Effect of the Heat Treatment on the Cube Recrystallization Texture of Al-Mn-Mg Aluminum Alloy
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INTRODUCTION
RECRYSTALLIZATION texture has long been a subject of research by metallurgists since it is one of the main factors responsible for the anisotropy in the mechanical behavior of final sheet products. The recrystallization texture of most aluminum alloys is represented by the cube orientation with some scattering about the rolling direction (RD) toward the Goss orientation. The cube recrystallization texture has been studied extensively. It is generally accepted that cubeoriented grains evolve from band-like structures, i.e., the so-called cube-bands, which are present in the deformed microstructure.[1–4] The cube orientation has a fast growing 40h111i orientation relationship with respect to the S-orientation.[5] Many factors including alloy composition, initial microstructure, and texture before cold rolling, rolling reduction, and annealing temperature significantly control the formation of the cube texture. In particle-containing aluminum alloys, the recrystallization behavior is strongly affected by the precipitation state. Large particles with particle size larger than 1 lm generally promote recrystallization by particle-stimulated nucleation (PSN), whereas finely dispersed precipitates, either pre-present in the as-deformed state or precipitating during the recrystallization annealing, strongly retard recrystallization.[6–10] The effect of precipitation on the recrystallization texture is very complicated, depending on the interaction between WENCHANG LIU, Professor, and MIN MA, Ph. D. Student, are with Key Laboratory of Metastable Materials Science and Technology, College of Materials Science and Engineering, Yanshan University, Qinhuangdao, 066004, P.R. China. FUQIAN YANG, Professor, is with the Department of Chemical and Materials Engineering, University of Kentucky, 177 Anderson Hall, Lexington, KY, 40506. Contact e-mail: [email protected] Manuscript submitted March 19, 2012. Article published online January 24, 2013 METALLURGICAL AND MATERIALS TRANSACTIONS A
precipitation and recrystallization as well as the size, density, and thermal stability of precipitates.[11–29] PSN can cause a nearly random recrystallization[11–14] and is possibly responsible for the weak peaks around the P- and ND-rotated cube components.[15–18] In less pinned cases, fine dispersoids may selectively inhibit PSN, which in turn can induce a pronounced cube recrystallization texture.[18–21] Concurrent precipitation strongly affects the recrystallization texture of aluminum alloys. It has been found that concurrent precipitation results in relatively strong P- and ND-rotated cube textures in commercial Al-Mn-Mg[22] and Al-Mn[23] alloys as well as a very strong P texture in continuous cast (CC) AA 3000 series aluminum alloys.[24–27] This study is focused on investigating the effects of precipitation before cold rolling on the recrystallization kinetics, the final grain size, and the recrystallization texture of AA 3105 aluminum alloy.
II.
EXPERIMENTAL
The material used in the current study was CC AA 3105 aluminum alloy. The che
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