Journal of Materials Science

, Volume 44, Issue 2, pp 676–679 | Cite as

Orientation relationships and morphology of S phase in friction stir welded Al–Cu–Mg alloy

  • A. K. ShuklaEmail author
  • W. A. BaeslackIII

It is generally believed that S phase has lath-morphology. Both lath and rod-shaped S phase were observed in the present study and a closer observation of the selected area diffraction patterns (SADPs) revealed an interesting difference in their orientation relationship with the matrix. A modified orientation relationship has been recently discovered and related to the S phase morpholgy. Although at this time, the effect of the orientation relationship and morphology of S phase on the mechanical properties of Al–Cu–Mg alloys is not understood, it is worthwhile to investigate this observation for increasing the understanding of S phase precipitation and growth. Although there have been several investigations relating to the microstructure of friction stir welds in Al–Cu–Mg alloys [1, 2, 3, 4], precipitation and growth of S phase in these welds have not been adequately addressed.

Two friction stir welds produced on 1-mm thick 2024-T3 commercial aluminum alloy (Al–4.4Cu–1.5Mg–0.5Mn) using...


HRTEM Orientation Relationship Heat Affected Zone Heat Affected Zone Friction Stir Welding 



The authors would like to thank Dr. Libor Kovarik for the useful discussions.


  1. 1.
    Genevois C, Deschamps A, Denquin A, Doisneau-Cottignies B (2005) Acta Mater 53:2447CrossRefGoogle Scholar
  2. 2.
    Gerlich A, Su P, Yamamoto M, North TH (2007) J Mater Sci 42:5589. doi: CrossRefGoogle Scholar
  3. 3.
    Lityńska L, Braun R, Staniek G, Dalle Donne C, Dutkiewicz J (2003) Mater Chem Phys 81:293CrossRefGoogle Scholar
  4. 4.
    Sukedai E, Maebara T, Okayama T (2008) EMC 2008 14th European microscopy congress, Aachen, Germany, 1–5 September 2008Google Scholar
  5. 5.
    Bagaryatskii YA (1952) Doklady Akademii Nauk SSSR 87:559Google Scholar
  6. 6.
    Bagaryatskii YA (1952) Doklady Akademii Nauk SSSR 87:397Google Scholar
  7. 7.
    Silcock JM (1961) J Inst Met 89:203Google Scholar
  8. 8.
    Kovarik L, Miller MA, Court SA, Mills MJ (2006) Acta Mater 54:1731CrossRefGoogle Scholar
  9. 9.
    Radmilovic V, Kilaas R, Dahmen U, Shiflet GJ (1999) Acta Mater 47(15):3987CrossRefGoogle Scholar
  10. 10.
    Majimel J, Molenat G, Danoix F, Thuillier O, Blavette D, Lapasset G, Casanove MJ (2004) Philos Mag 84(30):3263CrossRefGoogle Scholar
  11. 11.
    Porter DA, Easterling KE (1992) Phase transformation in metals and alloys. Stanley Thornes (Publishers) Ltd, Cheltenham, p 271CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Lawrence Berkeley National LaboratoryBerkeleyUSA
  2. 2.Case Western Reserve UniversityClevelandUSA

Personalised recommendations