2024 Volume 65 Issue 2 Pages 199-204
The gas atomization is a production technique of a metallic powder. In this study, the β-solidifying Ti–44Al–6Nb–1.2Cr alloy powder fabricated by gas-atomization was investigated regarding the evolving shape, phase constitution, and chemical distribution as a result of the high solidification rate. The powder showed a spherical shape regardless of its size, indicating no relation of solidification rate to powder shape. However, the small powder (D50 = 36.0 µm) showed less segregation and was composed of β and α2 dual phases. Whereas, the large powder (D50 = 78.7 µm) is relatively high segregation and composed of almost a single α2 phase because of the difference in the cooling rates. The findings obtained here demonstrated the understanding of phase transformation during the rapid solidification and continuous microstructural evolution process in the β-solidifying alloy.
