Influence of the Initial Grain Size on the Rolling and Recrystallization Textures in the Alloy Al‐1.8% Cu

Abstract

The influence of the initial grain size prior to deformation on the rolling and recrystallization textures is investigated in the alloy Al-l.8wt%Cu by X-ray macrotexture analysis. Two different particle stages are examined: (i) Small shearable precipitates give rise to shear band formation and, during annealing, to nucleation of recrystallization at shear bands. (ii) Large particles cause particle stimulated nucleation of recrystallization (PSN). The microstructural evolution, particularly during recrystallization nucleation, is elucidated by metallographical investigations supported by EBSD local texture analysis.Both the initial grain size and the precipitation state strongly influence the evolution of the rolling textures. The results are interpreted with the help of Taylor-type deformation models. The recrystallization textures of Al-alloys emerge from a superposition of the orientations stemming from the various nucleation sites, i.e. Cube-bands, shear bands and particles. An increase of the initial grain size prior to deformation substantially shifts the recrystallization texture from the Cube-orientation towards the orientations being attributed to the other nucleation sites (shear bands, particles) which is interpreted by the spatial density of the various nucleation sites.

Texture comparison between room temperature rolled and cryogenically rolled pure copper

“…Since SBs largely affect the stored energy distribution, they may have a strong impact on the recrystallization behavior, and in many cases SBs act as preferred nucleation sites [14][15][16][17][18]. Ample evidence exists that preferred nucleation of certain orientations occurs at SBs [14,16,19]. In the present case, this was verified by analyzing the EBSD scans collected on the cryogenically rolled sample.…”

“…7b and 8). The orientations that are associated with nucleation at SBs in Al-alloys, namely Q, Goss, R (retained rolling) and ND rotated cube [14,16,[19][20][21] are also observed in the SBs of the 75% cryogenically deformed pure copper. The Goss and the Q components are thought to result from positive and negative TD rotations associated with the formation of SBs in copper {1 1 2}h1 1 1i and S {1 2 3}h6 3 4i oriented grains [22,23].…”

“…Only limited and sometimes contradictory information on the influence of nucleation at the brass-and Cu-type shear bands on the texture is available in the literature. There is some evidence that there may be preferred nucleation of some orientations at the Cu-type shear bands in Al-Mg alloys [14,16], Al-Cu alloys [19,20] alloys and commercially pure Al [21]. It is stated [16,[21][22][23] that peaks around the Goss {0 1 1}h1 0 0i, Q {0 1 3}h2 3 1i and perhaps the P {0 1 1}h1 2 2i and R {1 2 4}h2 1 1i orientations are associated with nucleation at Cu-type shear bands, since they appear in the recrystallization texture of these materials.…”

Effect of grain shape on the texture evolution during cold rolling of Al–Mg alloys

“…The strong impact of the initial texture on rolling texture may overshadow the influence of other material parameters. It has been shown that a decrease in initial grain size leads to an accelerated rate of rolling texture evolution [10,11]. Deformation temperature also affects the texture evolution during rolling of aluminum alloys [12,13].…”

Simulation of the Texture Evolution During Annealing of Cold Rolled Bcc and Fcc Metals Using a Cellular Automation Approach

“…During the investigation of recrystallization in a two-phase Al-l.8%Cu alloy Engler (1995) found an influence of the initial grain size, i.e. the grain size before cold rolling, on the f'mal recrystallization texture.…”