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Differential scanning calorimetry evaluation of retrogressed and re-aged microstructures in aluminum alloy 7075

1986; Elsevier BV; Volume: 79; Issue: 1 Linguagem: Inglês

10.1016/0025-5416(86)90391-5

1873-4928

John M. Papazian,

Aluminum Alloys Composites Properties

Differential scanning calorimetry (DSC) experiments were performed to evaluate the effects of retrogression and re-aging heat treatments on the precipitate microstructures of aluminum alloy 7075 in the T651 temper condition. The retrogression heat treatments varied from 15 to 240 s at temperatures between 220 and 270°C; the re-aging treatment was 24 h at 120°C. DSC analyses showed that both retrogression treatments and retrogression and re-aging treatments caused significant changes in the precipitate microstructures. It was found that the retrogression treatments caused precipitate dissolution and overaging and that the progress of this treatment could be accurately evaluated by DSC analysis. The final microstructure was found to be highly dependent on the retrogression treatment, and the final microstructure was both unique and significantly different from the T651 and T73 conditions.