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| NANOCRYSTALLIZATION OF Al–12.7Si ALLOY INDUCED BY SURFACE INTENSE PLASTIC DEFORMATION |
| LIU Gang 1, YAN Wencong 1, YU Fuxiao 2, ZHAO Gang 3, ZHAO Xiang 2, ZUO Liang 1 |
1. Research Academy, Northeastern University, Shenyang 110004
2. Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819
3. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819 |
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Cite this article:
LIU Gang YAN Wencong YU Fuxiao ZHAO Gang ZHAO Xiang ZUO Liang. NANOCRYSTALLIZATION OF Al–12.7Si ALLOY INDUCED BY SURFACE INTENSE PLASTIC DEFORMATION. Acta Metall Sin, 2011, 47(6): 649-654.
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Abstract Gradient nano–micro–structured surface layer was synthesized on Al–12.7Si alloy by means of surface mechanical attrition treatment. The microstructural evolution was examined by XRD and TEM. The surface intense deformation induced nanocrystallization mechanism was summarized as follows: upon the application of repeated loads, dislocation cells/sub–micro–grains form through slips, annihilations and recombinations of high density of dislocations in Al coarse grains. The misorientations between the dislocation cells/sub–micro–grains increased by cotinuously absorbing more dislocatons. High density of dislocations in sub–micro–grains developing in above route led to the redction of grain size and the increment of misorientatins between the refined grains, and finally equiaxed nc grains with random orientations formed. The refinement of Si particles was found to be carried out through single–or multi–slips of internal dislocations and partial dissolution, then the refined Si particles distributed niformly due to the plastic flows in Al matrix.
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Received: 13 January 2011
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| Fund: Supported by High Technology Research and Development Program of China (No.2008AA030701) and National Science and Technology Supporting Item (No.2009BAE80B01) |
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