SOLIDIFICATION PHASE SELECTION IN DIRECTIONALLY SOLIDIFIED Ti-(44%-54%)Al ALLOYS

作者：Li Xinzhong^*; Sun Tao; Yu Caixia; Su Yanqing; Cao Yongzhi; Guo Jingjie; Fu Hengzhi

来源：Acta Metallurgica Sinica, 2009, 45(12): 1479-1486.

• Ti-Al alloy
• directional solidification
• phase selection

Directional solidification experiments were conducted for Ti-(44%-54%)Al (atomic fraction) alloys in a wide range of ratios between temperature gradients and growth rates. Interfacial morphology evolution, microstructure formation and the final lamellar orientations were investigated under different solidification conditions. Nucleation and compositional undercooling criterion were used to calculate the phase selection map for Ti-Al alloys which gives phases and corresponding microstructures at different initial compositions and solidification parameters. The map is in good agreement with the experimental results and gives important criteria for determing phase compositions and solidification parameters in lamellar orientation control of Ti-Al alloys.

• 出版日期2009-12-11
• 单位哈尔滨工业大学