Abstract
The effects of minor Y additions to the 8090 Al-Li alloy were investigated in the temperature range 293 to 77 K. Results of tensile tests of smooth and notched specimens and Charpy impact toughness tests showed that Y improved the ultimate tensile strength, yield strength, and ductility of the 8090 Al-Li alloy at low temperatures. With decreasing temperature, the elongation of the 8090 Al-Li alloy decreased slightly, but it increased in the Y-containing alloy. At 77 K, elongation of the Y-containing alloy was 46% more than that of the alloy without the Y addition. The addition of Y improved the notched tensile strength and Charpy impact toughness but had little effect on the notch sensitivity. A possible mechanism to explain the phenomena is discussed. The improvements in mechanical properties are due mainly to the more uniform distribution of the S′ (Al2CuMg) phase resulting from the Y addition.
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© 1994 Springer Science+Business Media New York
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Li, Y.Y., Gui, Q.H., Ma, L.M., Jiang, X.J. (1994). Effect of Minor Yttrium Additions on the Mechanical Properties of 8090 Al-Li Alloy at Ambient and Cryogenic Temperatures. In: Reed, R.P., Fickett, F.R., Summers, L.T., Stieg, M. (eds) Advances in Cryogenic Engineering Materials . An International Cryogenic Materials Conference Publication, vol 40. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-9053-5_173
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DOI: https://doi.org/10.1007/978-1-4757-9053-5_173
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