Characterization of dynamic microstructural evolution of AA7150 aluminum alloy at high strain rate during hot deformation

Fu Lin Jiang, Hui Zhang, Shu Chu Weng, Ding Fa Fu

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The AA7150 aluminum alloy was compressed to various strains at strain rate of 10 s-1 and temperatures of 300 °C and 450 °C, respectively. Flow stress behavior, substructure evolution, morphology and spatial distribution of precipitates were studied based on differential scanning calorimetry analysis and transmission electron microscope observation. The results showed that dynamic flow softening occurs during hot deformation. The main softening mechanism could be concluded as dynamic recovery at 300 °C and continuous dynamic recrystallization at 450 °C. The clear heterogeneous spatial distributions of precipitates are found during deformation and enhanced with increased strain. Higher contents of Cu in T phases are found at 450 °C than at 300 °C, which present a transformation process from T phases to S phases as well. The associated evidence of dynamic precipitation on dislocations and particle-stimulated nucleation, as well as the detailed microstructural inherited relationship and morphological texture (particles preferred orientation) were characterized.

Original languageEnglish
Pages (from-to)51-62
Number of pages12
JournalTransactions of Nonferrous Metals Society of China (English Edition)
Volume26
Issue number1
DOIs
Publication statusPublished - Jan 1 2016

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Geotechnical Engineering and Engineering Geology
  • Metals and Alloys
  • Materials Chemistry

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