A synergetic grain growth mechanism uniting nanograin rotation and grain boundary migration in nanocrystalline materials

Jianjun Li, Feng Qin, Wenjun Lu, George J. Weng

Research output: Contribution to journalArticle

Abstract

A theoretical model has been developed to analyze the energetic characteristic of a cooperative grain growth process in nanocrystalline materials. We proposed that the process can be realized by rotating the adjoining grains first and then migrating the boundary that separates the grains, or vise versa, or by enabling both rotation and migration simultaneously. It is revealed that the synergetic process is energetically more favorable than the pure individual growth processes, i.e., nano-grain rotation or shear-coupled migration of grain boundaries. The critical stress that is required to initiate the growth process is also considerably reduced. The findings suggest a new general mode of grain growth in nanocrystalline metals.

Original languageEnglish (US)
Article number102381
JournalResults in Physics
Volume14
DOIs
StatePublished - Sep 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Keywords

  • Cooperative grain growth
  • Nano-grain rotation
  • Nanocrystalline materials
  • Shear-coupled migration of grain boundaries
  • Simulation and modelling

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