Formation of recrystallization cube texture in high purity face-centered cubic metal sheets
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Formation of Recrystallization Cube Texture in High Purity Face-Centered Cubic Metal Sheets W. Mao (Submitted 19 May 1999; in revised form 19 May 1999) An investigation on recrystallization textures in high purity face-centered cubic (fcc) aluminum, copper, and nickel indicated that the cube texture is a unique dominant final texture. In a macroview of rolling deformation, a balanced activation of four slip systems can result in certain stability of some substructure with cube orientation in the deformed matrix. In the stable substructure the dislocation density is very low, and the dislocation configuration is rather simple in comparison to other orientations so that the cube substructure can easily be transformed into cube recrystallization nuclei by a recovery process. A high orientation gradient and correspondingly high angle boundaries to the deformed matrix are usually expected around the cube nuclei, which, therefore, grow rapidly. After the primary recrystallization, the size of cube grains is much larger than the grains with other orientations, which will be expensed as the cube grains grow further, so that the cube texture can finally become a dominant texture component.
Keywords
cube texture, face-centered cubic metals, rolling deformation
1. Introduction The cube texture was first observed in sheet metal more than 70 years ago (Ref 1), and it subsequently was found in different face-centered cubic (fcc) metal sheets after a recrystallization annealing. The corresponding research on the formation mechanisms of cube texture has been conducted intensively since then. Many engineering applications require the cube texture for special uses, for example, high voltage aluminum capacitor foil (Ref 2), nickel superconducting tapes (Ref 3), and new silicon steel sheets (body-centered cubic metal) (Ref 4). Therefore, it has become more important to reveal the formation mechanisms of cube texture completely. Recrystallization is a process of nucleation and grain growth involving the migration of high angle boundaries (Ref 5). All factors that effect the nucleation and migration of high angle boundary will influence the formation of cube texture. Ibe et al. (Ref 6) found in their early work that the boundaries between recrystallization grains and deformed matrix will move very fast if they have a special orientation relationship (Ref 6). A theory of growth selection was proposed (Ref 6), which explains the mechanism of cube texture formation (Ref 7, 8) because the cube texture and main rolling texture component have just the special orientation relationship. Dillamore and Katoh (Ref 9) investigated the formation process of certain substructures in transition bands during cold rolling of cubic metals and its important influence on recrystallization nucleation (Ref 9); afterward they proposed a theory of oriented nucleation. Some experimental observations supported the theory that could also explain the formation of cube texture (Ref 10). The theories, giving different explanations of the cub
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