变形镁合金触变锻造研究

Study on the thixo-forging of wrought magnesium alloy

采用机械搅拌法制备半固态变形镁合金,并设计制造了触变塑性成形装置,进行了变形镁合金触变锻造和常规锻造实验。采用所建立的半固态镁合金本构关系,对触变锻造进行了数值模拟,得到了成形过程中的应力和应变分布,对比了触变锻造和常规锻造的成形特点。结果表明,变形镁合金触变锻造具有变形抗力小、应力分布均匀的特点。通过实验和模拟结果对比可知,两者吻合较好,所获结果可指导变形镁合金触变锻造工艺实践。

The semi-solid wrought magnesium alloy was fabricated by mechanical stirring method. Thixo-forging set-up were designed and made. The traditional forging and thixo-forging processes of AZ61 magnesium alloy were studied with both computer numerical simulation and experimental methods. The constitutive model of semi solid AZ61 alloy was established in our prior literature. The differences between traditional foging and thixo-forging processes were analyzed, and the following results have been obtained. The deformation resistance in thixo forging process was smaller than that in traditional forging process. The effective stress of workpiece in thixo-forging process was well distributed. Numerical simulation results were accorded with experimental ones, which provided for the practice production as theory bases.