Computer simulation of the kinetics of order disorder and phase separation during precipitation of δ′ (Al3Li) in Al-Li alloys

R. Poduri, L. Q. Chen

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Abstract

A computer simulation study has been performed of the reaction paths for the precipitation of δ′ (Al3Li) ordered particles from a disordered matrix (α) in Al-Li alloys, using microscopic Langévin diffusion equations. It is found that the precipitation of δ′ occurs either by a congruent ordering process followed by decomposition, or by a non-classical nucleation mechanism which requires critical fluctuations of both composition and order parameter, except in a narrow range of compositions near the equilibrium phase boundary of the disordered phase, where classical nucleation theory seems to be applicable. Composition and order parameter profiles across a critical nucleus were obtained for different compositions in the nucleation and growth regime, and compared with those obtained from the continuum non-classical nucleation theory. Possible origins for the discrepancies in the precipitation mechanism, obtained from different theoretical and experimental studies, are suggested.

Original languageEnglish (US)
Pages (from-to)245-255
Number of pages11
JournalActa Materialia
Volume45
Issue number1
DOIs
StatePublished - Jan 1997

All Science Journal Classification (ASJC) codes

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

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