Preparation of Ti-Al Intermetallics by Aluminum Melt Infiltration-Diffusion Annealing Technique
A novel process, of melt infiltration combined with diffusion annealing technique, was developed to prepare Ti-Al intermetallics at temperature lower than ingot melting point. In this process, a porous Ti preform was firstly fabricated and the Al melt was reheated to temperature slightly higher than Al melting point to infiltrate the porous Ti preform by capillary force spontaneously. After long-time high-temperature diffusion annealing, Ti-Al intermetallic compound can be finally synthesized from the bulk Tip+melt Al via diffusion. As example, Ti-46Al intermetallics has been fabricated, and the microstructures and the phases of the as-synthesized intermetallics were characterized by XRD and SEM. The compressive behavior of the as-synthesized Ti-Al at elevated temperatures has been studied and the reaction mechanism involved in the process finally analyzed.
Young Won Chang, Nack J. Kim and Chong Soo Lee
L. Q. Chen et al., "Preparation of Ti-Al Intermetallics by Aluminum Melt Infiltration-Diffusion Annealing Technique", Materials Science Forum, Vols. 561-565, pp. 367-370, 2007