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研究固溶和时效热处理工艺对铸态 ZK60 镁合金显微组织与力学性能的影响。结果表明,当固溶处理条件为400 °C下保温10h、时效处理温度为150 °C时,ZK60合金中析出相随时效时间的延长而增加,直至30h。当时效温度升至 200 °C时,析出相体积分数在时效时间为15～20h时达到最大值。室温拉伸实验表明,高密度第二相析出物有利于提高合金的强度和塑性。优化的热处理工艺条件为400 °C固溶10h随后于 150 °C时效 30h,得到的镁合金兼具有高的强度与塑性综合性能。
The effects of solid solution and aging heat treatment on the microstructure and mechanical properties of as-cast ZK60 magnesium alloy were studied. The results show that when the solution treatment conditions 400 ° C for 10h, aging treatment temperature of 150 ° C, precipitation of ZK60 alloy increased with the aging time until 30h. When the aging temperature rises to 200 ° C, the precipitated phase volume fraction reaches the maximum when the aging time is 15 ~ 20h. Tensile tests at room temperature show that high-density second phase precipitates are good for increasing the strength and ductility of the alloy. Optimized heat treatment process conditions for the 400 ° C solution 10h and then aging at 150 ° C 30h, the resulting magnesium alloy with both high strength and plastic properties.