Acta Physica Academiae Scientiarum Hungaricae

, Volume 50, Issue 4, pp 403–408 | Cite as

Effect of pre-strain on the steady state creep of Al-5 wt% Mg

  • N. K. Gobran
  • F. M. Mansy
Condensed Matter


Steady state creep in Al-5 wt% Mg was studied at different stresses from 30 to 90 MPa and at temperatures ranging from 563 K to 613 K. For the pre-annealed samples the applied stress sensitivity parameter “n” was found to be stress independent and amounted to 3.9. While, for samples pre-strained by 20% “n” was equal to 3 at low stresses and 6 at high stresses. The activation energy for steady creep was found to be 143 kJ/mole for the annealed specimens. The controlling mechanism was considered to be the diffusion of Mg in Al matrix. For pre-strained samples, however, the activation energy was stress-dependent and varied from 104 kJ/mole to 84 kJ/mole. The predominant process responsible for creep in the cold worked matrix seemed to be cross-slip of dislocations.


Activation Energy Applied Stress Creep Rate Stress Exponent Steady State Creep 
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  1. 1.
    K. Kucharova, I. Saxl andJ. Cadek, Acta Metall.,22, 465, 1974.CrossRefGoogle Scholar
  2. 2.
    K. L. Murty, F. A. Mohamed andJ. E. Dorn, Acta Metall.,20, 1009, 1972.CrossRefGoogle Scholar
  3. 3.
    H. Oikawa, N. Matsuno andS. Karashima, Metal Sci.,9, 209, 1975.CrossRefGoogle Scholar
  4. 4.
    K. Toma, H. Yoshinaga andS. Morozumi, J. Japan Inst. Metals,39, 626, 1975.Google Scholar
  5. 5.
    S. A. Mahmoud, K. H. Georgy, F. M. Mansy andR. Kamel, Phys. Stat. Sol. (a),51, 257, 1979.CrossRefGoogle Scholar
  6. 6.
    F. M. Mansy, Ph. D. Thesis, Faculty of Science, University of Cairo, 1979.Google Scholar
  7. 7.
    H. W. Pollack, Materials Science and Metallurgy, Reston Publishing Co. Inc. 2nd Ed. 1977, p. 246.Google Scholar
  8. 8.
    S. J. Rothman, N. L. Peterson, L. J. Nowicki andL. C. Robinson, Phys. Stat. Sol. (b)63, K29, 1974.CrossRefGoogle Scholar
  9. 9.
    H. Oikawa, K. Sugawara andS. Karashima, Trans JIM,19, 611, 1978.Google Scholar
  10. 10.
    R. E. Smallman, Modern Physical Metallurgy, Butterworth, London, 1962.Google Scholar
  11. 11.
    J. E. Dorn, Tedding Conf. Creep and Fracture, Nat. Phys. Laboratory, 1957, Contract NONR 222 (49), Series 103 No. 3.Google Scholar
  12. 12.
    D. B. Holt, Acta Metall.,7, 446, 1959.CrossRefGoogle Scholar
  13. 13.
    O. D. Sherby andP. M. Bruke, Prog. Mater. Sci.,13, 325, 1968.CrossRefGoogle Scholar
  14. 14.
    J. Weertman, J. Appl. Phys.,28, 1185, 1957.CrossRefADSGoogle Scholar
  15. 15.
    K. H. Georgy, Ph. D. Thesis, Czechoslovak Academy of Science, Institute of Physical Metallurgy, Brno.Google Scholar

Copyright information

© with the authors 1981

Authors and Affiliations

  • N. K. Gobran
    • 1
  • F. M. Mansy
    • 1
  1. 1.Physics Department, Faculty of ScienceUniversity of CairoGizaEgypt

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