摘要:
为了优化Mg-5Al-1Zn-0.8Ti含钛镁合金的挤压工艺,在不同的挤压温度和挤压速度参数下对试样展开了组织和力学性能的测试与分析。结果表明:挤压温度从325℃增加到425℃,挤压速度由1 m/min提高到5 m/min,试样的平均晶粒尺寸先减小后增大,力学性能先提升后下降。与325℃挤压温度相比,400℃挤压温度下的含钛镁合金试样的平均晶粒尺寸减小了34%,抗拉强度和屈服强度分别增大了24%和29%,断后伸长率减小28%;与1 m/min挤压速度相比,3 m/min挤压速度下试样的平均晶粒尺寸减小了26%,抗拉强度和屈服强度分别增大12%和14%,断后伸长率减小21%。因此,Mg-5Al-1Zn-0.8Ti含钛镁合金的挤压工艺参数优选为:挤压温度400℃、挤压速度3 m/min。
Abstract:
In order to optimize the extrusion process of Mg-5Al-1Zn-0.8Ti magnesium alloy containing titanium, the microstructure and mechanical properties of the samples were tested and analyzed under different extrusion temperatures and extrusion speeds. The results show that with the extrusion temperature increasing from 325 ℃ to 425 ℃ and the extrusion speed increasing from 1 to 5 m/min, the average grain size of the samples decreases first and then increases, and the mechanical properties increase first and then decrease. Compared with the sample extruded at 325 ℃, the average grain size reduces by 34%, the tensile strength and yield strength respectively increase by 24% and 29%, while the elongation after fracture decreases by 28%, for the sample extruded at 400 ℃. Meanwhile, compared with the sample extruded at 1 m/min of speed, the average grain size decreases by 26%, the tensile strength and yield strength separately increase by 12% and 14%, while the elongation after fracture decreases by 21%, for the sample extruded at 3 m/min. The optimum extrusion process parameters of Mg-5Al-1Zn-0.8Ti alloy are determined at 400 ℃and 3 m/min of speed.
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