固相合成道次对ZM6-Ce镁合金组织和性能的影响

Effect of Extruding Times on Microstructure and Mechanical Properties of ZM6-Ce Magnesium Alloy

采用固相合成法合成ZM6镁合金废屑和Mg-Ce中间合金屑,研究挤压合成次数对合成镁合金棒组织和性能的影响,并讨论其断裂行为。结果表明:一次挤压后,Mg-Ce中间合金屑没有被破碎,合金的力学性能较差。经5次挤压后,Mg-Ce中间合金屑的均匀分布使合金的力学性能有较大的改善。随着挤压次数的增加,合金的抗拉强度和延伸率增大,增大的幅度随着挤压次数的增加而变小。5次挤压后,合金的抗拉强度为300 MPa,延伸率为14.8%,试样的断裂方式为穿晶韧窝断裂。

A method for recycling ZM6 magnesium alloy chips and Mg-Ce alloy chips by hot extrusion was studied. Effect of extruding times on microstructure and mechanical properties of the alloy was analyzed and the fracture behavior was discussed. The results indicate that after the first extrusion, tensile strength and elongation to failure of the alloy are very low because Mg-Ce intermediate alloy chips have not been broken. Tensile strength and elongation to failure of the alloy are obviously improved because of well-proportioned distribution of Mg-Ce intermediate alloy chips after the fifth extrusion. Ultimate tensile strength and elongation to failure of the alloy increase with the extrusion times increasing. Increasing range decreases with the extrusion times increasing. After the fifth extrusion, ultimate tensile strength and elongation to failure of the alloy are 300 MPa and 14.8%, respectively. Fracture mode of the specimen is transgranular dimple fracture.