High Temperature Microstructural Stability of Si3N4 in TiAl Alloys
Alloys of Ti-50 at.% Al with (3 and 10)wt.% Si3N4 particles were prepared by a mechanical alloying-spark plasma sintering (MA-SPS) method. The matrix consisted primarily of TiAl, Ti2AlN, TiN. Si3N4 was unstable in the matrix and started to decompose forming a Ti5Si3 reaction layer on the surface of former Si3N4 particles during sintering and heat treatment at 1373 K.
Duk Yong Yoon, Suk-Joong L. Kang, Kwang Yong Eun and Yong-Seog Kim
J. H. Choi and D. B. Lee, "High Temperature Microstructural Stability of Si3N4 in TiAl Alloys", Materials Science Forum, Vols. 534-536, pp. 1577-1580, 2007