On the influence of orientation pinning on growth selection of recrystallization
- Los Alamos National Lab., NM (United States). Center for Materials Science
With the help of techniques for local orientation determination it has been proved that the recrystallization textures of Al-alloys evolve by a preferred formation of some orientations at characteristic nucleation sites and a subsequent growth selection of distinct orientations out of this spectrum of nucleus orientations. As an alternative to the standard explanation of a favored growth of grains with a special orientation relationship to the deformed matrix (e.g. 40{degree} <111>), recently the concept of orientation pinning has been proposed, which considers that the growth selection is determined by special orientation relationships being disfavored (low-angle and twin grain boundaries). The present paper reviews the two rivaling theories of oriented nucleation and oriented growth to explain recrystallization textures and addresses the new approach of orientation pinning. New EBSD-results on commercial purity Al which substantiate a growth selection of the exact cube-orientation out of the nucleus spectrum available in the cube-bands and the R-orientation out of the nucleus spectrum of the grain boundaries are presented. A semi-quantitative model to simulate the effect of orientation pinning on the evolution of recrystallization textures is introduced. The results are discussed in view of growth selection and the 40{degree} <111> orientation relationship.
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Alexander von Humboldt-Stiftung, Bonn (Germany)
- OSTI ID:
- 616386
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 5 Vol. 46; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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