Textural Development of AA 5754 Sheet Deformed under In-Plane Biaxial Tension

Crystallographic texture evolution was quantified as a function of biaxial strain level and strain path for AA5754-O sheet metal in an effort to provide a physical description of grain rotation resulting from in-plane stretching. Samples were incrementally deformed to near-failure in three strain states (equibiaxial, plane strain, and uniaxial modes) with the rolling direction (RD) and transverse direction (TD) of the sheet parallel to the major stress axis for the latter two cases. The macrotextures were measured using X-ray diffraction techniques. Results showed that for a given strain path similar deformation textures developed in the two material sets (RD- and TD-oriented samples), though the evolution of the deformed texture was not homogeneous over the entire strain range. These variations in orientation intensities were related to the feeder components found in the initial texture and the availability of these components to rotate toward the more stable orientations under the particular mode of deformation. The nonuniform texture development of the sheet along different directions appears to contribute to the anisotropic mechanical response of the sheet during stretching as measured in the evolving multiaxial flow surfaces.