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The elasto-plastic deformation behavior, yield strength and strain rate of material under shock compression can be represented by shock front, and the shock front is also related to the variation of strength after shock compression. In this paper, we study the dynamic plastic deformation processe of nanocrystalline copper under shock compression through molecular dynamics simulations. We also explore the dependences of the shock front and the mechanism of elasto-plastic deformation on grain boundary, and make a comparison with the case of the shock response of nanocrystalline aluminum. This investigation shows that the contribution of grain boundary to the shock-front width of nanocrystalline copper are smaller than that of nanocrystalline aluminum. The plastic mechanism of nanocrystalline copper is dominated by the emission and propagation of partial dislocations, and the full dislocation and deformation twin are rarely found in the samples. From the simulations are also found that the shock-front width decreases with the increase of loaded shock stress. A quantitative inverse relationship between the shock wave front width and the shock intensity is obtained. This quantitative inverse relationship is close to other simulation result of nanocrystalline copper and quite different from results of coarse-grained copper compression experiments.
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Keywords:
- shock front /
- nanocrystalline copper /
- plastic deformation /
- molecular dynamics
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[2] [3] Jones O E, Mote J D 1969 J. Appl. Phys. 40 4920
[4] Asay J R, Chhabildas L C 2003 in ed. Horie Y, Davison L, Thadhani N N High-Pressure Shock Compression of Solids VI (New York: Springer)
[5] [6] Holian B L 2004 Shock Waves 13 489
[7] [8] Holian B L, Lomdahl P S 1998 Science 280 2085
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[11] [12] [13] Kadau K, Germann T C, Lomdahl P S, Holian B L 2002 Science 296 1681
[14] Cao B, Bringa E M, Meyers M A 2007 Metall. Mater. Trans. A 38A 2681
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[17] [18] [19] Bringa E M, Caro A, Victoria M, Park N 2005 JOM 57 67
[20] Shan Z, Stach E A, Wiezorek J M K, Knapp J A, Follstaedt D M, Mao S X 2004 Science 304 654
[21] [22] [23] Van Swygenhoven H, Derlet P M 2008 in ed. Hirth J P Dislocations in Solids (Amsterdam: Elsevier B. V.)
[24] Chen K G, Zhu W J, Ma W, Deng X L, He H L, Jing F Q 2010 Acta Phys. Sin. 59 1225 (in Chinese) [陈开果, 祝文军, 马文, 邓小良, 贺红亮, 经福谦 2010 59 1225]
[25] [26] Ma W, Zhu W J, Zhang Y L, Chen K G, Jing F Q 2011 Acta Phys. Sin. 60 016107 (in Chinese) [马文, 祝文军, 张亚林, 陈开果, 经福谦 2011 60 016107]
[27] [28] [29] Ma W, Zhu W J, Jing F Q 2010 Appl. Phys. Lett. 97 121903
[30] [31] Chen D 1995 Comput. Mater. Sci. 3 327
[32] Mishin Y, Mehl M J, Papaconstantopoulos D A, Voter A F, Kress J D 2001 Phys. Rev. B 63 224106
[33] [34] Deng X L, Zhu W J, Song Z F, He H L, Jing F Q 2009 Acta Phys. Sin. 58 4767 (in Chinese) [邓小良, 祝文军, 宋振飞, 贺红亮, 经福谦 2009 58 4772]
[35] [36] Ma W, Zhu W J, Zhang Y L, Chen K G, Deng X L, Jing F Q 2010 Acta Phys. Sin. 59 4781 (in Chinese) [马文, 祝文军, 张亚林, 陈开果, 邓小良, 经福谦 2010 59 4781]
[37] [38] [39] Honeycutt J D, Andersen H C 1987 J. Phys. Chem. 91 4950
[40] Cormier J, Rickman J M, Delph T J 2001 J. Appl. Phys. 89 99
[41] [42] Deng X L, Zhu W J, He H L, Wu D X, Jing F Q 2006 Acta Phys. Sin. 55 4767 (in Chinese) [邓小良, 祝文军, 贺红亮, 伍登学, 经福谦 2006 55 4767]
[43] [44] [45] Marsh P S 1980 LASL Shock Hugoniot Data (Berkeley: University of California Press)
[46] [47] [48] Mishin Y, Parkas D, Mehl M J, Papaconstantopoulos D 1999 Mater. Res. Soc. Symp. Proc. 538 535
[49] [50] Schiotz J, Jacobsen K W 2003 Science 301 1357
[51] Bringa E M, Caro A, Wang Y M, Victoria M, McNaney J M, Remington B A, Smith R F, Torralva B R, van Swygenhoven H 2005 Science 309 1838
[52] [53] [54] Grady D E 1981 Appl. Phys. Lett. 38 825
[55] [56] Swegle J W, Grady D E 1985 J. Appl. Phys. 58 692
[57] Grady D E 2010 J. Appl. Phys. 107 013506
[58] [59] -
[1] Meyers M A 1994 Dynamic Behavior of Materials (New York: John Wiley Sons, Inc.)
[2] [3] Jones O E, Mote J D 1969 J. Appl. Phys. 40 4920
[4] Asay J R, Chhabildas L C 2003 in ed. Horie Y, Davison L, Thadhani N N High-Pressure Shock Compression of Solids VI (New York: Springer)
[5] [6] Holian B L 2004 Shock Waves 13 489
[7] [8] Holian B L, Lomdahl P S 1998 Science 280 2085
[9] [10] Germann T C, Holian B L, Lomdahl P S, Ravelo R 2000 Phys. Rev. Lett. 84 5351
[11] [12] [13] Kadau K, Germann T C, Lomdahl P S, Holian B L 2002 Science 296 1681
[14] Cao B, Bringa E M, Meyers M A 2007 Metall. Mater. Trans. A 38A 2681
[15] [16] Jarmakani H, Bringa E, Erhart P, Remington B, Wang Y, Vo N, Meyers M 2008 Acta Mater. 56 5584
[17] [18] [19] Bringa E M, Caro A, Victoria M, Park N 2005 JOM 57 67
[20] Shan Z, Stach E A, Wiezorek J M K, Knapp J A, Follstaedt D M, Mao S X 2004 Science 304 654
[21] [22] [23] Van Swygenhoven H, Derlet P M 2008 in ed. Hirth J P Dislocations in Solids (Amsterdam: Elsevier B. V.)
[24] Chen K G, Zhu W J, Ma W, Deng X L, He H L, Jing F Q 2010 Acta Phys. Sin. 59 1225 (in Chinese) [陈开果, 祝文军, 马文, 邓小良, 贺红亮, 经福谦 2010 59 1225]
[25] [26] Ma W, Zhu W J, Zhang Y L, Chen K G, Jing F Q 2011 Acta Phys. Sin. 60 016107 (in Chinese) [马文, 祝文军, 张亚林, 陈开果, 经福谦 2011 60 016107]
[27] [28] [29] Ma W, Zhu W J, Jing F Q 2010 Appl. Phys. Lett. 97 121903
[30] [31] Chen D 1995 Comput. Mater. Sci. 3 327
[32] Mishin Y, Mehl M J, Papaconstantopoulos D A, Voter A F, Kress J D 2001 Phys. Rev. B 63 224106
[33] [34] Deng X L, Zhu W J, Song Z F, He H L, Jing F Q 2009 Acta Phys. Sin. 58 4767 (in Chinese) [邓小良, 祝文军, 宋振飞, 贺红亮, 经福谦 2009 58 4772]
[35] [36] Ma W, Zhu W J, Zhang Y L, Chen K G, Deng X L, Jing F Q 2010 Acta Phys. Sin. 59 4781 (in Chinese) [马文, 祝文军, 张亚林, 陈开果, 邓小良, 经福谦 2010 59 4781]
[37] [38] [39] Honeycutt J D, Andersen H C 1987 J. Phys. Chem. 91 4950
[40] Cormier J, Rickman J M, Delph T J 2001 J. Appl. Phys. 89 99
[41] [42] Deng X L, Zhu W J, He H L, Wu D X, Jing F Q 2006 Acta Phys. Sin. 55 4767 (in Chinese) [邓小良, 祝文军, 贺红亮, 伍登学, 经福谦 2006 55 4767]
[43] [44] [45] Marsh P S 1980 LASL Shock Hugoniot Data (Berkeley: University of California Press)
[46] [47] [48] Mishin Y, Parkas D, Mehl M J, Papaconstantopoulos D 1999 Mater. Res. Soc. Symp. Proc. 538 535
[49] [50] Schiotz J, Jacobsen K W 2003 Science 301 1357
[51] Bringa E M, Caro A, Wang Y M, Victoria M, McNaney J M, Remington B A, Smith R F, Torralva B R, van Swygenhoven H 2005 Science 309 1838
[52] [53] [54] Grady D E 1981 Appl. Phys. Lett. 38 825
[55] [56] Swegle J W, Grady D E 1985 J. Appl. Phys. 58 692
[57] Grady D E 2010 J. Appl. Phys. 107 013506
[58] [59]
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