The present study deals with the high temperature characterization of the unconventional, lightweight AA2099 and AA2055 Al-Cu-Li alloys (density = 2.63 g/cm3and 2.71 g/cm3respectively), which are widely employed for aerospace structural components thanks to their high specific strength at room temperature. The alloys have been characterized through tensile tests at 200°C and 250°C, after different overaging heat treatments, with the aim to simulate the variation of mechanical properties occurring in a component operating at high temperature. At 200°C, AA2099 alloy shows equivalent or superior performance compared with AA2055; therefore, it exhibits advantages in terms of specific strength due to its lower density; T1precipitates, dominating AA2099 after overaging, are considered to provide effective strengthening. The reverse occurs at 250°C operating temperature, at which considerable improvements are offered by the combination of both Ω and ϑ′ precipitates, which are present in AA2055 matrix in all overaged conditions.
Balducci, E., Ceschini, L., Messieri, S. (2018). High Temperature Tensile Tests of the Lightweight 2099 and 2055 Al-Cu-Li Alloy: A Comparison. JOM, 70(11), 1-10 [10.1007/s11837-018-3006-x].
High Temperature Tensile Tests of the Lightweight 2099 and 2055 Al-Cu-Li Alloy: A Comparison
Balducci, E.;Ceschini, L.;Messieri, S.
2018
Abstract
The present study deals with the high temperature characterization of the unconventional, lightweight AA2099 and AA2055 Al-Cu-Li alloys (density = 2.63 g/cm3and 2.71 g/cm3respectively), which are widely employed for aerospace structural components thanks to their high specific strength at room temperature. The alloys have been characterized through tensile tests at 200°C and 250°C, after different overaging heat treatments, with the aim to simulate the variation of mechanical properties occurring in a component operating at high temperature. At 200°C, AA2099 alloy shows equivalent or superior performance compared with AA2055; therefore, it exhibits advantages in terms of specific strength due to its lower density; T1precipitates, dominating AA2099 after overaging, are considered to provide effective strengthening. The reverse occurs at 250°C operating temperature, at which considerable improvements are offered by the combination of both Ω and ϑ′ precipitates, which are present in AA2055 matrix in all overaged conditions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
