冷轧制备钛铝合金时界面的扩散及控制

Diffusion and Control of Ti/Al Interface in Preparation of Ti/Al Alloy by Cold Rolling

采用冷轧法制备Al/Ti/Al三层薄板并对其进行退火处理,使用扫描电镜观察了退火前后薄板的Ti/Al界面形貌,使用显微硬度计测量了退火前后薄板中心钛层的显微硬度,并对退火及轧制过程中Ti/Al界面的生长规律进行了探索。退火时界面生长规律表明,扩散层的厚度随着退火温度的增加呈指数增加;在退火时间低于45 min时,扩散层的厚度对时间的变化不敏感,在退火时间大于45 min时,扩散层厚度随着时间变化急剧升高;显微硬度结果表明,轧制后的薄板在580℃保温30 min可基本退火完全;轧制时界面生长规律表明,在道次压下量为5%,退火工艺为580℃、30 min时,界面扩散层可随着轧制过程压延变形,其厚度可控制在0.8μm左右。

The Al/Ti/Al sheet was prepared by cold rolling and it was annealed under different processes.The morphology of the Ti/Al interface before and after annealing was observed with a scanning electron microscope.The microhardness of the titanium layer was measured with a microhardness,and the growth rule of the Ti/Al interface during the annealing and rolling process was explored.The rules of interfacial growth show that the thickness of diffusion layer increases exponentially with the increase of annealing temperature.When the annealing time is less than 45 min,the thickness of the diffusion layer is not sensitive to the time.However,with the annealing time more than 45 min,the thickness of the diffusion layer increases sharply with the time.The microhardness results show that the rolled sheet could be basically annealed at 580℃for 30 min.At the rolling reduction of 5%and annealing temperature of 580℃for 30 min,the interface diffusion layer can be deformed with the rolling process with the thickness controlled at about 0.8μm.