Integrally-bladed-rotors (IBRs) and Blisks have emerged as an attractive approach of construction of axial compressors and turbines for advanced aeroengines, which significantly improves the performance of aeroengines. Extensive attentions have been on the development of manufacture and joint technologies of IBRs for aeroengines. Alloys of titanium and nickel base superalloys have long been used as compressor disc and blade materials for both small and large gas turbine engines. The more advanced engine use IBRs throughout the compression section to reduce weight and improve performance. However, integral blade-to-disk design inherently limits the ability of conventional manufacturing process to affordably produce IBRs, thus the costs for those components have remained high. The overall objective of the program is to develop an innovative low-cost powder metallurgy (P/M) process for the production of near net shape (NNS) bi-metallic integral bladed rotors (IBRs) components with improved functional properties at elevated temperatures, in which the blades are TiAl titanium aluminides (a high temperature resistant material) and the hub and flange are a titanium alloy (a high fracture toughness material).