Strain measurement in individual phases of multiphase materials during thermo-mechanical loading

This is the final report for a 3-year project. Employment of metal matrix and ceramic composites in high-technology aerospace applications or as lighter (more economic) material in the auto industry requires the development of analytical methods capable of predicting durability, debonding, and damage tolerance during mechanical and thermal loads expected in service. Neutron diffraction has been used to measure residual stress in composites, steels, and compacted powders. We have extended our capability by acquiring a stress rig with a furnace to make in-situ measurements of materials response. This permits measurements on technologically important materials under conditions close to service. Studies address Al/TiC and Al/SiC composites (under consideration for automotive use), MoSi{sub 2}, and NiTi/TiC composite