为了改善汽车缸盖脱模挤压后的组织与性能,采用不同的淬火介质温度对缸盖挤压件进行热处理,并分析淬火介质温度对缸盖挤压件稀土镁合金的显微组织、物相组成及力学性能的影响。结果表明,随淬火介质温度从20℃升高至80℃,合金的晶粒先细化后粗化,其力学性能也随之先提高后下降;但合金的物相组成未发生明显变化。 In order to improve the structure and performance of the automobile cylinder head after demoulding and extrusion, different temperature of quenching medium is used to heat treat the cylinder head extrusion, and the microstructure of the rare earth magnesium alloy of cylinder head extrusion is analyzed. Phase composition and mechanical properties. The results show that as the temperature of quenching medium increases from 20 ℃ to 80 ℃, the grain size of alloy increases and then decreases. However, the phase composition of the alloy does not change obviously.