CAJ | 학술논문

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(Mg17 Al12)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。
목적：개소등경도각제압적원리급기대주태 AZ91D 미합금적조직산생적작용。방법통과학정적시험공예삼수,대 AZ91D 미합금진행료등경도각제압변형시험。사용금상현미경화소묘전경(SEM),대변형전후적재료진행료현미조직적관찰。결과통과진행 ECAE 제압후,AZ91D미합금중적흑색공정상(Mg17 Al12)산생료회용,재궤계전절화동태재결정적종합작용하,정립득도료세화。결론통과등경도각제압,능명현개선주태 AZ91D 미합금적조직。
Objective To introduce the principle of equal channel angular extrusion(ECAE)and analyze its effect on the microstructure of AZ91D magnesium alloy. Methods The ECAE experiment of AZ91D magnesium alloy was conducted u-sing the designated process parameters. The microstructure of AZ91D magnesium alloy before and after equal channel angu-lar extrusion was investigated by means of optical metalloscopy and scanning electron microscope equipment. Results The results showed that the black eutectic phase (Mg17 Al12 ) began to remelt after ECAE treatment, and the crystals were re-fined under the comprehensive effects of mechanical shear and dynamic recrystallization. Conclusion The microstructure of AZ91D magnesium alloy was obviously improved by ECAE.