Abstract
Under conditions typical of Harper-Dorn (H-D) creep the statistical slip-length may become comparable to, or even exceed, the specimen diameter (a size effect). It is demonstrated that a consequence of such a size effect is that the rates of dislocation storage and dynamic recovery are reduced and the static recovery rate will exceed the dynamic one. Under such conditions, the analysis shows that the creep rate will scale linearly with the applied stress, a characteristic of H-D creep.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
J. Harper and J.E. Dorn: Acta Metall., 1957, vol. 5, p. 654.
J. Cadec: Creep in Metallic Materials, Elsevier, Amsterdam, 1988.
H. Oikawa and T.G. Langdon: in Creep Behavior of Crystralline Solids, B. Wishire and R.W. Evans, eds., Pineridge Press, Swansea, 1985, pp. 33–82.
F.A. Mohamed and J. Wolfenstine: in Creep Deformation of Aluminum Alloys, T.G. Langdon, H.P. Merchant, J.D. Morris, and M.A. Zaidi, eds., TMS, Warrendale, PA, 1991, pp. 223–37.
F.A. Mohamed: Metall. Mater. Trans. A, 2002, vol. 33A, pp. 261–78.
W. Blum and W. Maier: Phys. Status Solidi (a), 1999, vol. 171, pp. 467–74.
W. Blum, P. Eisenlohr, and F. Breutinger: Metall. Mater. Trans. A, 2002, vol. 33A, pp. 291–303.
T.J. Ginter, P.K. Chaudhury, and F.A. Mohamed: Acta Mater., 2001, vol. 49, pp. 263–272.
A.J. Ardell and S.S. Lee: Acta Metall., 1986, vol. 34, pp. 2411–23.
A.J. Ardell: Acta Mater. 1996, vol. 45, pp. 2971–81.
M.A. Przystupa and A.R. Ardell: in Deformation, and Properties of Structural Materials, E.M. Taleff, C.K. Syn, and D.R. Lesner, eds., TMS, Warrendale, PA, 2000, pp. 157–68.
J.P. Hirth and J. Lothe: Theory of Dislocations, McGraw-Hill, New York, NY, 1968.
E. Nes: Progr. Mater. Sci., 1998, vol. 41, p. 129.
E. Nes, T. Pettersen, and K. Marthinsen: Scripta Mater., 2000, vol. 43, p. 55.
K. Marthinsen and E. Nes: Mater. Sci. Technol., 2001, vol. 17, p. 376.
K. Marthinsen and E. Nes: Mater. Sci. Eng., in press.
U.F. Kocks: J. Eng. Mater. Technol. (ASME-H), 1976, vol. 98, p. 76.
H. Mecking and U.F. Kocks: Acta Metall., 1981, vol. 29, p. 1865.
Y. Estrin: in Unified Constitutive Laws of Plastic Deformation, A.S. Krausz and K. Krausz, eds., Academic Press, New York, NY, 1996, pp. 69–106.
J. Friedel: Dislocations and Mechanical Properties of Crystals, Wiley, New York, NY, 1957.
T.E. Volin, K.H. Lie, and R.W. Balluffi: Acta Metall., 1971, vol. 19, p. 264.
B. Nøst and E. Nes: Acta Metall., 1969, vol. 17, pp. 13–20.
K.R. McKnee, H. Jones, and G.W. Greenwood: Proc. 9th Int. Conf. on Creep and Fracture of Engineering Materials and Structures, J.D. Parker, ed., The Institute of Metals, London, 2001, pp. 185–95.
Author information
Authors and Affiliations
Additional information
This article is based on a presentation made in the workshop entitled “Mechanisms of Elevated Temperature Plasticity and Fracture,” which was held June 27–29, 2001, in San Diego, CA, concurrent with the 2001 Joint Applied Mechanics and Materials Summer Conference. The workshop was sponsored by Basic Energy Sciences of the United States Department of Energy.
Rights and permissions
About this article
Cite this article
Nes, E., Blum, W. & Eisenlohr, P. Harper-dorn creep and specimen size. Metall Mater Trans A 33, 305–310 (2002). https://doi.org/10.1007/s11661-002-0091-8
Issue Date:
DOI: https://doi.org/10.1007/s11661-002-0091-8