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High-energy synchrotron x-rays are used to track grain rotations and themicromechanical evolution of a hexagonal Ti-7Al microstructure as it iscyclically loaded below its macroscopic yield stress. The evolution of thegrains through 200 cycles reveals a continual change in von Mises stress andorientation across the entire specimen indicating a slow accumulation ofplasticity even though the sample was cycled below its macroscopic yield. Grainreorientation is consistent with the development of a tension texture despitethe negligible magnitude of (macroscopic) plastic strain. It is observed thatgrains in a "hard" orientation (c-axis close to the loading direction) retainmore residual stress on their slip systems upon unloading than the grains in a"soft" orientation.

Three-Dimensional In Situ Texture Development and Plasticity Accumulation in the Cyclic Loading of an alpha-Ti Alloy