Abstract

Extrusion temperature can significantly influence grain size, the shape of second phase particles and the dislocation distribution of Mg alloys. In this study, the effects of extrusion temperatures ranging from 250 to 400 °C on the microstructure, mechanical properties and corrosion resistance of a Mg-Al-Ca alloy with 1.61 wt.% Al and 1.76 wt.% Ca (Mg-1.61Al-1.76Ca) were investigated. The results showed that the size of grains and phases increased with an increase in extrusion temperature; the yield strength and ultimate tensile strength values decreased with an increase in temperature, while the fracture elongation increased initially (up to 300 °C) and decreased thereafter with an increase in temperature. Under test, the extruded alloy exhibited some evidence of corrosion at 250 °C, while extrusion at 300 °C demonstrated better corrosion resistance. Thus, the 300 °C extruded alloy possessed the optimum comprehensive performance because of the relatively small grains, fine second phase particles and fewer dislocations.

中文翻译：

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Mg-1.61Al-1.76Ca合金在不同挤压温度下的组织，力学性能和腐蚀性能

摘要

挤压温度会显着影响晶粒尺寸，第二相颗粒的形状和Mg合金的位错分布。在这项研究中，挤压温度在250至400°C范围内对具有1.61 wt％的Al和1.76 wt。％的Ca（Mg-1.61Al的Mg-Al-Ca合金的组织，力学性能和耐蚀性的影响-1.76Ca）。结果表明，随着挤压温度的升高，晶粒和相的尺寸增大。屈服强度和极限抗拉强度值随温度升高而降低，而断裂伸长率最初升高（最高300°C），随温度升高而降低。在测试中，挤压合金在250°C时显示出腐蚀迹象，而在300°C下挤出则显示出更好的耐腐蚀性。因此，300℃挤压合金具有最佳的综合性能，因为它具有相对较小的晶粒，细小的第二相颗粒和较少的位错。