High Temperature Tensile Tests of the Lightweight 2099 and 2055 Al-Cu-Li Alloy: A Comparison
- 134 Downloads
The present study deals with the high temperature characterization of the unconventional, lightweight AA2099 and AA2055 Al-Cu-Li alloys (density = 2.63 g/cm3 and 2.71 g/cm3 respectively), 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; T1 precipitates, 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.
The authors gratefully acknowledge Ducati Spa for the technical support.
- 2.C.J. Peel, B. Evans, C.A. Baker, D.A. Bennet, P.J. Gregson, and H.M. Flower, The development of aluminium-lithium alloys, in ed. by T.H. Sanders, E.A. Starke, Second International Conference on Aluminum Alloys (1984), pp. 363–392.Google Scholar
- 3.N.E. Prasad, A.A. Gokhale, and R.J.H. Wanhill, eds., Aluminium-Lithium Alloys: Processing, Properties, and Applications (Oxford: Butterworth-Heinemann, 2014). https://doi.org/10.1016/B978-0-12-401698-9.00018-5.CrossRefGoogle Scholar
- 4.Alcoa, ALLOY 2099-T83 AND 2099-T8E67 EXTRUSIONS (2005). https://www.arconic.com/hard_alloy_extrusions/catalog/pdf/alloy2099techsheet.pdf.
- 5.Arconic, Aluminum alloy 2055-T84 extrusions (2016).Google Scholar
- 6.European Commission—Climate Action. https://ec.europa.eu/clima/policies/transport/vehicles/proposal_en. Accessed 1 Jan 2018.
- 7.T. Warner, Mater. Sci. Forum 519–521, 1271 (2006). https://doi.org/10.4028/www.scientific.net/MSF.519-521.1271.CrossRefGoogle Scholar
- 33.V.G. Davydov, L.B. Ber, V.N. Ananiev, A.I. Orozov, and M. V. Samarina, The heat treatment effect on thermal stability of Al-Li alloys at low temperatures, in ICAA-6, 1998, pp. 985–990.Google Scholar
- 37.G.E. Totten and D.S. MacKenzie, Volume 2: Alloy production and Materials Manufacturing, in Handb. Alum. (2003), p. 731.Google Scholar
- 38.W.D. Callister and D.G. Rethwisch, Materials Science and Engineering (Hoboken: Wiley, 2011).Google Scholar