Superplastic nanocrystalline ceramics at room temperature and high strain rates

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

19 Scopus Citations
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Author(s)

  • J. Y. Zhang
  • Z. D. Sha
  • P. S. Branicio
  • Y. W. Zhang
  • V. Sorkin
  • Q. X. Pei

Detail(s)

Original languageEnglish
Pages (from-to)525-528
Journal / PublicationScripta Materialia
Volume69
Issue number7
Online published28 Jun 2013
Publication statusPublished - Oct 2013
Externally publishedYes

Abstract

Tensile-loading molecular dynamics simulations show that nanocrystalline SiC not only becomes ductile, but can be superplastically deformed at room temperature when grain sizes are reduced to d ∼ 2 nm. The calculated strain rate sensitivity, 0.67, implies a superplastic ceramic able to attain strains of up to 1000% at room temperature and typical strain rates (∼10-2 s-1). The origin of the superplasticity is linked to an unusually steep rise in creep rate to 106 s-1 for d = 2 nm. The results explain recent observations in SiC nanowires and suggest novel opportunities for structural ceramics.

Research Area(s)

  • Grain size effect, High strain rates, Nanostructured ceramics, Silicon carbide, Superplasticity

Citation Format(s)

Superplastic nanocrystalline ceramics at room temperature and high strain rates. / Zhang, J. Y.; Sha, Z. D.; Branicio, P. S.; Zhang, Y. W.; Sorkin, V.; Pei, Q. X.; Srolovitz, D. J.

In: Scripta Materialia, Vol. 69, No. 7, 10.2013, p. 525-528.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review