Double aging and thermomechanical heat treatment of AA7075 aluminum alloy extrusions
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The effects of double aging and thermomechanical double aging on enhancing mechanical properties and accelerating the kinetics of precipitation in aluminum alloy AA7075 were studied by means of hardness tests, tensile tests, and transmission electron microscopy. Using the appropriate heat treatment schedule, the time to peak aging was reduced by a factor of up to 36 without substantial decrease in hardness or tensile properties. The use of appropriate double aging and thermomechanical double aging showed that there can be a significant impact on energy savings and productivity resulting from the accelerated kinetics of precipitation.
KeywordsAging Treatment Aging Temperature Artificial Aging AA7075 Alloy Peak Hardness
The authors are grateful for the assistance of Mr. R. Janota and Prof. S. Mostovoy, IIT. The authors are also grateful for the financial assistance from Kam Kiu Aluminium Group, China.
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