变形镁合金丝成形工艺的研究现状与展望

Research Progress and Prospect of the Manufacturing Technology for Magnesium Alloys Wires

综述了镁合金的塑性成形工艺性能、镁合金丝成形工艺方法的研究现状和镁合金丝成形工艺的发展趋势。形变温度、载荷形式和晶粒尺寸对镁合金的塑性变形能力影响很大;通过升高温度和使镁合金处于三向压应力状态可以显著提高镁合金的塑性,因此热挤压是一种可行的镁合金丝塑性成形方法;拉拔成形过程中的应力状态对镁合金的塑性发挥不利,但在镁合金丝拉拔过程中引入电磁场、电脉冲等外场可以使镁合金的温度快速升高、晶粒细化,从而大幅提高镁合金的塑性,外场作用下生产效率极高的拉拔成形新技术是未来镁合金丝成形工艺的研究与发展方向。

The plasticity processing property of magnesium alloys, the latest developments and the trend of magnesium alloys wires formation technique are explored. The plasticity of magnesium alloys is greatly affected by the deformation temperature, load form and grain size. The plasticity of magnesium alloys can be obviously improved in three dimensional compressive stress states and by increasing the deformation temperature, so the hot extrusion is a feasible plastic forming method of magnesium alloy wires. Although the tensile stress states during extrusion forming process puts the plasticity of magnesium alloys at a disadvantage, the temperature of magnesium alloys can be quickly increased and the grain size of magnesium alloys can be greatly refined under the action of external fields, so the plas- ticity of magnesium alloys can be obviously improved. As a result, the trend of magnesium alloys wires formation technique lied in the new drawing technique under the action of external fields.