D. J. Evans, P. Martin, Air Force Research Laboratory, Wright-Patterson AFB, OH; P. Collins, Center for Accelerated Maturation of Materials, Columbus, OH; D. Huber, R. Banerjee, H. L. Fraser, The Ohio State University, Columbus, OH

Summary:

The chemistry of the alloy Timetal 21S has been selected as a baseline chemistry for the development of a new high temperature beta titanium alloy. A combinatorial approach has been used to rapidly develop the new alloy. This combinatorial approach consists of employing directed laser deposition of blends of elemental powders in order to rapidly process test alloys of varying compositions. Subsequently, mechanical testing and microstructural characterization of these alloys has been carried out to populate databases that will be used for training and testing fuzzy logic based models for predicting the mechanical properties. These models will also be used to optimize the alloy composition for specific property requirements. In addition to varying the amounts of the base elements (Ti, Mo, Nb, Al, and Si), a variety of additional elements are also being tested as potential alloying additions. These include neutral elements (Zr and Sn), b stabilizers (W), and dispersoid formers (C and B). Based on the results of the coupled mechanical tests and computer models, a new group of alloys for application in high temperature thermal protection systems are being developed.