Synthesis of Cf/TiAl3 Composite by Infiltration-In Situ Reaction

Abstract

Abstract:

Infiltration-in situ reaction synthesis of Cf/TiAl₃ composite was investigated. The as-cast material was obtained by titanium particles, carbon fibers and pure aluminum. Titanium particles and carbon fibers were mixed and pressed to form a preform firstly, and then molten pure aluminum was pressed into the preform, subsequently, cooled rapidly. In situ reaction samples were obtained by heating the as-cast material from 600 to 1000°C for 1 h. The microstructural evolution of in situ reaction samples was analyzed by scanning electron microscopy and energy dispersive X-ray. In addition, the phase composition of products was inspected by X-ray diffraction. Experimental results showed that the dominant product of TiAl₃ and a small amount of Al₄C₃ were formed at low temperature. While TiAl₃ was not stable at high temperature, along with its decrease, TiC phase became favorable. In the final products, TiAl₃, TiC and Al₄C₃ were detected. Thus, the in situ reaction for Ti-Al-C system composite proceeded a formed-decomposed-precipitated mechanism.

Key words: Composites, Ti-Al Intermetallics, In situ reaction, Microstructure

Yanmei Liu,Ziyang Xiu,Yongliang Guo,Longtao Jiang,Wensu Yang,Gaohui Wu. Synthesis of Cf/TiAl₃ Composite by Infiltration-In Situ Reaction[J]. J Mater Sci Technol, 2009, 25(06): 803-806.

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Synthesis of Cf/TiAl₃ Composite by Infiltration-In Situ Reaction

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