Microstructural origin of superior compressive ductility of a nanocrystalline metal

Deng Pan, S. Kuwano, T. Fujita, M. W. Chen

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

Ultra-large compressive plasticity at room temperature has recently been observed in electrodeposited nanocrystalline nickel (nc-Ni) under micro-scale compression (Pan, Kuwano, Fujita and Chen: Nano Lett. Vol. 7 (2007), p. 2108). With aid of a TEM sample preparation technique employing focused ion beam (FIB), TEM observations on deformed nc-Ni evidenced deformation-induced microstructural evolution of nc-Ni at a variety of strain levels: Whilst the deformation increases, substantial grain growth is uncovered in the nc-Ni. No apparent ex situ evidence of intragranular dislocation activities is found in the deformed sample. As thermal diffusion plays an insignificant role in the deformation in nc-Ni at room temperature (∼0.17Tm), this premium plasticity is achieved in accommodation with the grain-boundary-mediated deformation, with assistance of extensive grain growth that is mainly driven by high stresses at steady plastic flow.

Original languageEnglish
Title of host publicationDuctility of Bulk Nanostructured Materials
PublisherTrans Tech Publications Ltd
Pages73-84
Number of pages12
ISBN (Print)0878493050, 9780878493050
DOIs
Publication statusPublished - 2010

Publication series

NameMaterials Science Forum
Volume633-634
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Keywords

  • Compressive ductility
  • Deformation
  • Microstructure
  • Nanocrystalline metal

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Microstructural origin of superior compressive ductility of a nanocrystalline metal'. Together they form a unique fingerprint.

Cite this