A& melall. Vol. 35, No. 2, pp. 427438, 1987 oooi-6160/87$3.00 f0.00 Printed in Great Britain. All rights reserved Copyright 0 1987 Pergamon Journals Ltd ROLLING AND RECRYSTALLIZATION TEXTURES IN DIRECTIONALLY SOLIDIFIED ALUMINIUM J. HIRSCH’, E. IVES’ and K. L&IKE’ ‘Institut fur Allg. Metallkunde und Metallphysik, RWTH Aachen, F.R.G. and *Department of Physical Metallurgy, 7034 Trondheim-NTH, Norway (Receirred 10 April 1986) A&&a&-From dir~tionaliy solidified aluminium with a (IOO} fibre texture specimens of different orientations were cut and the textures after rolling (95% reduction) and recrystallization were determined. The results are discussed on the basis of the current concepts on deformation and recrystallization in single and polycrystalline materials. Due to the strong influence of the different starting textures, characteristic differences in the rolling textures are obtained. For the first time, a case is reported for which an experimental rolling texture is completely explicable in terms of the Taylor theory under full constraints condition. Further, the recrystallization textures, although appearing more uniform, exhibit clear differences which yield new evidence with respect to the mechanisms of formation of the cube texture. It shows that in the present case for obtaining a pronounced cube texture, both the conditions of oriented growth (in the sense of 40” (111) rotations) and oriented nucleation (in the sense of properly oriented transition bands) must occur. R&urn&--Nous avons d&coup6 des Bchantillons de diffitrentes orientations dans de I’aluminium obtenu par solidification directionnelle et prbsentant une texture fibreuse (IOO), et nous avons dbtermini les textures apr&s laminage (rkduction de 9.5%) et recristallisation. Nous discutons les r6sultats sur la base des concepts actuels de la d~fo~ation et de la r~ristallisation dans les mat~riaux mono- et ~lycristallins. A cause de la forte influence des diffhrentes textures de dCpart, on obtient des diffkrences caractbristiques dans les textures de laminage. Pour la premitre fois, nous signalons un cas pour lequel une texture de laminage exgrimentale est complttement d&rite B l’aide de la thkorie de Taylor. De plus, les textures de r~ristallisation, bien qu’apparaissant plus uniformes, prksentent des differences nettes qui donnent de nouvelles donndes sur les mkcanismes de formation de la texture cubique. Si l’on veut obtenir dans le cas pr6sent une texture cubique prononcie, il fait satisfaire B la fois les conditions de la croissance orientte (c’est H dire des rotations de 40” autour de (111)) et de la germination orientCe (c’est B dire deux bandes de transition convenablement orient&s). Zusanunenfasaung-Aus einem gerichtet erstarrten Aluminium GuDblock mit einer (100) Fasertextur wurden unter~hi~lich orientierte Proben geschnitten und die Walztexturen (95% Walzgrad) und die Rekristallisaionstexturen ermittelt. Die Ergebnisse werden auf der Basis aktueller Konzepte iiber die Verformung und Rekristallisation ein- und vielkristalliner Metalle diskutiert. Der starke EinfluD der verschiednen Ausgangstexturen bewirkt charakteristische Unterschiede in den Walztexturen, So wird hier zum ersten Male der Fall gezeigt, bei dem eine experimentelle Walztextur mit der Vorhersage der strikten Taylor-Theorie v6llig iibereinstimmt. Die Rekristallisationstexturen ergeben ein sehr einheitliches Bild. Dennoch treten einige charakteristische Unterschiede auf, aus denen sich neu Erkenntnisse iiber die Ausbiidung der Wiirfeltextur ergeben. So zeigt der vorliegende Fall, daB fiir die Ausbildung einer ausgepriigten Wiirfeitextur beide Bedingungen, die des orientierten Wachstums (im Sinne einer 40” (11 l)-Orientierungsbeziehung) und die der orientierten Keimbildung (im Sinne entsprechend orientierter UbergangsbInder) erfiillt sein miissen. 1. I~RODU~ION textures. This latter aspect has received very little Based on the earlier experiments of Nes (11, rolling attention so far. and recrystallization textures were determined on The present work is concerned mainly with two dir~tionalIy solidified aiuminium with a (100) fibre important questions: texture. By choosing different directions of rolling (a) The extent of application of predictions, like the with respect to the fibre axis, the rolling texture as Taylor theory, in understanding particularly when well as the alignment of boundary structures could the influence of the starting conditions, e.g. the initial systematically be varied. After numerous single crys- texture and the grain boundary alignment is consid- tal experiments, this work represents a further step in ered [2,3]. the investigation of the deformation and re- (b) The old question about the mechanism of crystallization behaviour of polycrystaltine materials, formation of the cube orientation in recrystallization and, at the same time, reveals the influence of the textures. This orientation dominates the re- starting texture on the roliing and r~rystalli~tion crystalIization textures of rolled pure f.c.c. metals 427