挤压工艺对ME20M镁合金组织和力学性能的影响

Effect of extrusion process on microstructure and mechanical properties of ME20M magnesium alloy

研究不同挤压工艺条件对ME20M镁合金组织和力学性能的影响。结果表明:挤压工艺参数的变化对ME20M的晶粒尺寸和组织均匀性具有较大的影响,存在主要第二相Mn单质颗粒吸附Mg12Ce现象,其吸附量随Mn颗粒分布位置的变化而变化,造成Mg12Ce分布不均,成为制约ME20M合金组织性能改善的主要因素之一。主要通过合理控温、控速等挤压工艺控制挤压纤维组织的分布与数量,利用其强化作用实现抗拉强度超过250 MPa、伸长率超过10%型材的工业化生产。

The effect of various extrusion process conditions on the microstructure and mechanical properties of ME20M magnesium alloy was studied.The results show that the grain size and structure uniformity of ME20M magnesium alloy are greatly affected by the extrusion process parameters.Furthermore,Mg12Ce can be absorbed by Mn（the main second phase）,and the quantity of absorption varies according to the location of Mn particles.This will lead to non-uniform of Mg12Ce,which greatly restricts the development of the properties of ME20M magnesium alloy.By controlling extruding temperature and speed,the distribution and quantity of fibrous structure can be perfectly controlled.The profile that ultra tensile strength is above 250 MPa and elongation is above 10% can be realized by strengthening the effect of fibrous structure in industry production.