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Fatigue crack growth and fracture toughness behavior of an Al-Li-Cu alloy

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Abstract

Slip behavior, fracture toughness, and fatigue thresholds of a high purity Al-Li-Cu alloy with Zr as a dispersoid forming element have been studied as a function of aging time. The fracture toughness variation with aging time has been related to the changes in slip planarity,i.e., slip band spacing and width. Although the current alloy exhibits planar slip for all aging conditions examined, the crack initiation toughness,Klc, compares favorably with those of 2XXX and 7XXX aluminum alloys. Near threshold fatigue crack growth results in air and vacuum suggest that irregularities in the crack profile and the fracture surfaces and slip reversibility are some of the major contributing factors to the crack growth resistance of this alloy.

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Authors and Affiliations

  1. Department of Materials Science, The University of Virginia, Thornton Hall, 22901, Charlottesville, VA

    K. V. Jata (Research Assistant Professor)

  2. School of Engineering and Applied Science, The University of Virginia, Thornton Hall, 22901, Charlottesville, VA

    E. A. Starke (Earnest Oglesby Professor of Materials Science and Dean)

Authors
  1. K. V. Jata
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  2. E. A. Starke
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Jata, K.V., Starke, E.A. Fatigue crack growth and fracture toughness behavior of an Al-Li-Cu alloy. Metall Trans A 17, 1011–1026 (1986). https://doi.org/10.1007/BF02661267

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