一、前言 随着新机飞行性能不断改进,其方向是动力装置的推力-体积比和推力-重量比不断增加,随之带来工作温度的增高。某些原来由镁合金铸造的机匣零件和结构件的工作温度可能超过250℃,甚至达到300℃以上。我国现有的镁-稀土系热强铸造镁合金ZM3、ZM4、ZM6,其使用温度最高不超过250℃,不能满足上述发展的需要。 I. INTRODUCTION As the performance of new aircraft continues to improve, its direction is that the thrust-to-volume ratio and thrust-to-weight ratio of the power plant are constantly increasing, which in turn leads to an increase in operating temperature. Some of the original magnesium alloy casting parts and structural parts of the casing temperature may exceed 250 ℃, and even up to 300 ℃ above. China’s existing magnesium - rare earth hot-cast magnesium alloy ZM3, ZM4, ZM6, the maximum temperature does not exceed 250 ℃, can not meet the needs of the development.