Strain and texture evolution of ED-rotated cubes during quasi-static and dynamic tensile testing of Al–Mg–Si-profiles in the as-extruded T1-temper condition

Elastic strain and texture evolution during tensile testing of peak-hardened Al–Mg–Si-profiles

“…The as homogenised Ø 95 mm billets were then extruded to 3 mm × 60 mm rectangular profiles (extrusion ratio, R ∼ 40) at the vertical laboratory press at SINTEF, for further details see Ref. [2]. After extrusion, water quenching and storage at room temperature for several months, the alloy was subjected to a T6 heat treatment, which corresponds to a conversion of heat-treatable material to the peak-hardened condition by artificial age hardening.…”

“…The elastic lattice deformations, ε hh measured for a reflection with reciprocal lattice vector h can be expressed as [2] …”

“…where a hi and a hj are direction cosines referring to the orientation of the measured strain relative to the macroscopic xyz Cartesian reference [2], ε ij the strain tensor elements in the xyz system and d h (ε a ) is the h lattice spacing as a function of ε a . Note that d h (0) may differ from grain to grain due to local residual strains.…”

“…In the chosen diffraction geometry, strains along the direction of the incident beam, x, are poorly resolved and has therefore been neglected [2]. Furthermore, crystalline isotropy has been assumed in order to simplify the analysis [2].…”

“…In fully recrystallised profiles, the resulting microstructure usually consists of randomly oriented grains in the surface region, whereas a coarser and quite strongly textured microstructure is found in the bulk region (br) [1]. The deformation response of 3.0 mm thick Al-Mg-Si-profiles, displaying such microstructures, have previously been investigated in situ by high-energy synchrotron X-ray diffraction in terms of micro-and mesoscopic geometrical distributions and localized evolutions of elastic strains and grain rotations [2]. Analysis at intermediate length scales revealed strongly inhomogeneous through-profile strains, caused by the presence of the three distinct microstructure regions (sr-br-sr) and the compatibility relations that apply at their interfaces.…”