Research Progress of Melting and Solidification Forming Technology for Al-Li Alloy
Al-Li alloys,as a new type of aerospace material,have a wide range of application prospects due to their advantages of low density,high specific strength and specific stiffness.Existing research on Al-Li alloys focuses on microalloying and hot processing(e.g.,hot extrusion,heat treatment),but neglects the fact that the quality of the original Al-Li alloy ingot prior to the hot processing step also has a great impact on the final properties of the alloy.However,not much research has been done on the melting and solidification forming technologies for Al-Li alloy ingots.Therefore,the preparation techniques of Al-Li alloy ingots in both high-vacuum and non-vacuum environments,including spray forming,powder metallurgy,and ultrasonic-assisted extrusion casting forming process,were reviewed and summarized.The advantages and disadvantages of these technologies were analyzed,and some new ideas or prospects for the preparation of Al-Li alloy ingots were proposed.