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Deformation behaviour of aluminium alloy AA-7075 T651 was investigated at high strain rate using Torsional Split Hopkinson Bar (TSHB). Hexagonal grip cylindrical AA 7075 T651specimens were deformed at different angles of twist, giving rise to strain rate ranging from730s-1to 2041 s-1. Comprehensive microstructural and textural investigation was carried out using electron back scatter diffraction (EBSD), X-ray line profile analysis and bulk texture measurement using X-rays for all the deformed samples. The high strain rate torsion tested samples showed a characteristic torsion texture for face centre cubic materials with a domin rate and strain. The T6 condition of alloy makes the matrix devoid of solute elements and thus reduces the stacking fault energy of the aluminium sol g component.Microstructural parameters determined from X-ray diffraction using modified Williamson-Hall and Variance method further corroborated these results indicating the onset of dynamic recovery at the highest strain rate.

Effects on Texture and Microstructure of Aluminium Alloy 7075-T651 during High Strain Rate Torsion