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An Examination of Anisotropic Void Evolution in Aluminum Alloy 7075

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This paper investigates the anisotropy of void evolution and its relation with ductility in the high strength rolled aluminum alloy 7075-T7351. Smooth tension specimens are extracted from three principal material orientations, i.e. rolling (R), transverse (T), and short transverse (S). The mechanical behavior of these specimens is characterized and the varying ductility in the three orientations is clearly observed. Electron Backscattered Diffraction (EBSD), optical microscopy, and Scanning Electron Microscopy (SEM) are employed to characterize the grain structure and the size, location, and chemical composition of the intermetallic particles. In-situ X-ray Tomography (XCT) experiments are performed to obtain tomographic images of the specimens at critical loading steps. The radiographs acquired during the tensile test are then reconstructed and examined through quantitative analysis to partition particles and voids. These tomographic images enable us to visualize void evolution as the specimens are loaded along material orientations. The tomographic images clearly illustrate anisotropy in the void evolution and highlight the importance of local coalescence in developing 1D and 2D void structures prior to global coalescence. Fractography confirms tomography. These findings motivate model forms with appropriate internal variables to adequately describe the dominant mechanisms which govern anisotropic void evolution.

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  1. 1.

    ASM Handbook, Volume 02 - Properties and Selection: Nonferrous Alloys and Special-Purpose Materials. ASM, 1990. 4.58: 7075, Alclad 7075 5.6Zn-2.5Mg-1.6Cu-0.23Cr

  2. 2.

    Tirosh J, Shirizly A, Rubinski L (1999) Evolution of anisotropy in the compliances of porous materials during plastic stretching or rolling - analysis and experiments. Mech Mater 31:449–460

  3. 3.

    Garrison WM, Moody NR (1987) Ductile fracture. J Phys Chem Solids 48(11):1035–1074

  4. 4.

    Tvergaard V, Needleman A (2006) Three dimensional microstructural effects on plane strain ductile crack growth. Int J Solids Struct 43:6165–6179

  5. 5.

    Rice JR, Tracey DM (1969) On the ductile enlargement of voids in triaxial stress fields. J Mech Phys Solids 17:201–217

  6. 6.

    Gurson AL (1977) Continuum theory of ductile rupture by void nucleation and growth: part I - yield criteria and flow rules for porous ductile media. J Eng Mater - T ASME 99(1):2–15

  7. 7.

    Thomason PF (1993) Ductile fracture by the growth and coalescence of microvoids of non-uniform size and spacing. Acta Metall Mater 58:2127–2134

  8. 8.

    Ortiz M, Molinari A (1992) Effect of strain-hardening and rate sensitivity on the dynamic growth of a void in a plastic material. J Appl Mech - T ASME 59(1):48–53

  9. 9.

    Weinberg K, Mota A, Ortiz M (2006) A variational constitutive model for porous metal plasticity. Comp Mech 37:142–152

  10. 10.

    Benzerga AA, Leblond J-P (2010) Ductile fracture by void growth and coalescence. Adv Appl Mech 44:170–297

  11. 11.

    Agarwal H, Gokhale AM, Horstemeyer MF, Graham S (2002) Quantitative characterization of three-dimensional damage evolution in a wrought al-alloy under tension and compression. Metall Mater Trans A 33A(11):2599–2606

  12. 12.

    Agarwal H, Gokhale AM, Graham S, Horstemeyer MF (2003) Void growth in 6061-aluminum alloy under triaxial stress state. Mater Sci Eng A 342:35–42

  13. 13.

    Jordon JB, Horstemeyer MF, Solanki K, Bernald JD, Berry JT, Williams TN (2009) Damage characterization and modeling of a 7075-t651 aluminum plate. Mater Sci Eng A 527:169–178

  14. 14.

    Baruchel J, Buffiere JY, Maire E, Merle P, Peix G (2000) X-ray tomography in material science.Hermes Science Publications, Paris

  15. 15.

    Babout L, Ludwig L, Maire E, Buffiere JY (2003) Damage assessment in metallic structural materials using high resolution synchrotron X-ray tomography. Nucl Instrum Meth B 200:303–307

  16. 16.

    Qian L, Toda H, Uesugi K, Ohgaki T, Kobayashi M, Kobayashi T (2008) Three-dimensional visualization of ductile fracture in an Al-Si alloy by high-resolution synchrotron X-ray microtomography. Mater Sci Eng A 483-484:293–296

  17. 17.

    Morgeneyer TF, Starink MJ, Sinclair I (2008) Evolution of voids during ductile crack propagation in an aluminum alloy sheet toughness test studied by synchrotron radiation computed tomography. Act Mater 56:1671–1679

  18. 18.

    Maire E, Zhou S, Adrien J, Dimichiel M (2011) Damage quantification in aluminum alloys using in situ tensile tests in X-ray tomography. Eng Frac Mech 78:2679–2690

  19. 19.

    Polmear IJ (1995) Light Alloys, Metallurgy of the Light Metals, 3rd edn. Wiley

  20. 20.

    Barth HD, Launey ME, MacDowell AA, Ager III JW, Ritchie RO (2010) On the effect of X-ray irradiation on the deformation and fracture behavior of human cortical bone. Bone 46:1475–1485

  21. 21.

    Fischler MA, Bolles RC (1981) Random sample consensus - a paradigm for model-fitting with applications to image-analysis and automated cartography. Communications of The ACM 24(6):381–395. ISSN 0001-0782

  22. 22.

    Thomason PF (1990) Ductile facture of metals. Pergamon Press

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Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy’s National Nuclear Security Administration under contract DE-AC04-94AL85000. The authors greatly appreciate the help from the staff members Alastair MacDowell, Dula Parkinson and Jamie Nasiatka at the Advanced Light Source, Lawrence-Berkeley National Laboratory.

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Correspondence to H. Jin.

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Jin, H., Lu, W., Foulk, J.W. et al. An Examination of Anisotropic Void Evolution in Aluminum Alloy 7075. Exp Mech 53, 1583–1596 (2013).

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  • Anisotropy
  • Void evolution
  • X-ray tomography