摘要
目的介绍等径道角挤压的原理及其对铸态AZ91D镁合金的组织产生的作用。方法通过确定的试验工艺参数,对AZ91D镁合金进行了等径道角挤压变形试验。使用金相显微镜和扫描电镜(SEM),对变形前后的材料进行了显微组织的观察。结果通过进行ECAE挤压后,AZ91D镁合金中的黑色共晶相(Mg17Al12)产生了回溶,在机械剪切和动态再结晶的综合作用下,晶粒得到了细化。结论通过等径道角挤压,能明显改善铸态AZ91D镁合金的组织。
Objective To introduce the principle of equal channel angular extrusion（ ECAE） and analyze its effect on the microstructure of AZ91 D magnesium alloy. Methods The ECAE experiment of AZ91 D magnesium alloy was conducted using the designated process parameters. The microstructure of AZ91 D magnesium alloy before and after equal channel angular extrusion was investigated by means of optical metalloscopy and scanning electron microscope equipment. Results The results showed that the black eutectic phase（ Mg17Al12） began to remelt after ECAE treatment,and the crystals were refined under the comprehensive effects of mechanical shear and dynamic recrystallization. Conclusion The microstructure of AZ91 D magnesium alloy was obviously improved by ECAE.
出处
《精密成形工程》
2014年第5期64-68,共5页
Journal of Netshape Forming Engineering
关键词
等径道角挤压
AZ91D
微观组织
工艺参数
equal channel angular extrusion
AZ91D
microstructure
process parameters
