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Scanning Acoustic Microscopic and Brillouin Scattering Investigation of Surface Damage

  • S. Sathish
  • M. Mendik
  • A. Kulik
  • G. Gremaud
  • P. Wachter
Part of the Acoustical Imaging book series (ACIM, volume 20)

Abstract

Mechanical polishing involves progressive removal of material through repeated rubbing against an another material in presence of abrasives. Near the surface large strains are induced. The existence of surface layer that has been strained to different degree than the bulk has been demonstrated by several techniques like X-ray diffraction[1], electron microscopy[1], positron annihilation[2], hydrogen permeation[3] and mechanical measurements[l]. It is expected that the mechanical properties of material near the surface might be different from the bulk interior. It has been shown that this top layer has large influence on stress-strain curves, creep, fatigue and stress corrosion resistance of metals[1]. Although a variety of techniques have been used to investigate the effect of surface layer on the bulk material properties, the properties of the layer itself have not been investigated in detail, except for some micro hardness and flow stress measurements. These techniques measure the plastic properties of the material. The flow stress of the surface layer of single crystal copper[4] has been found to be lower than the bulk, while in aluminum single crystals[5] the opposite behavior has been reported. The micro hardness measurement of the surface layers has shown two distinctive behaviors. A few investigators have shown that the surface hardness is greater than the bulk, while several others have pointed out that it is low near the surface and increases with the depth and goes through a maximum before reaching the bulk hardness. A discussion about the controversies of the near surface mechanical properties can be found in Ref.[6]. Theoretically both behaviors of flow stress and micro hardness have been explained [7,8,9]. The softness of the layer has been explained on the basis of image forces on dislocation, while the hard surface layer is attributed to the increase of dislocation density due to deformation.

Keywords

Elastic Constant Rayleigh Wave Surface Acoustic Wave Hydrogen Permeation Single Crystal Copper 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    I.R.Kramer. Surface layer effects on mechanical behaviour of metals in “Advances in Mechanics and Physics of Surfaces,”. R.M. Latanision and T.E. Fischer. ed,Vol 3, pp109, Hardwood Academic, New.York. (1986)Google Scholar
  2. 2.
    J-L. Lee, J.T. Waber Metall. Trans. 21A : 2037, (1990)Google Scholar
  3. 3.
    J-L. Lee, J.T. Waber and Y.Park, Scripta. Metal. 20 : 823, (1986)CrossRefGoogle Scholar
  4. 4.
    J.T. Fourie. Phil. Mag. 17 : 735, (1965)ADSCrossRefGoogle Scholar
  5. 5.
    1.R. Kramer. Trans. Metall. Soc. AIME. 233 : 1462, (1965)Google Scholar
  6. 6.
    S.Jahanmir, Laminar wear particle formation, in “Advances in Mechanics and Physics of Surfaces”, R.M. Latanision and T.E. Fischer, ed,Vol 3, pp 261, Hardwood Academic, New.York. (1986)Google Scholar
  7. 7.
    F.R.N. Nabarro, “Surface effects in crystal plasticity” NATO Advanced study Series No. 17 (1977)Google Scholar
  8. 8.
    J.P. Hirth and D.A. Rigney. Wear 39 : 133 (1976)CrossRefGoogle Scholar
  9. 9.
    N.P. Shu Wear 25 : 111 (1973)Google Scholar
  10. 10.
    S.Sathish, M. Mendik, A.Kulik, G.Gremaud, P. Wachter.,Appl. Phys. Lettr. 51 : 167 (1991)ADSCrossRefGoogle Scholar
  11. 11.
    M.Mendik, S.Sathish, A.Kulik, G.Gremaud and P. Wachter.J.Appl. Phys. 71, 2830, (1992)ADSCrossRefGoogle Scholar
  12. 12.
    A. Kulik, E. Bideaux, G.Gremaud, S.Sathish. Continuous wave ultrasonics : An old method with new applications. In “ Ultrasonic Signal Processing”, pp 355, A. Alippi, ed, World Scientific, Singapore (1989).Google Scholar
  13. 13.
    A. Kulik, G.Gremaud, S.Sathish Acoustical Imaging Vol 17, pp 71, H.Shimizu, N. Chubachi, J.I. Kushibiki ed, Plenum, New York . (1988)Google Scholar
  14. 14.
    M.W. Elmiger, J.Henz, H.v. Kanel, M.Ospelt and P.Wachter Surfaces. Interface Analysis. 14 : 18, (1989).CrossRefGoogle Scholar
  15. 15.
    G.W. Farnell, Properties of elastic surface waves, in “ Physical Acoustics” Vol VII, W.P. Mason and R.N. Thurston, ed, pp 109, Academic Press, New York, (1970)Google Scholar

Copyright information

© Springer Science+Business Media New York 1993

Authors and Affiliations

  • S. Sathish
    • 1
  • M. Mendik
    • 2
  • A. Kulik
    • 3
  • G. Gremaud
    • 3
  • P. Wachter
    • 2
  1. 1.Analytical Services and Materials Inc.HamptonUSA
  2. 2.Laboratorium fur FestkorperphysikETHZZurichSwitzerland
  3. 3.Institute de Genie Atomique, Departement de PhysiqueEPFLLausanneSwitzerland

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