目的：得到综合力学性能良好的AZ31镁合金Φ8 mm薄壁管材。方法研究了热挤压、等温挤压与反向温度场挤压3种工艺对AZ31镁合金薄壁管材晶粒组织和力学性能的影响。结果热挤压管材组织不均匀，头部晶粒粗大、尾部细小，等温挤压和反向温度场管材挤压组织较为均匀。结论反向温度场挤压在模具温度为300℃、坯料温度为20℃条件下，薄壁管材抗拉强度达278 MPa，伸长率达20.1%，综合力学性能最佳。%ABSTRACT:In order to obtain AZ31 alloy thin tubes ofΦ8 mm with good mechanical properties,that focused on the effect of grain microstructure and mechanical properties of the as-extruded thin tubes of AZ31 magnesium alloy by hot extrusion,and un-thermal extrusion. Studies have found that microstructure of hot extrusion is uneven,head grains were coarse,the tail grains were relatively small,and the others were well-proportioned. With comparison of The Three mechanical performance,it got the best tube tensile strength of about 278 MPa,elongation of about 20.1%,when un-thermal extrusion is in the mold temperature of 300℃,billet temperature is 20℃.
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