High temperature plane strain compression of cube oriented aluminium crystals

Abstract

The influence of deformation temperature on the stability of the (001)[100] and (001)[110] orientations of Al and Al-1%Mn crystals has been determined by means of channel die tests at 200–400°C. X-ray pole figures and EBSP analyses demonstrate that the (001)[110] crystals decompose at all temperatures into deformation bands of complementary {112}〈11 1 〉 orientations. The behaviour of the cube orientation is temperature and strain rate dependent: at T < 0.6 T m (∼ 300°C) decomposition into bands of octahedral slip occurs whereas at higher temperatures the cube orientation deforms by double slip on {110}〈1 1 0〉 systems and is stable up to high strains ( ϵ ∼ 1.5). A simple analytical model and numerical simulations confirm that {110}〈1 1 0〉 slip affects the near-cube orientations and tends to stabilize the cube orientation; the latter can be considered as a hot rolling texture component.