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

Published online by Cambridge University Press:  30 May 2012

T. Ohmura ,
L. Zhang ,
K. Sekido  and
K. Tsuzaki
T. Ohmura*
Affiliation:
Structural Materials Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
L. Zhang
Affiliation:
Structural Materials Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan
K. Sekido
Affiliation:
Department of Materials Science and Engineering, University of Tsukuba, Tsukuba, Ibaraki, Japan
K. Tsuzaki
Affiliation:
Structural Materials Unit, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan; and University of Tsukuba, Tsukuba, Ibaraki, Japan
*
a)Address all correspondence to this author. e-mail: ohmura.takahito@nims.go.jp
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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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Articles
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Journal of Materials Research , Volume 27 , Issue 13 , 14 July 2012 , pp. 1742 - 1749
Copyright
Copyright © Materials Research Society 2012

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References

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