对Mg-8Gd-4.8Y-0.4Zr合金在不同挤压比下进行挤压，并在不同温度对挤压制得合金进行时效处理，通过透射电子显微镜（TEM）分析了挤压及时效后合金的微观组织。结果表明：合金在挤压过程中发生完全动态再结晶，合金内部分解出β″相，在峰时效时合金内部同时含有β′相与β″相；合金在380℃挤压时，挤压比增大，合金的强度与塑性均提高，在220℃时效21 h，合金的屈服强度最高。
Mg-8Gd-4.8Y-0.4Zr alloy was extruded with different extrusion ratios,and then aged at different temperatures. Transmission electron microscope (TEM) was used to characterize the microstructures of as-extruded and aged alloys. The results show that complete dynamic recrystallization(DRX)occurs andβ″phase precipitates during extrusion.β″phase andβ′phase coexist in the peak aged alloy. When extruded at 380℃,as the extrusion ratio increases,both strength and elongation of alloy increase. When aged at 220℃for 21 h,the highest yield strength is obtained.
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