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| STUDY ON TWO CRITICAL MECHANISMS OF PLC EFFECT OF 5456 Al–BASED ALLOY |
| FU Shihua, CHENG Teng, ZHANG Qingchuan, CAO Pengtao, HU Qi |
| CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027 |
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Cite this article:
FU Shihua CHENG Teng ZHANG Qingchuan CAO Pengtao HU Qi. STUDY ON TWO CRITICAL MECHANISMS OF PLC EFFECT OF 5456 Al–BASED ALLOY. Acta Metall Sin, 2012, 48(12): 1453-1458.
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Abstract The normal critical behavior at low temperature and inverse critical behavior at high temperature of 5456 Al–based alloy were observed via tension tests at different temperatures. By comparing the stress–strain curves at different temperatures, the lower and upper envelope curves were identified. Before the critical strain, the stress followed the lower envelope curve at low temperature while followed the upper envelope curve at high temperature. The subsequent serrations, which were upward at low temperature but downward at high temperature, waved between the two envelope curves. Furthermore, in relation with stress and dislocation motion, two types of dislocation motion for stable plasticity corresponding to the upper and lower envelope curves were presented, respectively. The lower envelope curve implied few dislocations were pinned by solute, while the upper envelope curve implied some dislocations were pinned by solute prior to escape. Finally, two critical mechanisms were proposed that the critical strain depended on the first pinning process in normal behavior and on the first unpinning process in inverse behavior.
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Received: 14 May 2012
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| Fund: Supported by National Basic Research Program of China (No.2011CB302105), National Natural Science Foundation of China (Nos.51271174, 11072233 and 11102201) and China Postdoctoral Science Foundation (No.20100480684) |
| [1] Cottrell A H. Philos Mag, 1953; 44: 829[2] Cieslar M, Fressengeas C, Karimi A, Martin J L. Scr Mater, 2003; 48: 1105[3] Nagarjuna S, Anozie F N, Evans J T. Mater Sci Technol, 2003; 19: 1661[4] Lu J Y, Jiang Z Y, Zhang Q C. Acta Metall Sin, 2006; 42:139(卢俊勇, 蒋震宇, 张青川. 金属学报, 2006; 42: 139)[5] Liu H W, Zhang Q C, Lu J Y, Xiang G F, Wu X P. Acta Metall Sin, 2006; 42: 925(刘颢文, 张青川, 卢俊勇, 项国富, 伍小平. 金属学报, 2006; 42: 925)[6] Sleeswyk A W. Acta Metall, 1958; 6: 598[7] Mulford R A, Kocks U F. Acta Metall, 1979; 27: 1125[8] McCormick P G. Acta Metall, 1988; 36: 3061[9] Springer F, Nortmann A, Schwink C. Phys Status Solidi, 1998; 170A: 63[10] Klose F B, Ziegenbein A, Weidenm¨uller J, Neuh¨auser H, Hahner P. Comput Mater Sci, 2003; 26: 80[11] Balik J, Lukac P, Kubin L P. Scr Mater, 2000; 42: 465[12] Chihab K, Fressengeas C. Mater Sci Eng, 2003; A356: 102[13] Peng K P, Chen W Z, Qian K W. Mater Sci Eng, 2006;A419: 53[14] Cui C Y, Gu Y F, Yuan Y, Harada H. Scr Mater, 2011;64: 502[15] Kubin L P, Estrin Y. Acta Metall Mater, 1990; 38: 697[16] McCormick P G. Acta Metall, 1972; 20: 351[17] Brechet Y, Estrin Y. Acta Metall Mater, 1995; 43: 955[18] Cai M C, Niu L S, Yu T, Shi H J, Ma X F. Mater Sci Eng,2010; A527: 5175[19] Rodriguez P, Venkadesan S. Solid State Phenom, 1995;42–43: 257[20] Soare M A, Curtin W A. Acta Mater, 2008; 56: 4091[21] Flor H, Neuh¨auser H. Acta Metall, 1980; 28: 939[22] Rizzi E, H¨ahner P. Int J Plasticity, 2004; 20: 121[23] Hu Q, Zhang Q C, Cao P T, Fu S H. Acta Mater, 2012; 60: 1647 |
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