采用搅拌摩擦加工技术对铸态AZ31镁合金进行单道次加工,研究加工区域的微观组织和力学性能.结果表明:搅拌摩擦加工过程中,材料发生了剧烈的塑性变形,粗大的β-Mg17Al12相显著破碎,形成细小、均匀的再结晶组织.XRD分析表明,搅拌摩擦加工导致大量的β相固溶到镁合金基体中,产生固溶强化作用.搅拌摩擦加工后的试样平均HV硬度值为810 MPa,高于铸态AZ31镁合金的硬度值,抗拉强度比铸态AZ31镁合金提高43 MPa,延伸率提高4.3%,拉伸断口表现为微孔聚合剪切断裂特征.
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