通过对均匀化退火后的AZ91镁合金热挤压以及随后的时效处理, 分析了形变 及时效过程对材料组织与性能的影响. 结果表明: AZ91镁合金在320和380℃挤压 时发生了动态再结晶, 组织比铸态细化, 力学性能大幅度提高; 随后的时 效处理进一步提高了挤压镁合金的力学性能. 经380℃挤压及200℃, 10 h的时效 处理后, 其抗拉强度σb$可达357 MPa, 延伸率δ达8％。
Microstructures and mechanical properties of AZ91 magnesium alloy after homogenized, hot extrusion and succedent aging are investigated. The results show that dynamic recrystallization occurs during extrusion at elevated temperatures of 320℃ and 380℃; compared to the as-cast alloy, microstructures of the extruded AZ91 alloy are refined, and the mechanical properties are enhanced remarkably; succedent aging is helpful to improvement of mechanical properties of the extruded AZ91 alloy. In this experiment, the ultimate tensile strength of the AZ91 alloy extruded at 380℃and aged at 200℃×10h is about 357MPa, and the elongation of the alloy reaches about 8%.
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