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Environmental Fatigue-Crack Surface Crystallography for Al-Zn-Cu-Mg-Mn/Zr

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Abstract

The scanning electron microscope (SEM)–based electron backscattered diffraction (EBSD)/stereology technique quantitatively establishes distributions of the crystallographic characteristics of environmental-fatigue crack features for slightly overaged Al-Zn-Cu-Mg-X (X = Zr or Mn) alloys stressed in the low-growth-rate regime. Results for these homogeneous slip alloys conform to a substantial companion study of planar slip-prone Al-Cu-Mg/Li. Transgranular-crack characteristics are similar for the Mn and Zr variants, independent of grain size and recrystallization. Two morphologies of facetlike features exhibit a wide range of crystallographic orientations, change character at grain boundaries indicating an important role of grain orientation, and form in highly tensile-stressed spatial orientations about a crack tip. Similar characteristics for Al-Zn and Al-Cu suggest a common damage mechanism, speculatively attributed to hydrogen-environment embrittlement by decohesion. Slip-deformation band cracking resulting in facets near {111}, stimulated by H-enhanced localized plasticity, is not a viable mechanism for environmental fatigue. Repetitively stepped facets with surface curvature may involve H-enhanced cleavage along {100} or {110} planes subsequently distorted by plasticity. Broad-flat facets speculatively result from tensile stress-based cracking through dislocation cell structure, evolved by cyclic plasticity and containing trapped H.

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Notes

  1. L = Longitudinal (rolling and loading directions), T = transverse (width and crack propagation directions), and S = short transverse (thickness) direction.

  2. JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.

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Acknowledgments

This research was supported by the United States Air Force Office of Scientific Research (Grant No. F46920-03-1-0155) with Dr. Brett Conner as Scientific Officer, the ALCOA Technical Center with Dr. G.H. Bray as technical advisor, and the National Institute for Aerospace (Contract No. 6010-UV) with Dr. S. Smith of the NASA–Langley Research Center as technical monitor. The authors thank Professor A.D. Rollett, Carnegie Mellon University, for constructive discussions.

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  1. Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, 22904-4745, USA

    YunJo Ro (Graduate Student), Sean R. Agnew (Associate Professor) & Richard P. Gangloff (Ferman W. Perry Professor)

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  1. YunJo Ro
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  2. Sean R. Agnew
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  3. Richard P. Gangloff
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Correspondence to Richard P. Gangloff.

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Manuscript submitted March 29, 2007.

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Ro, Y., Agnew, S.R. & Gangloff, R.P. Environmental Fatigue-Crack Surface Crystallography for Al-Zn-Cu-Mg-Mn/Zr. Metall Mater Trans A 39, 1449–1465 (2008). https://doi.org/10.1007/s11661-008-9522-5

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