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EFFECT OF GRAIN SIZE ON THE GRAIN BOUNDARY CHARACTER DISTRIBUTIONS OF COLD ROLLED AND ANNEALED PURE COPPER |
CAI Zhengxu1), WANG Weiguo1), FANG Xiaoying1), GUO Hong2) |
1) School of Mechanical Engineering, Shandong University of Technology, Zibo 255049
2) Center of Testing and Analysis, Shandong University of Technology, Zibo 255049 |
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Cite this article:
CAI Zhengxu WANG Weiguo FANG Xiaoying GUO Hong. EFFECT OF GRAIN SIZE ON THE GRAIN BOUNDARY CHARACTER DISTRIBUTIONS OF COLD ROLLED AND ANNEALED PURE COPPER. Acta Metall Sin, 2010, 46(7): 769-774.
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Abstract Pure copper (99.97%) samples with varied grain sizes were cold rolled and annealed at first and then their grain boundary character distributions (GBCDs) were characterized by electron back scatter diffraction (EBSD) techniques. The results showed that the sample with finer initial grain size (12 μm) appeared to be largely populated by the so-called special boundaries such as Σ3n (n=1, 2, 3) after cold rolling and annealing, the fraction of Σ3n boundaries reached 75.7% and the averaged size of clusters of grains with Σ3n (n=1, 2, 3) orientation relationships (Σ3n CG) were as large as 200 $\mu$m in this sample. However, with initial grain size increasing, the fraction of special grain boundaries as well as the size of Σ3n CG in the samples were decreasing dramatically. In situ EBSD observation, twin-filtering and five parameter method (FPM) analyses indicated that triple-junctions are the preferred sites for the nucleation of incoherent Σ3 boundaries which play a important role in enhancing the fraction of special boundaries.It accounts for primarily the desired GBCD results as obtained in the sample with finer initial grain size.
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Received: 06 February 2010
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Fund: Supported by Nature Science Foundation of China (Nos.50771060 and 50974147) |
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