Hostname: page-component-78c5997874-s2hrs Total loading time: 0 Render date: 2024-11-05T08:29:10.808Z Has data issue: false hasContentIssue false

Strain Rate Sensitivity of a Nanocrystalline Cu–Ni–P Alloy

Published online by Cambridge University Press:  03 March 2011

J. Chen
Affiliation:
Shenyang National Laboratory for Materials Science (SYNL), Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Y.N. Shi
Affiliation:
Shenyang National Laboratory for Materials Science (SYNL), Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
K. Lu
Affiliation:
Shenyang National Laboratory for Materials Science (SYNL), Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China
Get access

Abstract

Nanoindentation technique was used to measure the strain rate sensitivity (m) of a nanocrystalline Cu-Ni-P alloy prepared by means of electrodeposition. The m value decreases from 0.034 to 0.018 when the nominal grain size increases from 7 nm to 33 nm. Both m values of the alloy are obviously lower than those of the pure Cu with similar grain size, implying that P segregation at grain boundaries might play a key role in retarding grain boundary activities as compared to pure Cu samples.

Type
Articles
Copyright
Copyright © Materials Research Society 2005

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1Van Swygenhoven, H., Spaczer, M. and Caro, A.: Microscopic description of plasticity in computer generated metallic nanophase samples: a comparison between Cu and Ni. Acta Mater. 47, 3117 (1999).CrossRefGoogle Scholar
2Schiøtz, J. and Jacobsen, K.W.: A maximum in the strength of nanocrystalline Cu. Science 301, 1357 (2003).CrossRefGoogle Scholar
3Conrad, H.: Grain-size dependence of the flow stress of Cu from millimeters to nanometers. Metall. Mater. Trans. A 35, 2681 (2004).CrossRefGoogle Scholar
4Conrad, H. and Narayan, J.: Mechanism for grain size softening in nanocrystalline Zn. Appl. Phy. Lett. 81, 2241 (2002).CrossRefGoogle Scholar
5Conrad, H. in High Strength Materials , edited by Zackey, V.F. (John Wiley & Sons, New York, 1965).Google Scholar
6Wei, Q., Cheng, S., Ramesh, K.T. and Ma, E.: 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).CrossRefGoogle Scholar
7Hibbard, R.P. Carreker Jr.and W.R. Jr.: Tensile deformation of high-purity Cu as a function of temperature, strain rate, and grain size. Acta Mater 1, 654 (1953).Google Scholar
8Chen, J., Lu, L. and Lu, K. Hardness and strain rate sensitivity of Cu over a wide grain size range. (2005, unpublished).Google Scholar
9Lüthy, H., White, R.A. and Sherby, O.D.: Grain boundary sliding and deformation mechanism maps. Mater. Sci. Eng. A 39, 211 (1979).CrossRefGoogle Scholar
10Coble, R.L.: A model for boundary diffusion controlled creep in polycrystalline materials. J. Appl. Phys. 34, 1679 (1963).CrossRefGoogle Scholar
11Lucas, B.N. and Oliver, W.C.: Indentation power-law creep of high-purity indium. Metall. Mater. Trans. A 30, 601 (1999).CrossRefGoogle Scholar
12Oliver, W.C. and Pharr, G.M.: An improved technique for determining hardness and elastic-modulus using load and displacement sensing indentation experiments. J. Mater. Res. 7, 1564 (1992).CrossRefGoogle Scholar
13Lu, L., Li, S.X. and Lu, K.: An abnormal strain rate effect on tensile behavior in nanocrystalline Cu. Scripta Mater. 45, 1163 (2001).CrossRefGoogle Scholar
14Elmustafa, A.A., Tambwe, M.F. and Stone, D.S.Activation volume analysis of plastic deformation in fcc materials using nanoindentation, in Surface Engineering 2002–Synthesis, Characterization and Applications , edited by Kumar, A., Meng, W.J., Cheng, Y-T., Zabinski, J.S., Doll, G.L., and Veprek, S. (Mater. Res. Soc. Symp. Proc., 750, Warrendale, PA, 2003), p. Y8.14.1.Google Scholar
15III, G.T. Gray, Lowe, T.C., Cady, C.M., Valiev, R.Z. and Aleksandrov, I.V.: Influence of strain rate & temperature on the mechanical response of ultrafine-grained Cu, Ni, and Al-4Cu-0.5Zr. Nanostruct Mater 9, 477 (1997).Google Scholar
16Wang, Y.M. and Ma, E.: Temperature and strain rate effects on the strength and ductility of nanostructured Cu. Appl. Phys. Lett. 83, 3165 (2003).CrossRefGoogle Scholar
17Follansbee, P.S. and Kocks, U.F.: A constitutive description of the deformation of Cu based on the use of the mechanical threshold stress as an internal state variable. Acta Mater 36, 81 (1988).CrossRefGoogle Scholar
18Zehetbauer, M. and Seumer, V.: Cold work hardening in stages IV and V of F.C.C. metals—I. Experiments and interpretation. Acta Metall Mater. 41, 577 (1993).CrossRefGoogle Scholar
19Bochniak, W.: Mode of deformation and the Cottrell-Strokes law in F.C.C. single crystals. Acta Metall Mater 43, 225 (1995).Google Scholar
20Conrad, H.: Grain size dependence of the plastic deformation kinetics in Cu. Mater. Sci. Eng. A 341, 216 (2003).CrossRefGoogle Scholar
21Perevezentsev, V.N., Rybin, V.V. and Chuvil’deev, V.N.: The theory of structural superplasticity—II. Accumulation of defects on the intergranular and interphase boundaries. Accomodation of the grain-boundary sliding. The upper bound of the superplastic strain rate. Acta Metall Mater. 40, 895 (1992).CrossRefGoogle Scholar
22Conrad, H. and Narayan, J.: On the grain size softening in nanocrystalline materials. Scripta Mater. 42, 1025 (2000).CrossRefGoogle Scholar
23Van Swygenhoven, H. and Caro, A.: Plastic behavior of nanophase metals studied by molecular dynamics. Phys. Rev. B 58, 11246 (1998).CrossRefGoogle Scholar
24Färber, B., Cadel, E., Menand, A., Schmitz, G. and Kirchheim, R.: Phosphorus segregation in nanocrystalline Ni–3.6 at.% P alloy investigated with the tomographic atom probe (TAP). Acta Mater. 48, 789 (2000).CrossRefGoogle Scholar