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    • Keywords

       

      Quaternary Al-Li-Cu-Mg alloys; microstructure; texture; anisotropy; tensile; low cycle fatigue; strength differential; fracture resistance

    • Abstract

       

      Considerable anisotropy in the mechanical properties of quaternary Al-Li-Cu-Mg alloys was observed in both plate and sheet products. These alloys showed more than 100% increase in tensile ductility in the test direction oriented at 45–60° to the rolling direction as compared to that in the rolling direction (longitudinal, L). A concomitant decrease in strength was also found. These alloys exhibit superior low cycle fatigue resistance in the long-transverse (LT) direction as compared to the longitudinal (L) direction. Another observation is the occurrence of strength differential (S-D), which is seen to be directional. The trends in S-D are similar under monotonic as well as cyclic loading conditions. The fracture resistance is also highly anisotropic. An attempt is made here to correlate the observed anisotropy in the mechanical behaviour of these alloys with the microstructure and crystallographic texture.

    • Author Affiliations

       

      N Eswara Prasad1 G Malakondaiah1

      1. Defence Metallurgical Research Laboratory, P.O. Kanchanbagh, Hyderabad - 500 258, India
    • Dates

       
  • Bulletin of Materials Science | News

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