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The differential cooling of aluminum alloys in heat treatment quenching often results in residual stresses, prediction of which requires constitutive properties data on the thermomechanical response of the material. This work focuses on measuring the thermomechanical constitutive behavior needed for modeling residual stress development during the heat treatment quenching of high-strength 7050 aluminum alloy. These data are used in models based on either temperature dependent stress-relaxation or flow-stress responses. Existing constitutive data for 7050 found in the open literature does not capture the material response in the temperature range, stain rate range, or microstructural condition found during quenching following a solution heat treatment. Compression tests were performed in the range of 100 to 450 degrees Celsius with strain rates of 0.00001 to 0.001 1/s on an MTS Insight mechanical testing machine to produce true stress, true strain curves for the flow stress models. Data for the stress-relaxation were collected from tests performed in the range of 100 to 450 degrees Celsius. Force, displacement, and time data were converted to strain rate vs stress curves for the stress relaxation model. The mechanical tests will produce data for the 7050 alloy in the post heat treatment cooling condition over temperature and strain rate ranges applicable to heat treatment quenching. Such datasets will enable improved modeling of residual stress development during the heat treatment quenching of 7050 aluminum.

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Purdue University / 2023

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