| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Cross-over of the Plasticity Mechanism in Nanocrystalline Cu |
| YUE Yong-Hai1, WANG Li-Hua1, ZHANG Ze1,2, HAN Xiao-Dong1** |
1Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, Beijing 100124
2 Department of Materials Science, State Key Lab of Si Materials, Zhejiang University, Hangzhou 310027 |
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| Cite this article: |
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YUE Yong-Hai, WANG Li-Hua, ZHANG Ze et al 2012 Chin. Phys. Lett. 29 066201 |
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Abstract Via in situ uniaxial tensile tests in a high-resolution transmission electron microscope, we directly observed a cross-over of plastic deformation mechanisms in a nanocrystalline (nc) Cu thin film containing nano-twin lamellae. For a certain twin lamellae length, the twin lamellae with a larger thickness emit dislocations inclined (Schmidt-factor dislocations, i.e., S-dislocations) toward the twin boundaries. Upon decreasing the twin lamellae thickness to a critical value, such as approximately 15 nm, the plasticity switches toward emission of twinning partial dislocations (T-dislocations) parallel to the twin planes that cause migration of the twin boundaries. The critical twin thickness value also depends on the length of the twin. These results provide direct evidence for the strengthening and softening mechanisms in nano-twinning structured metals.
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Received: 06 December 2011
Published: 31 May 2012
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| PACS: |
62.20.-x
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(Mechanical properties of solids)
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62.20.F-
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(Deformation and plasticity)
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62.20.M-
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(Structural failure of materials)
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[1] Christian J W and Mahajan S 1995 Prog. Mater. Sci. 39 1
[2] Hall E O 1951 Proc. Phys. Soc. B 64 747
[3] Petch N J 1953 J. Iron Steel Inst. 174 25
[4] Lu L, Shen Y F, Chen X H, Qian L H and Lu K 2004 Science 304 422
[5] Lu L, Schwaiger R, Shan Z W, Dao M, Lu K and Suresh S 2005 Acta. Mater. 53 2169
[6] Shen Y F, Lu L, Lu Q H, Jin Z H and Lu K 2005 Scr. Mater. 52 989
[7] Lu L, Chen X, Huang X and Lu K 2009 Science 323 607
[8] Schi鴗z J, Tolla F D D and Jacobsen K W 1998 Nature 391 561
[9] Meyers M A, Mishra A and Benson D J 2006 Prog. Mater. Sci. 51 427
[10] Chokshi A H, Rosen A, Karch J and Gleiter H 1989 Scr. Metall. Mater. 23 1679
[11] Kumar K S, Suresh S, Chisholm M F, Horton J A and Wang P 2003 Acta Mater. 51 387
[12] Van. Swygenhoven H, Spaczer M, Caro A and Farkas D 1999 Phys. Rev. B 60 22
[13] Yamakov V, Wolf D, Phillpot S R and Gleiter H 2002 Acta Mater. 50 5005
[14] Li X Y, Wei Y J, Lu L, Lu K and Gao H J 2010 Nature 464 877
[15] Zhang Y F, Han X D, Zheng K, Zhang Z, Hao Y J, Guo X Y and Wang Z L 2007 Adv. Funct. Mater. 17 3435
[16] Han X D, Zhang Y F and Zhang Z 2006 Chinese Patents Nos 200610057989.5 and No 200610144031.x
[17] Wang L H, Han X D, Liu P, Yue Y H, Zhang Z and Ma E 2010 Phys. Rev. Lett. 105 135501
[18] Wang L H, Zhang Z Ma E and Han X D 2010 Appl. Phys. Lett. 98 051905
[19] Liu P, Mao S C, Wang LH, Zhang Z and Han X D 2011 Scr. Mater. 64 343
[20] Deng Q S, Cheng Y Q, Yue Y H, Zhang L, Zhang Z, Han X D and Ma E 2011 Acta Mater. 59 6511
[21] Yue Y H, Liu P, Zhang Z, Han X D and Ma E 2011 Nano. Lett. 11 3151
[22] Jin Z -H, Gumbsch P, Albe K, Ma E, Lu K, Gleiter H and Hahn H 2008 Acta. Mater. 56 1126
[23] Wang Y B, Wu B and Sui M L 2008 Appl. Phys. Lett. 93 041906
[24] Hirth J P and Lothe J 1982 Theory of Dislocations 2nd edn (New York: John Wiley and Sons) p 764
[25] Van Swygenhoven H, Derlet P M and Fr鴖eth A G 2004 Nature Mater. 3 399
[26] Wang Y B, Sui M L and Ma E 2007 Phil. Mag. Lett. 87 935
[27] Fr鴖eth A G, Derlet P M and Van Swygenhovena H 2004 Appl. Phys. Lett. 85 5863
[28] Guo X and Xia Y Z 2011 Acta. Mater. 59 2350
[29] Deng C and Sansoz F 2009 Appl. Phys. Lett. 95 091914 |
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