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研究了4mm厚AZ31镁合金板材搅拌摩擦加工工艺。在加工速度为100mm/min,转速为500～1500r/min条件下获得了表面平整、无宏观缺陷的加工面。搅拌区的晶粒尺寸相对于母材得到了明显的细化,并且随着转速的增加,搅拌区的晶粒逐渐增大,显微硬度逐渐降低,符合霍尔-佩齐公式。在应变速率为5×10-3s-1的条件下了进行室温拉伸,结果发现,加工后搅拌区细晶组织的抗拉强度相对于母材有所降低,但伸长率得到提高。
The friction stir processing technology of 4mm thick AZ31 magnesium alloy sheet was studied. Under the condition of the processing speed of 100mm / min and the rotating speed of 500 ~ 1500r / min, the machined surface with no surface defects and no surface defects was obtained. The grain size of the stirring zone was obviously refined compared with that of the base metal. With the increase of the rotating speed, the grains in the stirring zone gradually increased and the microhardness decreased gradually, which accorded with the Hall-Peyzer formula. As a result of stretching at room temperature under a strain rate of 5x10-3s-1, it was found that the tensile strength of the fine-grained structure in the kneading zone after working decreased relative to the base material, but the elongation was improved.