喷射成形与铸造7A60合金的微观组织对比研究

Comparisions of Microstructures of Spray Deposited and Cast 7A60 Alloy

摘要:

利用喷射成形技术制备了7A60合金。借助扫描电镜（SEM），透射电镜（TEM），X射线衍射（XRD）等手段研究了喷射成形与铸造7A60合金微观组织的特点。结果表明，铸造7A60合金的组织粗大，偏析严重。喷射成形7A60合金主要由细化的等轴晶组成，无明显偏析。与传统铸锭冶金工艺相比，喷射成形工艺大大提高了冷却速率，显著细化了7A60合金的微观组织。

Abstract:

7A60 alloys were prepared by spray deposition and casting techniques. The microstructures of the spray deposited and cast 7A60 alloys were studied using scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. The results indicate that the cast 7A60 alloy exhibits coarse grains and macrosegregation. The microstructure of the spray-deposited Al-Zn-Mg-Cu alloy is composed of the refined, equiaxial grains without obvious segration. Compared with the traditional technique, the spray deposition technique increased cooling rate greatly, refine the microstructure of 7A60 alloy obviously.