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以不同硅含量(0.5%、1.5%)的Mg-Al-Si合金为原料,在自制的120°转角的等通道转角模具中,以Bc路径进行多道次等通道挤压实验,研究挤压工艺对镁合金组织及力学性能的影响。实验发现:在料温为400℃,模具温度为380~400℃时,可以挤压出宏观无裂纹,外形完整,微观组织趋向均匀且存在Mg2Si相的试样;与原始铸态尺寸50~100μm相比,随挤压次数增加,多次挤压后晶粒明显细化,并且组织更加均匀。从力学性能对比发现,挤压后试样的硬度、抗拉强度和伸长率随挤压次数增加明显增加;拉伸断口呈韧窝状,随着挤压道次的增加,韧窝尺寸减小,韧窝数量增多,塑性增加。
In the homemade 120 ° rotation isosceles corner mold with different silicon content (0.5%, 1.5%) as the raw material, multi-pass equal-pass extrusion experiments were carried out with the Bc path to study the extrusion Effect of Technology on Microstructure and Mechanical Properties of Magnesium Alloy. The experimental results show that when the temperature of the material is 400 ℃ and the temperature of the mold is 380-400 ℃, macroscopically no cracks, complete shape and uniform microstructure with Mg2Si phase can be extruded. Compared with the original as-cast size of 50 ~ 100μm Compared with the increase in the number of extrusion, the number of grains after extrusion significantly refined, and the organization more evenly. From the comparison of mechanical properties, it is found that the hardness, tensile strength and elongation of the sample after extrusion are increased obviously with the increase of the number of extrusion. The tensile fracture is dimpled. With the increase of extrusion pass, the dimple size decreases , The number of dimples increased, the plasticity increased.