通过拉伸试验和胀形试验研究了不同温度下AZ31B镁合金挤压管材的成形性能。结果表明，随着温度的升高，管材的轴向拉伸成形性能有明显提高，但是其胀形性能并没有相应变化。这主要是因为挤压管材存在明显的各向异性，在环向的变形性能明显低于轴向。另外，采用分流模挤压的管材，在加热时焊缝成为最容易破裂的部位，出现了提前破裂，降低了管材的整体变形性能。
The formability of AZ31B magnesium alloy extruded tube was investigated by tension test and hydrobulging test. The result show that with the increase of temperature, the tension property along the extrusion direction increased significantly, while the maximum hydrobulging ratio did not change accordingly. The anisotropy induced by extrusion process is one of the main reasons for the difference of properties in axial direction and hoop direction. The extrusion weld line became the position where fracture will first occur, especially at elevated temperature. This acts as another important factor that decreases the formability of the extruded tube during hydrobulging.
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