Mechanisms of grain boundary migration and growth in nanocrystalline metals under irradiation

Miaomiao Jin, Penghui Cao, Michael P. Short

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Atomistic simulations of radiation damage uncover how grain boundaries (GBs) migrate and coalesce under irradiation in bicrystalline Cu. Planar GB migration biased by defect cluster-mediated attraction first leads to slow and steady motion. Subsequently, adjoining GBs coalesce into curved surfaces, where curvature-driven migration with a velocity three orders of magnitude higher than that of a planar boundary dominates motion, triggering rapid grain growth. This study reveals the atomistic mechanisms of radiation-induced grain growth, and has practical implications towards engineering radiation-tolerant nanostructures.

Original languageEnglish (US)
Pages (from-to)66-70
Number of pages5
JournalScripta Materialia
Volume163
DOIs
StatePublished - Apr 1 2019

All Science Journal Classification (ASJC) codes

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

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