Phase evolution in two-phase alloys during severe plastic deformation

Nirab Pant, Nisha Verma, Yinon Ashkenazy, Pascal Bellon, Robert S. Averback

Research output: Contribution to journalArticlepeer-review

Abstract

Phase evolution in FCC metals with strongly interacting alloy components during severe plastic deformation is investigated using molecular dynamics simulations. Specifically, we study the alloy microstructure in steady state, nucleation and growth of precipitates in supersaturated alloys, and the dissolution of precipitates in undersaturated alloys. The results are compared to a modified effective temperature model, providing a physical understanding for the atomic processes underlying the model and a perspective on its strengths and weaknesses. Key observations in this work are nucleation and growth of precipitates during SPD at a temperature of 100 K; Gibbs-Thomson-like behavior relating steady-state solubility to precipitate size under sustained shearing; a direct relationship between the effective temperature and the shear modulus; and the importance of cluster agglomeration during precipitate growth. The study also reveals that the mechanism of forced chemical mixing depends on precipitate size, adding complications for effective temperature models describing inhomogeneous systems. The simulations are shown to provide good semi-quantitative agreement with experimental findings reported in the literature.

Original languageEnglish (US)
Article number116826
JournalActa Materialia
Volume210
DOIs
StatePublished - May 15 2021

Keywords

  • Effective temperature model
  • Low-temperature deformation
  • Molecular dynamics simulations
  • Non-equilibrium processing
  • Severe plastic deformation (SPD)

ASJC Scopus subject areas

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

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