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Microstructural evolution in 7075 aluminum alloy during retrogression process: experimental and phase-field modeling

Ebrahimi, H ; Sharif University of Technology | 2023

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  1. Type of Document: Article
  2. DOI: 10.1007/s11665-023-08318-1
  3. Publisher: Springer , 2023
  4. Abstract:
  5. In this research, a phase-field model was developed to investigate the retrogression process in 7075 aluminum alloy sheets. The model predicts the kinetic of metastable η' phase dissolution during retrogression treatment at a prescribed temperature. The input parameters of the model are achieved from experimental and molecular dynamics investigations. To validate the model, the average diameter and size distribution of η' precipitates attained from the developed phase-field model were compared with those measured from transmission electron microscopy examinations. The experimental as well as the model results demonstrated that only a few percent of η' precipitates are dissolved completely after 100 s of retrogression at 200 °C. In this condition, the alloy hardness can be recovered by a re-aging process, but by increasing the retrogression time to 500 s the major part of the precipitates is completely dissolved and the hardness of the alloy cannot be recovered by a re-aging process. © 2023, ASM International
  6. Keywords:
  7. Al-Zn-Mg-based alloys ; Molecular dynamics ; Phase-field modeling ; Retrogression process ; Transmission electron microscopy
  8. Source: Journal of Materials Engineering and Performance ; 2023 ; 10599495 (ISSN)
  9. URL: https://link.springer.com/article/10.1007/s11665-023-08318-1