DRXd晶粒尺寸的减小而增加，而伸长率则由于{10-ll}-{10- 12}双孪晶，与合金成分无关。由于微观结构特性和拉伸性能之间的这些关系，当温度，速度和比例增加时，屈服强度降低，而伸长率增加。

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