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Effect of Yttrium on Cryogenic Mechanical Properties and Fracture Behavior of Al-Li-Cu-Mg-Zr Alloy

  • L. M. Ma
  • G. J. Liang
  • Y. Y. Li
  • H. M. Lee
  • S. H. Nahm
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)

Abstract

The effect of various contents (0.07 and 0.23 Wt-%) of rare earth (RE) element yttrium on cryogenic mechanical properties and fracture behavior of an Al-Li-Cu-Mg-Zr alloy has been studied at temperatures from 295 to 4 K. Y increased the yield strength, ultimate tensile strength, elongation, and notched tensile strength of the alloy at ambient and cryogenic temperatures. However, Y had less effect on the notch sensitivity and fracture toughness of the alloy. The better properties of the alloy can be obtained by addition of 0.23%Y. At peak-aged condition and cryogenic temperatures, the alloy (without Y) showed mixed fracture mode, the starting-fracture zone showed a cleavage-like fracture. Y addition improved the fracture resistance of the alloy, turned the mixed fracture mode into transgranular ductile fracture, and made the cleavage-like fracture in starting-fracture zone disappeared. The reasons of the improvements of properties and fracture resistance are attributed to the finer grains and S (Al2CuMg) phase homogeneous distribution induced by Y addition.

Keywords

Fracture Toughness Ultimate Tensile Strength Slip Band Fracture Resistance Stress Concentration Factor 
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.

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Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • L. M. Ma
    • 1
  • G. J. Liang
    • 1
  • Y. Y. Li
    • 1
  • H. M. Lee
    • 1
    • 2
  • S. H. Nahm
    • 1
    • 2
  1. 1.Institute of Metal ResearchAcademia SinicaShenyangChina
  2. 2.Korea Research InstituteStandards and ScienceTaejonKorea

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