Skip to main content
×
Home

A Molecular Dynamics Simulation of High Strain-rate Deformation in Nanocrystalline Silicon Carbide

  • Yifei Mo (a1) and Izabela Szlufarska (a1)
Abstract
Abstract

Multi-million atom molecular dynamics simulations of tensile testing have been performed on nc-SiC. Reduction of grain size promotes simultaneous enhancement of ductility, toughness, and strength. Simulations show that the nc-SiC fails by intergranular fracture preceded by atomic level necking. Atomic diffusion can prevent premature cavitation and failure, and therefore it sets an upper limit on high strain-rate deformations of ceramics. We report a non-diffusional mechanism for suppressing premature cavitation, which is based on unconstrained plastic flow at grain boundaries. In addition, based on the composite's rule of mixture, we estimate Young's modulus of random high-angle grain boundaries in nc-SiC to be about 130 GPa. The effect of temperature and strain rate on mechanical properties is studied.

Copyright
References
Hide All
1.Padture N. P., Journal of the American Ceramic Society 77, 519 (1994).
2.Kim B., Hiraga K., Morita K., and Sakka Y., Nature 431, 288 (2002).
3.Ippolito M., Mattoni A., Colombo L., and Cleri F., Applied Physics Letters 87 (2005).
4.Ritchie R. O., Int. J. Fracture 100, 55 (1999).
5.Chen D., Sixta M. E., Zhang X. F., Johnghe L. C. D., and Ritchie R. O., Acta Mater. 48, 4599 (2000).
6.Luecke W. E., Wiederhorn S. M., Hockey B. J., Krause R. F., and Long G. G., Journal of the American Ceramic Society 78, 2085 (1995).
7.Evans A. G., Rice J. R., and Hirth J. P., J. Amer. Ceram. Soc. 63, 368 (1980).
8.Ovid'ko I. A., Rev. Adv. Mater. Sci. 10, 89 (2005).
9.Dyson B. F., Metal Science 10, 349 (1976).
10.Wolf D., Yamakov V., Phillpot S. R., Mukherjee A., and Gleiter H., Acta Mater. 53, 1 (2005).
11.Wan J., Duan R., Gash M. J., and Mukherjee A., J. Am. Ceram. Soc. 89, 274 (2006).
12.Szlufarska I., Nakano A., and Vashishta P., Science 309, 911 (2005).
13.Szlufarska I., Kalia R. K., Nakano A., and Vashishta P., Appl. Phys. Lett. 86, 021915 (2005).
14.Keblinski P., Phillpot S. R., Wolf D., and Gleiter H., Phys. Rev. Lett. 77, 2965 (1996).
15.Szlufarska I., Kalia R. K., Nakano A., and Vashishta P., Phys. Rev. B 71, 174113 (2005).
16.Tang M. and Yip S., Journal of Applied Physics 76, 2719 (1994).
17.Liao F., Girshick S. L., Mook W. M., Gerberich W. W., and Zachariah M. R., Appl. Phys. Lett. 86, 171913 (2005).
18.Dieter G. E. “Mechanical Metallurgy”, McGraw-Hill series in materials science and engineering (1969).
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

MRS Online Proceedings Library (OPL)
  • ISSN: -
  • EISSN: 1946-4274
  • URL: /core/journals/mrs-online-proceedings-library-archive
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 3 *
Loading metrics...

Abstract views

Total abstract views: 77 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 22nd November 2017. This data will be updated every 24 hours.