Microstructure and mechanical properties of 2524 aluminum alloy with dislocation loops by various quenching rates

作者：Tian, L. P.; Quan, L. W.^*; Wang, C. C.; Yu, W.; Huang, L. X.; Shin, K. S.; Yu, H.^*

来源：Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing , 2023, 886: 145659.

DOI：10.1016/j.msea.2023.145659

• 2524 aluminum alloy
• Quenching rates
• Dislocation loop
• S phase

The 2524 aluminum alloys with dislocation loops were controlled by different quenching methods and related microstructure and mechanical properties were investigated by transmission electron microscopy. The results show that the higher quenching rate, the larger and uniform dislocation loops obtained. Besides, at initial aging (from 15 min to 1 h), the size of loops increases significantly but shrinks at the peak aging. This is due to the stronger growth effect of vacancies on dislocation loops than that of the contraction influence of line tension at the very beginning of aging, while the loops shrink into smaller sizes when the concentration of vacancies de-creases at peak aging. The best mechanical properties are acquired for the alloy quenched in cold water since S phases distributed on dislocation loops as strengthening phases. In contrast, the S phases play a strengthening role together with the GPB zones in air-quenched sample.