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Observations on microstructurally sensitive fatigue crack growth in a widmanstätten Ti-6Al-4V alloy

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Abstract

Fatigue crack growth rates in commercial purity Ti-6A1-4V can be substantially reduced with a beta anneal from levels associated with the mill anneal, owing primarily to crystallographic crack bifurcation in the Widmanstätten packets. This microstructurally sensitive fatigue crack growth occurs when the reversed plastic zone is less than the packet size and results in a fracture surface with a faceted morphology. It appears from replica and scanning electron microscopic examination that the facets are comprised of three superposed features,viz cleavage-like river-line patterns, very fine striations and traces of slip lines (and slip-band cracks). Limited X-ray evidence suggests a facet orientation some 8 to 10 degrees off the basal plane.

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Authors and Affiliations

  1. Fatigue Criteria Section, Metals Performance Branch, Engineering Materials Division, Naval Research Laboratory, 20375, Washington, DC

    G. R. Yoder (Metallurgist), L. A. Cooley (Metallurgist) & T. W. Crooker (Head)

Authors
  1. G. R. Yoder
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  2. L. A. Cooley
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  3. T. W. Crooker
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Yoder, G.R., Cooley, L.A. & Crooker, T.W. Observations on microstructurally sensitive fatigue crack growth in a widmanstätten Ti-6Al-4V alloy. Metall Trans A 8, 1737–1743 (1977). https://doi.org/10.1007/BF02646877

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