Abstract
A fully dense nanocrystalline (nc) Cu with mean grain size of 72 nm and a broad grain size distribution was synthesized by electrodeposition. Uniaxial tensile tests were done at different strain rates and room temperature. A very high strength of 1.04 G was obtained at strain rate of 0.1 s−1. The nearly perfect plasticity with a large strain of close to 20% was displayed at specific low strain rates of 4 × 10−5 to 10−4 s−1. With increasing strain rate, the nearly perfect plasticity disappeared. Strain rate sensitivity and activation volume of the nc Cu were estimated from the flow stress at a fixed strain of 1% and a strain rate change (jump) test. It was deduced from the high strain rate sensitivity exponent of 0.08 and small activation volume of 12b3 that both dislocation and grain boundary activities would take place in this nc Cu, which explained the nearly perfect plasticity observed in the tensile test.
Similar content being viewed by others
References
R.W. Herzberg: Deformation and Fracture Mechanics of Engineering Materials 3rd ed. John Wiley and Sons New York 1989 392
M.K. Youssef, R.O. Scattergood, K.L. Murty, J.A. Horton, C.C. Koch: Ultrahigh strength and high ductility of bulk nanocrystalline copper. Appl. Phys. Lett. 87, 091904 2005
C. Gu, J. Lian, Q. Jiang, Z. Jiang: Ductile-brittle-ductile transition in an electrodeposited 13 nanometer grain sized Ni–8.6 wt% Co alloy. Mater. Sci. Eng., A 459, 75 2007
C.C. Koch: Optimization of strength and ductility in nanocrystalline and ultrafine grained metals. Scr. Mater. 49, 657 2003
E. Ma: Instabilities and ductility of nanocrystalline and ultrafine-grained metals. Scr. Mater. 49, 663 2003
Y.M. Wang, K. Wang, D. Pan, K. Lu, K.J. Hemker, E. Ma: Microsample tensile testing of nanocrystalline copper. Scr. Mater. 48, 1581 2003
Y. Wang, M. Chen, F. Zhou, E. Ma: High tensile ductility in a nanostructured metal. Nature 419, 912 2002
H. Zhang, Z. Jiang, J. Lian, Q. Jiang: Strain rate dependence of tensile ductility in an electrodeposited Cu with ultrafine grain size. Mater. Sci. Eng., A 479, 136 2008
X. Shen, J. Lian, Z. Jiang, Q. Jiang: High strength and high ductility of electrodeposited nanocrystalline Ni with a broad grain size distribution. Mater. Sci. Eng., A 487, 410 2008
Z. Jiang, X. Liu, G. Li, Q. Jiang, J. Lian: Strain rate sensitivity of a nanocrystalline Cu synthesized by electric brush plating. Appl. Phys. Lett. 88, 143115 2006
J. Chen, L. Lu, K. Lu: Hardness and strain rate sensitivity of nanocrystalline Cu. Scr. Mater. 54, 1913 2006
R.K. Guduru, K. Linga Murty, M.K. Youssef, R.O. Scattergood, C.C. Koch: Mechanical behavior of nanocrystalline copper. Mater. Sci. Eng., A 463, 14 2007
M. Dao, L. Lu, R.J. Asaro, J.T.M. De Hosson, E. Ma: Toward a quantitative understanding of mechanical behavior of nanocrystalline metals. Acta Mater. 55, 4041 2007
H.P. Klug, L.E. Alexander: X-ray Diffraction Procedures 2nd ed. Wiley New York 1974 505
H. Wei, G.D. Hibbard, G. Palumbo, U. Erb: The effect of gauge volume on the tensile properties of nanocrystalline electrodeposits. Scr. Mater. 57, 996 2007
F. Dalla Torre, H. Van Swygenhoven, M. Victoria: Nanocrystalline electrodeposited Ni: Microstructure and tensile properties. Acta Mater. 50, 3957 2002
C. Gu, J. Lian, Z. Jiang, Q. Jiang: Enhanced tensile ductility in an electrodeposited nanocrystalline Ni. Scr. Mater. 54, 579 2006
I. Sabirov, Y. Estrin, M.R. Barnett, I. Timokhina, P.D. Hodgson: Enhanced tensile ductility of an ultra-fine-grained aluminum alloy. Scr. Mater. 58, 163 2008
S. Cheng, E. Ma, Y.M. Wang, L.J. Kecskes, K.M. Youssef, C.C. Koch, U.P. Trociewitz, K. Han: Tensile properties of in situ consolidated nanocrystalline Cu. Acta Mater. 53, 1521 2005
R.J. Asaro, S. Suresh: Mechanistic models for the activation volume and rate sensitivity in metals with nanocrystalline grains and nano-scale twins. Acta Mater. 53, 3369 2005
L. Lu, R. Schwarger, Z.W. Shan, M. Dao, K. Lu, S. Suresh: Nano-sized twins induce high rate sensitivity of flow stress in pure copper. Acta Mater. 53, 2169 2005
Q. Wei, S. Cheng, K.T. Ramesh, E. Ma: Effect of nanocrystalline and ultrafine grain sizes on the strain rate sensitivity and activation volume: fcc versus bcc metals. Mater. Sci. Eng., A 381, 71 2004
J. Lian, C. Gu, Q. Jing, Z. Jiang: Strain rate sensitivity of face-centered-cubic nanocrystalline materials based on dislocation deformation. J. Appl. Phys. 99, 076103 2006
E. Ma: Eight routes to improve the tensile ductility of bulk nanostructured metals and alloys. JOM 58, 49 2006
Y.M. Wang, A.V. Hamza, E. Ma: Temperature-dependent strain rate sensitivity and activation volume of nanocrystalline Ni. Acta Mater. 54, 2715 2006
Y.M. Wang, E. Ma: Temperature and strain rate effects on the strength and ductility of nanostructured copper. Appl. Phys. Lett. 83, 3165 2003
Y.M. Wang, E. Ma: Three strategies to achieve uniform tensile deformation in a nanostructured metal. Acta Mater. 52, 1699 2004
H. Li, F. Ebrahimi: Ductile-to-brittle transition in nanocrystalline metals. Adv. Mater. 17, 1969 2005
H. Li, F. Ebrahimi: Tensile behavior of a nanocrystalline Ni-Fe alloy. Acta Mater. 54, 2877 2006
C.D. Gu, J.S. Lian, Q. Jiang, W.T. Zheng: Experimental and modeling investigations on strain rate sensitivity of an electrodeposited 20 nm grain sized Ni. J. Phys. D: Appl. Phys. 40, 7440 2007
K.S. Kumar, S. Suresh, M.F. Chisholm, J.A. Horton, P. Wang: Deformation of electrodeposited nanocrystalline nickel. Acta Mater. 51, 387 2003
E. Ma, Y.M. Wang, Q.H. Lu, M.L. Sui, L. Lu, K. Lu: Strain hardening and large tensile elongation in ultrahigh-strength nano-twinned copper. Appl. Phys. Lett. 85, 4932 2004
Y. Chanmpaion, C. Langlois, S. Guérin-Mailly, P. Langlois, J-L. Bonnentien, M.J. Hÿtch: Near-perfect elastoplasticity in pure nanocrystalline copper. Science 300, 310 2003
Y.M. Wang, E. Ma: On the origin of ultrahigh cryogenic strength of nanocrystalline metals. Appl. Phys. Lett. 85, 2750 2004
C. Brandl, E. Bitzek, P.M. Derlet, H. Van Swygenhoven: Slip transfer through a general high angle grain boundary in nanocrystalline aluminum. Appl. Phys. Lett. 91, 111914 2007
I.A. Ovid’ko: Review on the fracture processes in nanocrystalline materials. J. Mater. Sci. 42, 1694 2007
Acknowledgments
This work was supported by the Foundation of National Key Basic Research and Development Program (No. 2004CB619301), the National Natural Science Foundation of China (No. 50771049), and Project 985-automotive engineering of Jilin University.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Wang, G., Jiang, Z., Zhang, H. et al. Enhanced tensile ductility in an electrodeposited nanocrystalline copper. Journal of Materials Research 23, 2238–2244 (2008). https://doi.org/10.1557/JMR.2008.0280
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1557/JMR.2008.0280