Recrystallisation and texture in hot deformed aluminium alloy 7010 thick plates

Abstract

The recrystallisation behaviour and its effect on the crystallographic texture during solution heat treatment of thick aluminium alloy 7010 plates has been studied both on commercially hot rolled plates and on laboratory specimens deformed in plane strain compression. In addition to X-ray macrotexture analysis, individual grain orientation measurements within the recovered subgrains and the recrystallised new grains were performed by means of electron backscattering diffraction. Significant recrystallisation takes place during the solution treatment with almost no change in the macrotexture. This behaviour is explained by the balancing effect of randomisation of the texture during recrystallisation and texture sharpening within the recovered matrix regions.MST/3433

Texture and anisotropy in cold rolled and recovery annealed AA 5182 sheets

“…This effect of texture sharpening upon recovery in Al alloys has already been described earlier 27 and is attributed to a clean-up of the subgrain structure accompanied by a reduction in average misorientation between adjacent subgrains. 28 The evolution of the substructure during back annealing was studied in more detail by TEM. Figure 7 contains TEM bright field images of the substructure in the as deformed and two back annealed samples.…”

Progress in dispersoids distribution precipitating during homogenising Zr-containing Al–Cu–Li and Al–Zn–Mg alloys

“…The dispersoid precipitation in 7xxx Al-Zn-Mg-Cu alloys has been extensively investigated both experimentally and theoretically in the past years [14,28,29,[57][58][59]. It can be concluded that the improved dispersoid distribution can be achieved through refining the homogenisation conditions and modify the contents of the Zr, Mn, Sc etc., dispersoid-forming elements.…”

Development of a Two-Phase Model for the Hot Deformation of Highly-Alloyed Aluminum

“…Combined experiment and finite element simulation have shown the position of maximum shear texture development to lie 80% of the distance from the centerline to the surface [15]. Such gradients in texture have been observed in 7010 plate, with the centerline bearing components typical of plane strain compression and, closer to the surface, a transition to a texture with {001} 110 as the dominant component [16].…”

“…In a detailed study of 7010 plate, Engler et al [16] provide evidence that the recrystallized texture contains a random component associated with particle stimulated nucleation (PSN), while recovery of subgrain structure tends to sharpen the original deformation texture. As indicated above, Zr addition to the alloy suppresses development of recrystallization components.…”

“…The voids appear aligned in distinct patterns and show both increased frequency and severity with increasing temperature AA7050 [16] AA7050 [15] (482 o C) AA7050 [25] AA7075 [17] Figure 11: Saturation stress, normalized by shear modulus, versus temperature compensated strain rate for compression tests in this work (solid symbols), torsion tests by Giardina [24], tension tests by Ghosh [23], compression tests by Hander [28], and results for 7075 from a correlation by Sheppard et al [25].…”