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Effects of lattice defects on indentation-induced plasticity initiation behavior in metals

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Abstract

Plasticity initiation behavior that appears as a pop-in phenomenon on a loading process during indentation-induced deformation was investigated to reveal the effects of lattice defects such as grain boundary and solute element for various metallic materials including Fe alloys through instrumented nanoindentation techniques. The critical load Pc of pop-in on a loading process is lower in the vicinity of the grain boundary than in the grain interior, but the relative hardness of the boundary is equal to or greater than that in grain interior. In-solution Si produces a larger increase in the Pc for both the grain boundary and the grain interior in the Fe–Si alloy than in the interstitial-free steel. The maximum shear stress corresponding to the Pc underneath the indenter is directly proportional to the shear modulus in single crystals with various crystallographic structures. Microstructural effects on the Pc are considered based on some dislocation models.

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Acknowledgments

The authors would like to thank Prof. Nakashima in Kyusyu University for providing the Fe–Si alloy sample. This work is partially supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Scientific Research (C) No. 23560852 (2011).

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Authors and Affiliations

  1. Structural Materials Unit, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0047, Japan

    T. Ohmura & L. Zhang

  2. Department of Materials Science and Engineering, University of Tsukuba, Tsukuba, Ibaraki, Japan

    K. Sekido

  3. Structural Materials Unit, National Institute for Materials Science, Tsukuba, Ibaraki, 305-0047, Japan

    K. Tsuzaki

  4. University of Tsukuba, Tsukuba, Ibaraki, Japan

    K. Tsuzaki

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  1. T. Ohmura
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  2. L. Zhang
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  4. K. Tsuzaki
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Correspondence to T. Ohmura.

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Ohmura, T., Zhang, L., Sekido, K. et al. Effects of lattice defects on indentation-induced plasticity initiation behavior in metals. Journal of Materials Research 27, 1742–1749 (2012). https://doi.org/10.1557/jmr.2012.161

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  • DOI: https://doi.org/10.1557/jmr.2012.161

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