Residual Stress Variation in Polycrystalline Copper during Recrystallization K. WIERZBANOWSKI a, * , A. BACZMAN ´ SKI a , R. WAWSZCZAK a , B. BACROIX b and A. LODINI c a WFiTJ, AGH University of Science and Technology, al. Mickiewicza 30, 30-059 Krako ´ w, Poland; b LPMTM-CNRS, Universite ´ Paris XIII, 99, av. J.B. Clement, 93 430 Villetaneuse, France; c LACM, Universite ´ de Reims Champagne Ardenne, 9, bd. de la Paix, 51100 Reims, France A general multi-reflection method was applied to determine the stress level in deformed and recrystallized polycrystalline copper samples. Different reflections hkl were simultaneously used in the fitting procedure. The anisotropic diffraction elastic constants were calculated using the self-consistent model and crystallographic texture. Important decrease of the first order residual stresses was observed during recovery and recrystallization. Independently, diffraction peak widths and intensities were examined for a few characteristic texture components during the recrystallization process. The importance of cubic orientation grains in the recrystallization process was confirmed. Keywords: Residual stress; Multireflection method; Recrystallization; Crystallographic texture; Peak width; Stored energy INTRODUCTION Recrystallization of previously deformed polycrystalline material is a very complex process. Microstructure, residual stresses, stored energy and crystallographic texture are very strongly modified during annealing. Diffraction technique offers a deep insight in many aspects of this process. In the present work a general multi- reflection method for determination of the stress field was used. The advantage of the new method is that various reflections hkl are simultaneously used in fitting procedure, consequently the results are statistically more representative in comparison with the single reflection method. The residual stress was measured in rolled and recrystallized copper samples. Residual stress is in general accompanied by dislocation field. This latter is often associated with the stored energy, remaining after deformation process. To have a full description of recrystallization process also the dislocation density and texture transformation have to be examined. This information was obtained by the study of peak width and intensity corresponding to main texture maxima. ISSN 1023-8166 print/ISSN 1477-2655 online q 2004 Taylor & Francis Ltd DOI: 10.1080/10238160410001734685 *Corresponding author. Fax: þ 48-126340010. E-mail: wierzbanowski@novell.ftj.agh.edu.pl Journal of Neutron Research, January–September 2004 Vol. 12 (1–3), pp. 201–205