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利用搅拌摩擦加工技术,研究了不同工艺对AZ31镁合金显微组织和拉伸性能的影响。结果表明:当进给速度为200、400 mm/min、搅拌针转速低于1000r/min时,AZ31镁合金的显微组织由于发生动态再结晶,获得了均匀细小的等轴晶,平均晶粒尺寸小于7μm。随着搅拌针转速提高,该合金显微组织不断粗化。与母材相比,经搅拌摩擦加工后,AZ31镁合金的应变强化效应明显增强,塑性明显提高,但屈服强度有所降低。采用搅拌速度600 r/min、进给速度400mm/min,工艺FSP处理后,该合金获得了最佳的综合力学性能。
The effect of different technology on the microstructure and tensile properties of AZ31 magnesium alloy was studied by friction stir processing. The results show that when the feed speed is 200,400 mm / min and the rotation speed of the needle is less than 1000 r / min, the microstructure of AZ31 magnesium alloy is characterized by uniform dynamic microstructure, uniform and fine equiaxed grains, The size is less than 7μm. As the speed of the stirring pin increases, the microstructure of the alloy is continuously roughened. Compared with the base metal, after the friction stir processing, AZ31 magnesium alloy strain strengthening effect was significantly enhanced, plastic significantly improved, but the yield strength decreased. The optimum mechanical properties of the alloy were obtained with the stirring speed of 600 r / min and the feed speed of 400 mm / min.