Strain-rate jump tests in compression are carried out on nanostructured copper (grain size = 90 nm) at moderate temperatures (353K - 393K). Strain-rate sensitivity m is measured as a function of temperature, T, and strain rate, έ. Increasing temperature or decreasing strain rate induces an increase in the strain-rate sensitivity. For (έ, T) = (1×10-5 s-1, 393K), m is equal to 0.17 which is the highest value reported for nanocrystalline copper. These results of enhanced m are encouraging in terms of gain in ductility. The measurements emphasize the existence of a thermally activated mechanism different from the normal rate-controlling process observed for microcrystalline fcc metals.
This is a preview of subscription content, access via your institution.
Buy single article
Instant access to the full article PDF.
Tax calculation will be finalised during checkout.
C.C. Koch and T.R. Malow, J. Metastable Nanocryst Mater, 2-6, 565, (1999)
H.S. Kim and Y. Estrin, Appl Phys Lett, 79, 4115, (2001)
E.W. Hart, Acta Metall, 15, 351, (1967)
Y. Champion, C. Langlois, S. Guérin-Mailly, P. Langlois, J.L. Bonnentien, M.J. Hÿtch, Science, 300, (2003)
C. Langlois, M.J. Hÿtch, C. Leroux, S. Guérin, P. Langlois, Y. Champion, submitted to Scr Mater
Y. Champion, J. Bigot, Mater Sci Eng A 217/218, 58, (1996)
C. Langlois, M.J. Hÿtch, P. Langlois, S. Lartigue-Korinek, Y. Champion, submitted to Metall. Trans.
Y.M. Wang and E. Ma, Appl Phys Lett, 85, 1, (2004)
Y.M. Wang and E. Ma, Appl Phys Lett, 83, 3165, (2003)
Y.J. Li, X.H. Zeng, W. Blum, Acta Mater, 52, 5009, (2004)
J. Pilling and N. Ridley, Superplasticity in crystalline solids, The Institute of Metals (The Camelot Press. 1989) p. 6
Q. Wei, S. Cheng, K.T. Ramesh, E. Ma, Mater Sci Eng A381, 71, (2004)
F.H. Dalla Torre, E.V. Pereloma, C.H. Davies, Scr Mater, 51, 367, (2004)
Y.M. Wang and E. Ma, Acta Mater, 52(6), 1699, (2004)
S. Cheng, E. Ma, Y.M. Wang, L.J. Kecskes, K.M. Youssef, C.C. Koch, U.P. Trociewitz, K. Han, Acta Mater, 53, 1521, (2005)
L. Lu, R. Schwaiger, Z.W. Shan, M. Dao, K. Lu, S. Suresh, Acta Mater, in press, (2005)
D.A. Woodford, Trans ASM, 62, 291, (1969)
Y. Champion, C. Langlois, S. Guérin, S. Lartigue-Korinek, P. Langlois and M.J. Hÿtch, Mater Sc For, 482, 71, (2005)
G. He, J. Eckert, W. Löser, L. Schultz, Nature Mater., 33, 2, (2003)
About this article
Cite this article
Duhamel, C., Guérin, S., Hÿtch, M. et al. Deformation behavior and strain rate sensitivity of nanostructured materials at moderate temperatures. MRS Online Proceedings Library 880, 83 (2005). https://doi.org/10.1557/PROC-880-BB8.3