Advertisement

Effect of Minor Yttrium Additions on the Mechanical Properties of 8090 Al-Li Alloy at Ambient and Cryogenic Temperatures

  • Y. Y. Li
  • Q. H. Gui
  • L. M. Ma
  • X. J. Jiang
Part of the An International Cryogenic Materials Conference Publication book series (ACRE, volume 40)

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.

Keywords

Ultimate Tensile Strength Planar Slip Charpy Impact Notch Sensitivity Charpy Impact Toughness 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    D. Webster, The effect of low melting point impurities on the properties of Al-Li alloy, Metall. Trans. 18A: 2181 (1987).CrossRefGoogle Scholar
  2. 2.
    Z.Q. Zhou, Al-Li alloys in the Soviet Union, Military Mater. Sci. Eng. (Chinese translation from Russian) 10: 29 (1991).Google Scholar
  3. 3.
    Q.H. Gui, X.J. Jiang, L.M. Ma, Y.Y. Li, Effect of minor yttrium on precipitate-phase and mechanical properties of Al-Li alloy, Acta Metall. Sinica 29: A165 (1993).Google Scholar
  4. 4.
    T.H. Sanders, Jr. and E.A. Starker, Jr., Acta Metall. 30: 927 (1982).CrossRefGoogle Scholar
  5. 5.
    L.M. Ma, Q.H. Gui, G.J. Liang, X.J. Jiang, and Y.Y. Li, Effect of yttrium on the behavior of low-temperature deformation and fracture of 8090A1-Li alloy, to be published in “Proc. of Chinese Second Conference on Al-Li Alloys,” Chinese Society of Metals, Changsha, China (1993).Google Scholar

Copyright information

© Springer Science+Business Media New York 1994

Authors and Affiliations

  • Y. Y. Li
    • 1
  • Q. H. Gui
    • 1
  • L. M. Ma
    • 1
  • X. J. Jiang
    • 1
  1. 1.Institute of Metal ResearchAcademia SinicaShenyangChina

Personalised recommendations