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| EVOLUTION OF DISLOCATION MICROSTRUCTURES IN Ta–7.5%W ALLOY FOILS DURING COLD–ROLLING |
| CHEN Chang, WANG Mingpu, WANG Shan, JIA Yanlin, ZUO Bo, XIA Fuzhong |
| School of Material Science and Engineering, Central South University, Changsha 410083 |
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Cite this article:
CHEN Chang WANG Mingpu WANG Shan JIA Yanlin ZUO Bo XIA Fuzhong. EVOLUTION OF DISLOCATION MICROSTRUCTURES IN Ta–7.5%W ALLOY FOILS DURING COLD–ROLLING. Acta Metall Sin, 2011, 47(8): 984-989.
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Abstract The most common texture formed in rolled bcc metals is 45? rotated cubic {001}<110>, the detailed deformation structure and microhardness of these grains in cold-rolled Ta–7.5%W alloy foils were carefully investigated. It was found that when cold reduction was 10%, the typical cold deformation microstructures were found in the grains, including dislocation dipoles, a"scissors" type dislocation reaction and dislocation debris. As the reduction increased, high dense dislocation walls were formed firstly and microbands formed subsequently in one kind of grains while typical dislocation cells were formed in another kind of grains. Based on energy analysis, dislocation mesh structures would relax into dislocation cells because the elastic energy of the dislocation cells is always lower than that of the dislocation mesh. It is probable that the microbands are derived from the high dense dislocation walls rather than dislocation cells while the dislocation density in the grains must reach a critical value which is about 1014/m2 in Ta–7.5%W alloy. The microhardness test showed that the work hardening rates were different in these grains. Compared with grains with cell structures, the work hardening rate was higher in grains with microbands.
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Received: 12 April 2011
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| Fund: Supported by High Technology Research and Development Program of China (No.2006AA03Z517) |
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