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Retrogression and Reaging of AA7075 and AA6013 Aluminum Alloys
Metallurgical and Materials Transactions A ( IF 2.8 ) Pub Date : 2021-01-23 , DOI: 10.1007/s11661-020-06133-0
Katherine E. Rader , Jon T. Carter , Louis G. Hector , Eric M. Taleff

Retrogression and reaging (RRA) is of interest to the automotive industry for manufacturing components of high-strength aluminum alloys. RRA heat treatments are investigated for AA7075-T6 and AA6013-T6 materials. Retrogression is demonstrated to be a thermally activated process reasonably characterized with a single activation energy. Activation energies for retrogression are measured as 97 ± 7 and 160 ± 30 kJ/mol for AA7075-T6 and AA6013-T6, respectively. Critical retrogression times, tR* and t maxR , are defined and measured across a range of retrogression temperatures. These data are used with the concept of reduced time to predict combinations of temperature and time that produce successful retrogression heat treatments. Recommended retrogression heat treatments are 200 °C for 3 to 12 minutes for AA7075-T6 and 240 °C for 7 minutes for AA6013-T6. Data from reaging heat treatments confirm a significant RRA response in AA6013. Recommended reaging heat treatments are 120 °C for 24 hours for retrogressed AA7075 and 190 °C for 1 hour for retrogressed AA6013. A reaging heat treatment that simulates the automotive paint-bake cycle, 185 °C for 25 minutes, is almost as effective as the recommended reaging heat treatment for AA6013 but is significantly less effective than the recommended reaging heat treatment for AA7075.



中文翻译:

AA7075和AA6013铝合金的回退和时效处理

回归和时效处理(RRA)是汽车行业用于制造高强度铝合金部件的兴趣所在。研究了RRA热处理对AAA7075-T6和AA6013-T6材料的影响。倒退被证明是合理地以单一活化能为特征的热活化过程。对于AA7075-T6和AA6013-T6,用于回归的活化能分别测量为97±7和160±30 kJ / mol。临界回归时间,t R *和t max R 在一系列的回归温度范围内定义和测量。这些数据与减少时间的概念一起用于预测成功进行回归热处理的温度和时间的组合。推荐的回归热处理是AA7075-T6 200°C 3至12分钟,AA6013-T6 240°C 7分钟。从再热处理中获得的数据证实了AA6013中具有显着的RRA反应。推荐的再老化热处理是AA7075的回缩温度为120°C 24小时,AAA6013的回缩热处理温度为190°C 1小时。模拟汽车喷漆烘烤周期(在185°C下进行25分钟)的重老化热处理几乎与推荐的AA6013的重老化热处理一样有效,但远不如推荐的AA7075的重老化热处理有效。

更新日期:2021-01-24
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