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对铸态AZ31镁合金进行单道次和双道次搅拌摩擦加工,对其微观组织和力学性能进行研究。结果表明:铸态AZ31镁合金搅拌摩擦加工后,共晶网状β-Mg17Al12相破碎并发生固溶,微观组织显著细化和均匀化。AZ31镁合金母材和单道次搅拌摩擦加工后的试样没有择优取向,而双道次搅拌摩擦加工后的试样存在择优取向,其(0002)基平面与试样表面平行。单道次和双道次搅拌摩擦加工后试样的抗拉强度分别提高了43和82MPa,延伸率提高了4.3%和11.9%。搅拌摩擦加工后试样的拉伸断口表现为韧性断裂特征。
The as-cast AZ31 magnesium alloy was subjected to one-pass and two-pass friction stir processing, and its microstructure and mechanical properties were studied. The results show that the eutectic β-Mg17Al12 phase breaks and solidifies after the friction stir processing of the as-cast AZ31 magnesium alloy. The microstructure is remarkably refined and homogenized. AZ31 magnesium alloy base metal and single-pass friction stir processing of the sample has no preferred orientation, and two-pass friction stir specimens preferentially oriented, the (0002) base plane and the sample surface parallel. The tensile strength of single-pass and double-pass friction stir tests increased by 43 and 82 MPa respectively, and the elongation increased by 4.3% and 11.9% respectively. Tensile fracture of the sample after friction stir processing shows the characteristics of ductile fracture.