Guidance to design grain boundary mobility experiments with molecular dynamics and phase-field modeling

Michael Tonks, Yongfeng Zhang, S. B. Biner, Paul C. Millett, Xianming Bai

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Quantitative phase-field modeling can play an important role in designing experiments to measure the grain boundary (GB) mobility. In this work, molecular dynamics (MD) simulation is employed to determine the GB mobility using Cu bicrystals. Two grain configurations are considered: a shrinking circular grain and a half-loop grain. The results obtained from the half-loop configuration approach asymptotically to that obtained from the circular configuration with increasing half-loop width. We then verify the phase-field model by direct comparison to the MD simulation results, obtaining excellent agreement. Next, this phase-field model is used to predict the behavior in a common experimental setup that utilizes a half-loop grain configuration in a bicrystal to measure the GB mobility. With a 3-D simulation, we identify the two critical times within the experiments to reach an accurate value of the GB mobility. We use a series of 2-D simulations to investigate the impact of the notch angle on these two critical times. We also show that if the notch does not have a sharp tip, it may immobilize the GB migration indefinitely. Finally, we demonstrate that our approach for the quarter-loop configuration eliminates some disadvantages of the half-loop.

Original languageEnglish (US)
Pages (from-to)1373-1382
Number of pages10
JournalActa Materialia
Volume61
Issue number4
DOIs
StatePublished - Feb 1 2013

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Metals and Alloys
  • Polymers and Plastics
  • Electronic, Optical and Magnetic Materials

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