Fatigue crack growth and fracture toughness behavior of an Al-Li-Cu alloy |
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| Authors: | K V Jata E A Starke |
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| Affiliation: | (1) Department of Materials Science, The University of Virginia, Thornton Hall, 22901 Charlottesville, VA;(2) School of Engineering and Applied Science, The University of Virginia, Thornton Hall, 22901 Charlottesville, VA |
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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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