Nucleation of partial dislocations at a crack and its implication on deformation mechanisms of nanostructured metals

Journal of the Mechanics and Physics of Solids

Volumn 57, Issue 7, 2009, Pages 1078-1092

  Liu, Gang ^a   Xu, Guanshui ^a  

^a University of California Riverside   (United States)

Author keywords

Activation energy; Crack; Dislocation nucleation; Nanostructured metal; Partial dislocation

Indexed keywords

ATOMIC CALCULATIONS; ATOMIC LAYER; ATOMIC POTENTIAL; BOUNDARY INTEGRAL METHODS; CRACK CONFIGURATION; CRITICAL STRESS; DEFORMATION MECHANISM; DISLOCATION NUCLEATION; DISPLACEMENT DISCONTINUITY; ELASTIC MEDIUM; FCC METALS; GENERALIZED STACKING FAULT ENERGIES; HIGH STRAIN RATES; INTRINSIC STACKING FAULT; MULTISCALE MODELS; NANOSTRUCTURED METAL; NANOSTRUCTURED METALS; PARTIAL DISLOCATION; PARTIAL DISLOCATIONS; RELATIVE DISPLACEMENT; SADDLE POINT; SLIP PLANE; STACKING FAULT ENERGIES;

ACTIVATION ENERGY; ATOMS; CRACKS; DEFORMATION; ELECTRON ENERGY LOSS SPECTROSCOPY; METALS; MOSFET DEVICES; NANOSTRUCTURED MATERIALS; NUCLEATION; STRAIN RATE;

STACKING FAULTS;

EID: 67349228732     PISSN: 00225096     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.jmps.2009.03.005     Document Type: Article

References (31)

1. Argon A.S. Brittle to ductile transition in cleavage fracture. Acta Metallugica 35 1 (1987) 185-196
2. Asaro R.J., and Suresh S. Mechanistic models for the activation volume and rate sensitivity in metals with nanocrystalline grains and nano-scale twins. Acta Materialia 53 12 (2005) 3369-3382
3. Barnett D.M., and Asaro R.J. Fracture mechanics of slit-like cracks in anisotropic elastic media. Journal of the Mechanics and Physics of Solids 20 6 (1972) 356-366
4. Buehler M., Hartmaier A., and Gao H. Atomistic and continuum studies of crack-like diffusion wedges and associated dislocation mechanisms in thin films on substrates. Journal of the Mechanics and Physics of Solids 51 (2003) 2105-2125
5. Gao H., Zhang L., Nix W., Thompson C., and Arzt E. Crack-like grain boundary diffusion wedges in thin metal films. Acta Materialia 47 (1999) 2865-2878
6. Greer J.R., Oliver W.C., and Nix W.D. Size dependence in mechanical properties of gold at the micron scale in the absence of strain gradients. Acta Materialia 53 (2005) 1821-1830
7. Hartmaier A., and Gumbsch P. Thermal activation of crack-tip plasticity: the brittle or ductile response of a stationary crack loaded to failure. Physical Review B 71 2 (2005) 024108
8. Hartmaier A., and Gumbsch P. Scaling relations for crack-tip plasticity. Philosophical Magazine A-Physics of Condensed Matter Structure Defects and Mechanical Properties 82 17-18 (2002) 3187-3200
9. Hirth J.P., and Lothe J. Theory of Dislocations. 2nd ed (1982), John Wiley, New York
10. Kumar K.S., Van Swygenhoven H., and Suresh S. Mechanical behavior of nanocrystalline metals and alloys. Acta Materialia 51 19 (2003) 5743-5774
11. Kysar J.W. Energy dissipation mechanisms in ductile fracture. Journal of the Mechanics and Physics of Solids 51 (2003) 795-824
12. Lothe J. Dislocations in anisotropic media. The interaction energy. Philosophical Magazine A 46 1 (1982) 177-180
13. Li C., and Xu G. Critical conditions for dislocation nucleation at surface steps. Philosophical Magazine 86 20 (2006) 2957-2970
14. Mishin Y., Farkas D., Mehl M.J., and Papaconstantopoulos D.A. Interatomic potentials for monoatomic metals from experimental data and ab initio calculations. Physical Review B 59 5 (1999) 3393-3407
15. Mishin Y., Mehl MJ., Papaconstantopoulos D.A., Voter A.F., and Kress J.D. Structural stability and lattice defects in copper: ab initio, tight-binding, and embedded-atom calculations. Physical Rreview B 63 22 (2001) 224106
16. Nabarro F.R.N. Dislocations in a simple cubic lattice. Proceedings of the Physical Society of London 59 332 (1947) 256-272
17. Peierls R. The size of a dislocation. Proceedings of the Physical Society vol. 52 (1940) 34-37
18. Rice J.R. Dislocation nucleation from a crack tip-an analysis based on the Peierls concept. Journal of the Mechanics and Physics of Solids 40 2 (1992) 239-271
19. Rice J.R., and Beltz G.E. The activation-energy for dislocation nucleation at a crack. Journal of the Mechanics and Physics of Solids 42 2 (1994) 333-360
20. Rice J.R., and Thomson R. Ductile versus brittle behavior of crystals. Philosophical magazine 29 1 (1974) 73-97
21. Schoeck G., and Puschl W. The formation of dislocation loops at crack tips in 3 dimensions. Philosophical Magazine A-Physics of Condensed Matter Structure Defects and Mechanical Properties 64 4 (1991) 931-949
22. Vitek V. Intrinsic stacking faults in body-centred cubic crystals. Philosophical Magazine 18 154 (1968) 773-786
23. Xu G., and Argon A.S. Homogeneous nucleation of dislocation loops under stress in perfect crystals. Philosophical Magazine Letters 80 9 (2000) 605-611
24. Xu G., Argon A.S., and Oritz M. Critical configurations for dislocation nucleation from crack tips. Philosophical Magazine A-Physics of Condensed Matter Structure Defects and Mechanical Properties 75 2 (1997) 341-367
25. Xu G., Argon A.S., and Ortiz M. Nucleation of dislocations from crack tips under mixed-modes of loading-implications for brittle against ductile behavior of crystals. Philosophical Magazine A-Physics of Condensed Matter Structure Defects and Mechanical Properties 72 2 (1995) 415-451
26. Xu G., and Ortiz M. A variation boundary integral method for the analysis of 3-d cracks of arbitrary geometry modeled as continuous distributions of dislocation loops. International Journal for Numerical Methods in Engineering 36 21 (1993) 3675-3701
27. Xu G., and Zhang C. Analysis of dislocation nucleation from a crystal surface based on the Peierls-Nabarro dislocation model. Journal of the Mechanics and Physics of Solids 51 8 (2003) 1371-1394
28. Uchic M.D., Dimiduk D.M., Florando J.N., and Nix W.D. Sample dimensions influence strength and crystal plasticity. Science 305 (2004) 986-989
29. Wagner G. The film surface as the site for spontaneous nucleation of dislocation half-loops in strained heteroepitaxial systems. Physica Status Solidi A 173 2 (1999) 385-403
30. Yamakov V., Wolf D., Phillpot S.R., Mukherjee A.K., and Gleiter H. Deformation mechanism crossover and mechanical behaviour in nanocrystalline materials. Philosophical Magazine Letters 83 6 (2003) 385-393
31. Zhu T., Li J., and Yip S. Atomistic study of dislocation loop emission from a crack tip. Physical Review Letters 93 2 (2004) 025503