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<p>During the last decades, the retrogression and re-aging (RRA) process has proven to be a reliable method to simultaneously attain a high strength and suitable corrosion resistance in the 7xxx aluminum alloy series. In this work, room temperature (RT) formability of 7075 aluminum alloy sheets through various stages of RRA has been investigated using forming limit diagrams (FLD) and Erichsen tests. The tests were performed at several RRA conditions and compared with those of annealed (O), peak-aged (T6), and over-aged (T73) tempers. Mechanical properties were characterized using hardness and tensile testing in conjunction with SEM fractography. It was found that retrogression improves formability in all conditions, but when it was followed by re-aging, a non-uniform behavior in formability and mechanical properties was observed depending on re-aging time and temperature. It was concluded that retrogression improves the formability in almost all cases with an average of 12.41%, while a negative effect by the re-aging stage is observed. Generally, RRA improves both strength and formability compared to T6 temper with an average of 5.32%.</p>

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Retrogression and Re-aging Effect on AA7075-T6 Formability

  • 期刊论文

  • 发表日期：

    2025年3月13日

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  • Mustafa Abazari,
  • Ali Karimi-Taheri,
  • Hossein Ebrahimi,
  • Mohammad Abazari

摘要

During the last decades, the retrogression and re-aging (RRA) process has proven to be a reliable method to simultaneously attain a high strength and suitable corrosion resistance in the 7xxx aluminum alloy series. In this work, room temperature (RT) formability of 7075 aluminum alloy sheets through various stages of RRA has been investigated using forming limit diagrams (FLD) and Erichsen tests. The tests were performed at several RRA conditions and compared with those of annealed (O), peak-aged (T6), and over-aged (T73) tempers. Mechanical properties were characterized using hardness and tensile testing in conjunction with SEM fractography. It was found that retrogression improves formability in all conditions, but when it was followed by re-aging, a non-uniform behavior in formability and mechanical properties was observed depending on re-aging time and temperature. It was concluded that retrogression improves the formability in almost all cases with an average of 12.41%, while a negative effect by the re-aging stage is observed. Generally, RRA improves both strength and formability compared to T6 temper with an average of 5.32%.