Compression properties and work-hardening behavior of Ti_2AlC/TiAl composites fabricated by combustion synthesis and hot press consolidation in the Ti-Al-Nb-C system

摘要

The Ti2AlC/TiAl composites are successfully fabricated utilizing the method of the combustion synthesis and hot press consolidation in the Ti-Al-Nb-C system and the effect of the (Nb-C) content on the compression properties and work-hardening behavior of the composites has been investigated. The compression properties and work-hardening capacity of the TiAl alloy improve remarkably with the addition of the (Nb-C) elements due to the formation of Ti_2AlC particles and the solid solution of Nb in the TiAl matrix. The compression properties of the composites increase first then decrease with the increase in the (Nb-C) content and the TiAl-10 wt.% (Nb-C) sample possesses the best comprehensive compression properties and the highest work-hardening capacity.