Journal of Materials Science

, 43:7403 | Cite as

Dynamic observations of deformation in an ultrafine-grained Al–Mg alloy with bimodal grain structure

  • Byungmin Ahn
  • Enrique J. Lavernia
  • Steven R. Nutt
Ultrafine-Grained Materials

Abstract

The tensile properties and deformation response of an ultrafine-grained (UFG) Al–Mg alloy with bimodal grain structure were investigated using a micro-straining unit and a strain mapping technique. Atomized Al 5083 powder was ball-milled in liquid N2 to obtain a nanocrystalline (NC) structure, then blended with 50 wt.% unmilled coarse-grained (CG) powder, and consolidated to produce a bimodal grain structure. The blended powder was hot vacuum degassed to remove residual contaminants, consolidated by cold isostatic pressing (CIP), and then quasi-isostatic (QI) forged twice. The resultant material consisted of a UFG matrix and CG regions. The dynamic response during tensile deformation was observed using a light microscope, and the surface displacements were mapped and visualized using a digital image correlation (DIC) technique. The DIC results showed inhomogeneous strain between the UFG and CG regions after yielding, and the strain was localized primarily in the CG regions. Strain hardening in the CG regions accompanied the localization and was confirmed by variations in Vickers hardness.

References

  1. 1.
    Gleiter H (1989) Prog Mater Sci 33:223. doi:10.1016/0079-6425(89)90001-7 CrossRefGoogle Scholar
  2. 2.
    Weertman JR, Averback RS (1996) In: Edelstein AS, Cammarata RC (eds) Nanomaterials: synthesis, properties and applications. Institute of Physics Publishing, Bristol, p 323Google Scholar
  3. 3.
    Newbery AP, Han BQ, Lavernia EJ, Suryanarayana C, Christodoulou JA (2007) In: Groza JR, Shackelford JF, Lavernia EJ, Powers MT (eds) Materials processing handbook. CRC Press, Boca Raton, FA, p 13–1Google Scholar
  4. 4.
    Hall EQ (1951) Proc Soc Lond B64:747ADSGoogle Scholar
  5. 5.
    Petch NJ (1953) J Iron Steel Inst 174:25Google Scholar
  6. 6.
    Suryanarayana C (2001) Prog Mater Sci 46:1. doi:10.1016/S0079-6425(99)00010-9 CrossRefGoogle Scholar
  7. 7.
    Witkin DB, Lavernia EJ (2006) Prog Mater Sci 51:1. doi:10.1016/j.pmatsci.2005.04.004 CrossRefGoogle Scholar
  8. 8.
    Valiev RZ, Islamgaliev RK, Alexandrov IV (2000) Prog Mater Sci 45:103. doi:10.1016/S0079-6425(99)00007-9 CrossRefGoogle Scholar
  9. 9.
    Sanders PG, Fougere GE, Thompson LJ, Eastman JA, Weertman JR (1997) Nanostruct Mater 8:243. doi:10.1016/S0965-9773(97)00167-0 CrossRefGoogle Scholar
  10. 10.
    Erb U (1995) Nanostruct Mater 6:533. doi:10.1016/0965-9773(95)00114-X CrossRefGoogle Scholar
  11. 11.
    Wang Y, Chen M, Zhou F, Ma E (2002) Nature 419:912. doi:10.1038/nature01133 PubMedCrossRefADSGoogle Scholar
  12. 12.
    He G, Eckert J, Loser W, Schultz L (2002) Nat Mater 2:33. doi:10.1038/nmat792 CrossRefADSGoogle Scholar
  13. 13.
    Tellkamp VL, Melmed A, Lavernia EJ (2001) Metall Mater Trans 32A:2335. doi:10.1007/s11661-001-0207-6 CrossRefGoogle Scholar
  14. 14.
    Youssef KM, Scattergood RO, Murty KL, Koch CC (2006) Scr Mater 54:251. doi:10.1016/j.scriptamat.2005.09.028 CrossRefGoogle Scholar
  15. 15.
    Han BQ, Lee Z, Witkin D, Nutt S, Lavernia EJ (2005) Metall Mater Trans 36A:957. doi:10.1007/s11661-005-0289-7 CrossRefGoogle Scholar
  16. 16.
    Lee Z, Witkin DB, Radmilovic V, Lavernia EJ, Nutt SR (2005) Mater Sci Eng A 410–411:462. doi:10.1016/j.msea.2005.08.104 Google Scholar
  17. 17.
    Chan HW (1988) Mater Des 9:355Google Scholar
  18. 18.
    Newbery AP, Ahn B, Pao P, Nutt SR, Lavernia EJ (2007) Adv Mater Res 29–30:21CrossRefGoogle Scholar
  19. 19.
    Sutton MA, Cheng M, Peters WH, Chao YJ, McNeill SR (1986) Image Vis Comput 4(3):143. doi:10.1016/0262-8856(86)90057-0 CrossRefGoogle Scholar
  20. 20.
    Ahn B, Newbery AP, Lavernia EJ, Nutt SR (2007) Mater Sci Eng A 463:61. doi:10.1016/j.msea.2006.07.158 CrossRefGoogle Scholar
  21. 21.
    Liao XZ, Zhou F, Lavernia EJ, Srinivasan SG, Baskes MI, He DW, Zhua YT (2003) Appl Phys Lett 83(4):632. doi:10.1063/1.1594836 CrossRefADSGoogle Scholar
  22. 22.
    Han BQ, Lavernia EJ (2005) Adv Eng Mater 7(6):457. doi:10.1002/adem.200400219 CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Byungmin Ahn
    • 1
  • Enrique J. Lavernia
    • 2
  • Steven R. Nutt
    • 1
  1. 1.Department of Chemical Engineering and Materials ScienceUniversity of Southern CaliforniaLos AngelesUnited States
  2. 2.Department of Chemical Engineering and Materials ScienceUniversity of CaliforniaDavisUnited States

Personalised recommendations