Hostname: page-component-78c5997874-xbtfd Total loading time: 0 Render date: 2024-11-17T18:01:38.115Z Has data issue: false hasContentIssue false
  • English
  • Français

Nanoindentation Characterisation of Coated Systems: P:S2 - A New Approach Using the Continuous Stiffness Technique

Published online by Cambridge University Press:  10 February 2011

T. F. Page ,
G. M. Pharr ,
J. C. Hay ,
W. C. Oliver ,
B. N. Lucas ,
E. Herbert  and
L. Riester
T. F. Page
Affiliation:
Materials Division, University of Newcastle, Newcastle upon Tyne, NE1 7RU, UK.
G. M. Pharr
Affiliation:
Metals & Ceramics Division, Oak Ridge National Laboratory, Tennessee 37831-6069, USA
J. C. Hay
Affiliation:
Metals & Ceramics Division, Oak Ridge National Laboratory, Tennessee 37831-6069, USA
W. C. Oliver
Affiliation:
Nano Instruments, Inc, Larson Drive, Oak Ridge, Tennessee 37830, USA
B. N. Lucas
Affiliation:
Nano Instruments, Inc, Larson Drive, Oak Ridge, Tennessee 37830, USA
E. Herbert
Affiliation:
Nano Instruments, Inc, Larson Drive, Oak Ridge, Tennessee 37830, USA
L. Riester
Affiliation:
HTML, Oak Ridge National Laboratory, Tennessee 37831-6069, USA
Get access

Abstract

We have begun to explore the use of continuous stiffness techniques for studying the mechanical properties of coated systems using nanoindentation and thus to critically assess the differing types of sample information available from simple load-displacement (P-δ) curves, P-δ2 analyses and P-S2 (i.e. load-vs-(contact stiffness)2) data. We have also examined whether the small superposed AC signal used to continuously measure contact stiffness has had any marked effect on the sample load-displacement response. A range of fully calibrated Nano Indenter II and Nano Indenter XP instruments have been used for data acquisition, while transmission electron microscopy (TEM) and high resolution scanning electron microscopy (HRSEM) have both been employed to characterise the resultant indentation appearances and deformation structures. Samples have spanned a number of monolithic and coated materials systems including fused silica, 6H-SiC, 3C-SiC on Si and TiN on both M2 and 304 steels. Plots of P-δ and P-δ2recorded with and without the additional AC signal were found to be indistinguishable. Further, apart from some small statistical variation in the loads at which crack initiation was observed in a SiC-on-Si coated system, TEM and HRSEM studies showed no detectable differences in deformation substructures between nominally identical indentations made with and without the AC signal.

While the parameter P/S2 is independent of detailed tip shape and is a constant with displacement for monolithic systems, it was found to display unexpected variations with displacement for the coated systems. In order to explore the origins of these variations, we have examined plots of system elastic modulus (Es) and system hardness (Hs) as a function of indenter displacement which have shown that the effective contact elastic modulus decreases more rapidly with increasing contact scale than does the effective system hardness P/S2 can also be related to the plasticity index (ψ) widely used to describe the balance between the elastic and plastic responses of materials subjected to contact damage. Thus, the observations of maxima in plots of P/S2 with displacement, for at least some coated systems, suggests that there may be an optimum contact scale for maximising the elastic contribution to the contact response of such systems

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 522: Symposium T – Fundamentals of Nanoindentation & Nanotribology , 1998 , 53
Copyright
Copyright © Materials Research Society 1998

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

1. Rickerby, D S & Bull, S J, Surf Coat. Tech., 39/40, 1989, 315–328.Google Scholar
2. Page, T F and Hainsworth, S V, Surf Coat. Tech. 61, 1993, 201–208. Google Scholar
3. Page, T F in Solid-SolidInteractions, 1996, (Eds Adams, M.J., Briscoe, B.J. & Biswas, S.K.) (Imperial College Press & World Scientific Pub. Co. UK & USA), pp93–116.Google Scholar
4. Hainsworth, S V, Bartlett, Tand Page, T F, Thin Solid Films, 236, 1993, 214–218.Google Scholar
5. Hainsworth, S V, McGurk, M R & Page, T F, Surf Coat. Tech., 102, 1998, 97–107 Google Scholar
6. McGurk, M R & Page, T F, submitted to J. Mater. Res., (1998)Google Scholar
7. Korsunsky, A M, McGurk, M R, Bull, S J & Page, T F, Surf Coat. Tech., 99, 1998, 171–183.Google Scholar
8. McGurk, M R, Chandler, H W, Twigg, P C & Page, T F, Surf. Coat. Tech., 68/69, 1994, 576–581;Google Scholar
McGurk, M R, Chandler, H W, Twigg, P C & Page, T F, Surf. Coat. Tech., 92, 1997, 87–95 Google Scholar
9. McGurk, M R, & Page, T F,Surf. Coat. Tech., 92, 1997, 87–95 Google Scholar
10. Hainsworth, S V, Chandler, H W, & Page, T F, J. Mater. Res., 11, 1995, 1987–1995.Google Scholar
11. Hainsworth, S Vand Page, T F, Symp. Proc. Mats. Res. Society, 436, 1997, 171–176. Google Scholar
12. Oliver, W C & Pharr, G M, J. Mater. Res., 7, 1992, 1564–1583.Google Scholar
13. Loubet, J-L, Georges, J M & Meille, J in Microindentation Techniques in Materials Science & Engineering, 1986, (Eds Blau, P J & Lawn, B R)(ASTM, Philadelphia), 72–89.Google Scholar
14. Johnson, K L, Contact Mechanics, 1985, p62 (Cambridge University Press, UK)Google Scholar
15. Hainsworth, S V, Bull, S Jand Page, T F, Symp. Proc. Mats. Res. Society, 522, 1998.Google Scholar
16. Bull, S J, and Korsunsky, A M, Tribol. Int., 1998, (in press)Google Scholar
17. Joslin, D L and Oliver, W C, J. Mater. Res., 5, 1990, 123–126.Google Scholar
18. Sneddon, I N, Int. J. Eng. Sci., 3, 1965, 47–57.Google Scholar
19. Ashby, M F, Materials Selection in Mechanical design, 1992, (Pergamon Press).Google Scholar
20. Lucas, B N, Oliver, W C, Pharr, G M, and Loubet, J-L, Symp. Proc. Mats. Res. Society, 436, 1997, 233–238. Google Scholar
21. Page, T.F., Riester, L. & Hainsworth, S. V., Symp. Proc. Mats. Res. Society, 522, 1998.Google Scholar
22. Page, T F, Oliver, W Cand McHargue, C J, J. Mater. Res., 7, 1992, 450–473 Google Scholar
23. Greenwood, J Aand Williamson, J B P, Proc. Roy. Soc. London, A295, 1966, 300–330 Google Scholar
24. Cheng, Y-T & Cheng, C-M, Appl. Phys. Letts., 73, 1998, 614–616. Google Scholar
25. King, R B, Int. J. Solids Structures, 23, 1987, 1657–1664 Google Scholar
26. Stone, D S, Tambwe, M F, Kung, H, & Nastasi, M, Symp. Proc. Mats. Res. Soc., 522, 1998.Google Scholar
27. Hay, J L, Oliver, W C,Bolshakov, A & Pharr, G M, Symp. Proc. Mats. Res. Soc., 522, 1998.Google Scholar
28. Taljat, B, Zacharia, T, and Pharr, G M, Symp. Proc. Mats. Res. Society, 522, 1998.Google Scholar