对挤压态ZK60镁合金进行往复挤压成形,研究往复挤压后材料的显微组织和力学性能变化规律.结果表明,往复挤压的温度和挤压道次对ZK60镁合金力学性能及显微组织有较大影响,随着挤压温度的提高和挤压道次的增加,ZK60镁合金呈现较高的抗拉强度、较低的屈强比和较大的延伸率等,室温塑性变形性能较好.往复挤压使晶粒明显细化,伴随出现再结晶过程,细晶分布具有一定的流向性.随着挤压道次的增加,晶粒等轴倾向明显,细晶分布趋于均匀化.室温拉伸断口形貌韧窝数量与深度均明显增加,变形能力提高显著.
The microstructure and mechanical properties of the extruded ZK60 magnesium alloy by cyclic extrusion and compression (CEC) were studied. The results indicate that the temperature and the passes have great influence on the microstructure and mechanical properties of ZK60 magnesium alloy. With the increase of temperature and passes, ZK60 magnesium alloy shows higher tensile strength, lower yield ratio and larger elongation and so on. Simultaneously, it presents a better performance of plastic deformation at room temperature. After CEC deformation, the microstructure of ZK60 alloy is obviously refined and appears a recrystallization process accordingly. Meanwhile, fine grain distribution has a feature of certain flow direction. With the increase of passes, isometric tendency of grain appears obviously and the fine grain distribution tends to homogenization. The tensile fracture morphology at room temperature shows that with the increase of temperature and passes, the number and the depth of dimples increase obviously and deformation capacity enhances significantly.
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