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The indenter tip radius effect in micro- and nanoindentation hardness experiments 被引量:5

The indenter tip radius effect in micro- and nanoindentation hardness experiments
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摘要 Nix and Gao established an important relation between the microindentation hardness and indentation depth. Such a relation has been verified by many microindentation experiments (indentation depths in the micrometer range), but it does not always hold in nanoindentation experiments (indentation depths approaching the nanometer range). Indenter tip radius effect has been proposed by Qu et al. and others as possibly the main factor that causes the deviation from Nix and Gao's relationship. We have developed an indentation model for micro- and nanoindentation, which accounts for two indenter shapes, a sharp, conical indenter and a conical indenter with a spherical tip. The analysis is based on the conventional theory of mechanism-based strain gradient plasticity established from the Taylor dislocation model to account for the effect of geometrically necessary dislocations. The comparison between numerical result and Feng and Nix's experimental data shows that the indenter tip radius effect indeed causes the deviation from Nix-Gao relation, but it seems not be the main factor. Nix and Gao established an important relation between the microindentation hardness and indentation depth. Such a relation has been verified by many microindentation experiments (indentation depths in the micrometer range), but it does not always hold in nanoindentation experiments (indentation depths approaching the nanometer range). Indenter tip radius effect has been proposed by Qu et al. and others as possibly the main factor that causes the deviation from Nix and Gao's relationship. We have developed an indentation model for micro- and nanoindentation, which accounts for two indenter shapes, a sharp, conical indenter and a conical indenter with a spherical tip. The analysis is based on the conventional theory of mechanism-based strain gradient plasticity established from the Taylor dislocation model to account for the effect of geometrically necessary dislocations. The comparison between numerical result and Feng and Nix's experimental data shows that the indenter tip radius effect indeed causes the deviation from Nix-Gao relation, but it seems not be the main factor.
出处 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2006年第1期1-8,共8页 力学学报(英文版)
基金 The project supported by the National Natural Science Foundation of China (10121202) the Ministry of Education of China (20020003023)
关键词 Taylor dislocation model Strain gradient plasticity Indentation Nix-Gao relation Taylor dislocation model Strain gradient plasticity Indentation Nix-Gao relation
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  • 1Nix W.D.: Mechanical properties of thin films. Mater. Trans. 20A:2217-2245 (1989).
  • 2de Guzman M.S., Neubauer G., Flinn EA., Nix W.D.: The role of indentation depth on the measured hardness of materials. Mater Res Symp Proc 308:613-618 (1993).
  • 3Stelmashenko N.A., Walls M.G., Brown L.M., Milman Y.V.: Microindentations on W and Mo oriented single crystals - an SEM study. Acta Metall Mater 41:2855-2865 (1993).
  • 4Ma Q., Clarke D.R.: Size-dependent hardness of silver single crystals. J. Mater Res. 10:853-863 (1995).
  • 5Poole W.J., Ashby M.F., Fleck N.A.: Micro-hardness of annealed and work-hardened copper polycrystals. Scripta Mater 34: 559-564 (1996)
  • 6McElhaney K.W., Vlassak J.J., Nix W.D.: Determination of indenter tip geometry and indentation contact area for depth-sensing indentation experiments. J. Mater Res. 13:1300-1306 (1998).
  • 7Saha R., Xue Z., Huang Y., Nix W.D.: Indentation of a soft metal film on a hard substrate: strain gradient hardening effects. J. Mech.Phys. Solids 49:1997-2014 (2001).
  • 8Swadener J.G., George E.E, Pharr G.M.: The correlation of the indentation size effect measured with indenters of various shapes.J. Mech. Phys. Solids 50:681-694 (2002).
  • 9Fleck N.A., Muller G.M., Ashby M.F., Hutchinson J.W.: Strain gradient plasticity-theory and experiment. Acta Metall Mater 42:475-487 (1994).
  • 10Lloyd D.J.: Particle reinforced aluminum and magnesium matrix composites. Int. Mater. Rev. 39:1-23 (1994).

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