The phases and microstructures in-situ formed by solid-state reaction were studied after the elements of B, C and Si were single and mixed doped to the TiAl-based alloys. The results showed that, in the Ti-Al-B alloys, the phases of TiAl, Ti3Al, and ��TiB2�� were formed; in the Ti-Al-Si alloys, the phases ofTiAl, Ti3Al and ��Ti5(Al, Si)3�� were formed; in the Ti-Al-C alloys, the phases of TiAl and Ti3AlC were formed; in the Ti-Al-B-Si alloys, the phases of TiAl, Ti3Al, TiB2 and ��Ti5(Al, Si)3�� were formed; in the Ti-Al-B-C alloys, the phases of TiAl, TiB2 and Ti3AlC were formed; Finally, in the Ti-Al-B-C-Si alloys, besides the TiAl phases, the phases of partice ��TiB2,�� acicular TiB2, lath Ti3AlC and massive Ti5(Al,Si)3 all appeared, and this microstructure was approximately the same as pre-designed, therefore an optimized property is expected.
LI Jian-guo, ZHANG Fu-xiang, WANG Li-jun, ZHANG Yong-gang.Microstructures of Multi-phase Materials In-situ Formed in γ-TiAl��Based Alloys[J] JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2000,V26(5): 501-504
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