Study of θ’ precipitation behavior in Al-Cu-Cd alloys by phase-field modeling

Yisen Hu, Gang Wang, Yanzhou Ji, Liping Wang, Yiming Rong, Long Qing Chen

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

The θ’(Al 2 Cu) precipitation behavior of Al-Cu-Cd alloys was investigated by phase-field simulations. Due to the formation of Cu-Cd-vacancy clusters, the diffusion of Cu in the Al matrix is replaced by the movement of the clusters. Thus the diffusion model was modified and the diffusion coefficient of Cu-Cd-vacancy clusters was used in the new model. Moreover, the interfacial energy of θ’ phase is reduced by the Cd atoms segregation at the α(Al)/θ’ interface. Therefore, multiple combinations of coherent and semi-coherent interfacial energies were compared regarding the growth kinetics of θ’ phase in the simulation. The results indicated that the variation of the diameter-to-thickness ratio of θ’ phase primarily depended on the coherent interfacial energy. And the equilibrium diameter was a monotonically increasing function of the diameter-thickness ratio. Appropriate coherent and semi-coherent interfacial energies were obtained based on a comparison of the diameter-thickness ratio between the phase-field simulations and experimental data. The yield strength was calculated considering the morphology of the θ’ phases and was validated by experimental results for different Al-Cu-Cd alloys.

Original languageEnglish (US)
Pages (from-to)105-114
Number of pages10
JournalMaterials Science and Engineering A
Volume746
DOIs
StatePublished - Feb 11 2019

All Science Journal Classification (ASJC) codes

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

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