Abstract
In order to solve the problem of serious Al segregation and coarse Ti2AlN particles in as-cast TiAl composites, ultrasonic treatment was selected to further regulate the macro/microstructure and mechanical properties of Ti46Al4Nb1Mo alloy reinforced with Ti2AlN particles, and the effects of ultrasonic treatment time on Ti2AlN/Ti46Al4Nb1Mo composites were investigated in this study. Results showed that when the ultrasonic treatment time increased from 0 to 120 s, the region of shrinkage and γ phase between the lamellar colony was reduced. The shape of Ti2AlN particles changed from plate to ellipsoid, and the coarse Ti2AlN particles with length more than 10 μm gradually became shorter (about 3 μm), especially with the ultrasonic treatment at 120 s. The reduction of shrinkage area, Ti2AlN length and γ size resulted from the increase of nucleation supercooling and melt flow capacity by ultrasonic treatment. Compressive results showed that the maximum strength and strain were 2462 MPa and 28.5% with ultrasonic treatment at 90 s and 120 s, respectively, and the improvement of compressive properties was mainly due to the reduced size of Ti2AlN and γ phase.
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