Orientation relationships in a partially recrystallised polycrystalline AlSi-alloy

• Published in: Acta materialia 1996-08, Vol.44 (8), p.3407-3419
• Main Authors: Skjervold, S.R., Ryum, N.
• Format: Article
• Language: English
• Subjects: Applied sciences; Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization; Cold working, work hardening; annealing, quenching, tempering, recovery, and recrystallization; textures; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Metals. Metallurgy; Physics; Treatment of materials and its effects on microstructure and properties
• ISSN: 1359-6454; 1873-2453
• DOI: 10.1016/1359-6454(95)00413-0

A moderately deformed polycrystalline AlSi alloy of initially random texture whose deformation structure is discussed in an accompanying paper was annealed until partial recrystallisation. The nucleation of recrystallised grains occurred preferentially in regions of large misorientation gradients. Particularly potent regions were shown to be the grain boundary and triple line regions, and the regions close to individual second phase particles or clusters of such particles. It was found that a majority of the recrystallised grains were developed in regions where a cumulative rotation of the lattice about a 〈111〉-axis occurred. The angle of rotation about a 〈111〉-axis of grains relative to the surrounding matrix was in the range 35–45° for about 50% of these cases. The preferred selection of recrystallised grains having the ∼40° 〈111〉 orientation relationship is suggested to be due to the easy formation of such sites in the deformed matrix and also to their preferential growth potential—compromise between the frequency of available nuclei and their respective growth velocities.