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The Role of Stacking Fault Energy on the Indentation Size Effect of FCC Pure Metals and Alloys

Published online by Cambridge University Press:  10 February 2012

D.E. Stegall ,
M.A. Mamun  and
A.A. Elmustafa
D.E. Stegall
Affiliation:
Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, VA, 23529, United States
M.A. Mamun
Affiliation:
Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, VA, 23529, United States
A.A. Elmustafa
Affiliation:
Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, VA, 23529, United States
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Abstract

We investigated the effect of stacking fault free energy (SFE), on the magnitude of the indentation size effect (ISE) of several pure FCC metals using nanoindentation. The metals chosen were 99.999% Aluminum, 99.95% Nickel, 99.95% Silver, and 70/30 Copper Zinc (α-brass). Aluminum has a high SFE of about 200 mJ/ m2, whereas α -brass has a low SFE of less than 10 mJ/ m2. Nickel and Silver have intermediate SFE of about 128 mJ/ m2 and 22 mJ/m2 respectively. The SFE is an important interfacial characteristic and plays a significant role in the deformation of FCC metals due to its influence on dislocation movement and morphology. The SFE is a measure of the distance between partial dislocations and has a direct impact on the ability of dislocations to cross slip during plastic deformation. The lower the SFE the larger the separation between partial dislocations and thus cross slip and dynamic recovery are inhibited. The SFE impacts pure metals differently from alloys. It was discovered that the characteristic ISE behavior for the pure metals was different when compared to the α-brass which is an alloy. Several additional alloys were chosen for comparison including 7075 Aluminum and 70/30 Nickel Copper.

Keywords

nano-indentationhardnessdislocations
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1424: Symposium SS – Properties and Processes at the Nanoscale Nanomechanics of Material Behavior , 2012 , mrsf11-1424-ss02-04
Copyright
Copyright © Materials Research Society 2012

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References

REFERENCES

1. Wang, S.L. and Murr, L.E., Effect of prestrain and stacking-fault energy on the application on the Hall-Petch relation in FCC metals and alloys. Metallography, 1980. 13(3): p. 203–24.Google Scholar
2. Caballero, V. and Varma, S.K., Effect of stacking fault energy and strain rate on the microstructural evolution during room temperature tensile testing in Cu and Cu-Al dilute alloys. Journal of Materials Science, 1999. 34 p. 461–8.Google Scholar
3. Elmustafa, A.A. and Stone, D.S., Stacking fault energy and dynamic recovery: Do they impact the indentation size effect? Materials Science and Engineering A, 2003. 358 p. 1–8.Google Scholar
4. Rester, M., Motz, C., and Pippan, R., Stacking fault energy and indentation size effect: Do they interact? Scripta Materialia, 2008. 58 p. 187–190.Google Scholar
5. Elmustafa, A.A. and Stone, D.S., Size-dependent hardness in annealed and work hardened -brass and aluminum polycrystalline materials using activation volume analysis. Materials Letters, 2003. 57: p. 1072–8.Google Scholar
6. Fleck, N.A., et al. ., Strain gradient plasticity: theory and experiment. Acta Metallurgica et Materialia, 1994. 42: p. 475–87.Google Scholar
7. Ma, Q. and Clarke, D.R., Size dependent hardness of silver single crystals. Journal of Materials Research, 1995. 10 p. 853–863.Google Scholar
8. Poole, W.J., Ashby, M.F., and Fleck, N.A., Micro-hardness of annealed and work-hardened copper polycrystals. Scripta Materialia, 1996. 34: p. 559–64.Google Scholar
9. Nabarro, F.R.N., Shrivastava, S., and Luyckx, S.B., The size effect in microindentation. Philosophical Magazine, 2006. 86: p. 4173–4180.Google Scholar
10. Gao, H., et al. ., Mechanism-based strain gradient plasticity - I. Theory. Journal of the Mechanics and Physics of Solids, 1999. 47: p. 1239–1263.Google Scholar
11. Nix, W.D., Gao, H., Indentation Size Effects in crysatlline materials: A law for strain gradient plasticity. Journal of the Mechanics and Physics of Solids, 1998. 46: p. 411–425.Google Scholar
12. Elmustafa, A.A., Ananda, A.A., and Elmahboub, W.M., Bilinear behavior in nano and microindentation tests of fcc polycrystalline materials. Journal of Engineering Materials and Technology, Transactions of the ASME, 2004. 126 p. 353–359.Google Scholar
13. Pharr, G.M., Strader, J.H., and Oliver, W.C., Critical issues in making small-depth mechanical property measurements by nanoindentation with continuous stiffness measurement. Journal of Materials Research, 2009. 24: p. 653–66.Google Scholar
14. Murr, L.E., Interfacial Phenomena in Metals and Alloys. 1 ed. 1975, Reading, Massachusettes: Addison-Welsley Publishing Company, Inc. 376.Google Scholar
15. Delehouzee, L. and Deruyttere, A., The stacking fault density in solid solutions based on copper, silver, nickel, aluminium and lead. Acta Metallurgica, 1967. 15(5): p. 727–734.Google Scholar
16. Liu, Y.C. and Gallagher, P.C.J., Analytical expressions for the composition dependence of stacking fault energies and probabilities in binary silver systems. Journal of Applied Physics, 1971. 42(9): p. 3322–8.Google Scholar