Computational investigation of constitutional liquation in Al-Cu alloys

Chao Jiang, Zi-kui Liu

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Constitutional liquation means the local eutectic melting of second-phase particles in a matrix at temperatures above the eutectic temperature and below the solidus of the alloy, which may occur in the heat-affected zone (HAZ) during welding. In the present paper, the constitutional liquation in the Al-Cu system was computationally investigated using the DICTRA program coupled with critically assessed thermodynamic and kinetic databases. Computer simulated results are in quantitative agreement with existing experimental data. The computational procedures for obtaining the critical heating rate to avoid constitutional liquation are demonstrated. The critical heating rate was found to be inversely proportional to the square of the precipitate size. The present computational procedures can be readily extended to predict the susceptibility of multicomponent commercial alloys to constitutional liquation during welding with available thermodynamic and kinetic databases.

Original languageEnglish (US)
Pages (from-to)4447-4459
Number of pages13
JournalActa Materialia
Volume51
Issue number15
DOIs
StatePublished - Sep 3 2003

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Heating rate
Eutectics
Welding
Thermodynamics
Kinetics
Heat affected zone
Precipitates
Melting
Temperature

All Science Journal Classification (ASJC) codes

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

Cite this

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Computational investigation of constitutional liquation in Al-Cu alloys. / Jiang, Chao; Liu, Zi-kui.

In: Acta Materialia, Vol. 51, No. 15, 03.09.2003, p. 4447-4459.

Research output: Contribution to journalArticle

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AB - Constitutional liquation means the local eutectic melting of second-phase particles in a matrix at temperatures above the eutectic temperature and below the solidus of the alloy, which may occur in the heat-affected zone (HAZ) during welding. In the present paper, the constitutional liquation in the Al-Cu system was computationally investigated using the DICTRA program coupled with critically assessed thermodynamic and kinetic databases. Computer simulated results are in quantitative agreement with existing experimental data. The computational procedures for obtaining the critical heating rate to avoid constitutional liquation are demonstrated. The critical heating rate was found to be inversely proportional to the square of the precipitate size. The present computational procedures can be readily extended to predict the susceptibility of multicomponent commercial alloys to constitutional liquation during welding with available thermodynamic and kinetic databases.

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