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First-Principles Insights into Complex Interplays Among Nano-Phases in an Al-Cu-Li-Zr Alloy

SSRN, ISSN: 1556-5068
2022
  • 5
    Citations
  • 233
    Usage
  • 0
    Captures
  • 0
    Mentions
  • 0
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    5
    • Citation Indexes
      5
  • Usage
    233
    • Abstract Views
      203
    • Downloads
      30

Article Description

Multiple nano-phases and nano-complexes feature the typical microstructures of current commercial Al-Li alloys. We present a combined first-principles and scanning transmission electron microscopy study of various nano-features in an aged Al-Cu-Li-Zr alloy. Many fundamental aspects of their formation and interaction have been elucidated from first-principles energetics. Highly-diffusive excess Li can segregate to the early-precipitated β’(L1 -AlZr) nano-phase to develop a tentative δ’(L1 -AlLi) shell at the early-aging stage. The δ’ shell can promote GP-zone precipitation along the (100) facets but is metastable only, and will eventually dissolve into β’ with time. Consequently, GP-zones can evolve into θ'' and θ’ independently during the prolonged aging. Excess Li weakly segregates to θ’ interfaces to develop an 'in-phase' or 'anti-phase' δ’ shell. The gained insights help clarify various experimental observations, and their implications on Al-Li alloy design are also discussed.

Bibliographic Details

Zhengqing Liu; Yong Jiang; Yiren Wang; Peipei Ma; Chunhui Liu

Elsevier BV

Multidisciplinary; Al-Cu-Li alloy; nano-phase; Interface; electron microscopy; first-principles

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