Strength and Fracture of Single Crystal Metal Nanowire


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Numerical simulations have been carried out to determine the mechanical property of single crystal copper nanowire subjected to tension using the molecular dynamics method. The mechanism of deformation, strength and fracture are elucidated based on these numerical simulations. No strengthening is found after yielding of the single crystal nanowire. The simulation results show that the strength of copper nanowire is far greater than that of realistic polycrystalline bulk copper. By decreasing the size of the nanowire's cross-section, which leads to an increase of the ratio of surface atoms, the yield stress is increased. The strain rate has an influence on strength, and mechanism of deformation and fracture. When the strain rate is comparatively low, plastic deformation arises from dislocation slips and twins. However, when the strain rate is sufficiently high, amorphization is a dominant factor of plastic deformation and super-plasticity is found. The fracture process is demonstrated using the atomic images.



Key Engineering Materials (Volumes 261-263)

Edited by:

Kikuo Kishimoto, Masanori Kikuchi, Tetsuo Shoji and Masumi Saka




H. A. Wu et al., "Strength and Fracture of Single Crystal Metal Nanowire", Key Engineering Materials, Vols. 261-263, pp. 33-38, 2004

Online since:

April 2004




[1] Y. Kondo and K. Takayanagi, Physical Review Letters, 79 (1997) p.3455.

[2] N.I. Kovtyukhova and T.E. Mallouk, Chemistry-A European Journal, 8 (2002) p.4355.

[3] G Bilalbegovic, Physical Review B, 58 (1998) p.15412.

[4] S. Tanimori, K. Ishida, O. Sueoka and S. Shimamura, Journal of the Physical Society of Japan, 68 (1999) p.3556.

[5] S.Y. Hu, M. Ludwig, P. Kizler and S. Schmauder, Modelling and Simulation in Materials Science and Engineering, 6 (1998), p.567.

[6] H. Mehrez and S. Ciraci, Physical Review B, 56 (1997) p.12632.

[7] T. Kitamura, K. Yashiro and R. Ohtani, JSME International Journal Series A, 40 (1997) p.430.

[8] J.W. Kang and H.J. Hwang, Nanotechnology, 12 (2001) p.295.

[9] E.Z. da Silva, A.J.R. da Silva and A. Fazzio, Physical Review Lettters, 87 (2001) p.256102.

[10] P.S. Branicio and J.P. Rino, Physical Review B, 62 (2000) p.16950.

[11] H.A. Wu and A.K. Soh, International Journal of Nonlinear Sciences and Numerical Simulation, 4(2003) p.233.

[12] R.E. Miller and V.B. Shenoy, Nanotechnology, 11 (2000) p.139.

[13] H.A. Wu, X.X. Wang, H.Y. Liang and G.Y. Liu, Acta Metallurgica Sinica, 38 (2002) p.903.

[14] H.A. Wu, X.X. Wang, X.G. Ni and Y. Wang, Acta Metallurgica Sinica, 38 (2002) p.1219.

[15] M. Doyama and Y. Kogure, Computational Materials Science, 14 (1999) p.80 (a) (b) (c) (d) Fig. 5 Atomic images of fracture process of metal nanowire (a) !=0. 75 (b) !=0. 81 (c) !=0. 84 (d) !=0. 87.