Abstract
The initiation of plasticity and the subsequent state in the vicinity of a single grain boundary during indentation-induced deformation were investigated to understand an elementary step of a stress-strain behavior of polycrystalline materials. Nanoindentation measurements on several points on a single grain boundary and the grain interior of an interstitial-free steel and an analysis on the pop-in behavior and the plastic nanohardness were carried out. The pop-in load P c that was obtained on the loading curve is different for each measurement. However, the loading curves overlap one another and the unloading curves coincide as well after the pop-in event. The nanohardness Hn has no dependence on the P c in the range of 150–550 μN. The relation between P c and Δh can be expressed as a simple cubic polynomial function based on a geometrically necessary dislocation loop model. The fitted function differed for various grains with different crystallographic orientations.
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References
Hall EO (1951) Proc R Soc B 64:747
Petch NJ (1953) J Iron Steel Inst 174:25
Li JCM (1963) Trans AIME 227:239
Ashby MF (1970) Phil Mag 21:399
Hauser JJ, Chalmers B (1961) Acta Matell 9:802
Carrington WE, McLean D (1965) Acta Matell 13:493
Shen Z, Wagoner RH, Clark WAT (1988) Acta Metall 36:3231
Kurzydlowski KJ, Varin RA, Zielinski W (1984) Acta Metall 32:71
Lee TC, Robertson IM, Birnbaum HK (1990) Met Trans 21A:2437
Wang MG, Ngan AHW (2004) J Mater Res 19:2478
Ohmura T, Minor AM, Stach EA, Morris JW Jr (2004) J Mater Res 19:3626
Ohmura T, Tsuzaki K, Yin F (2005) Mater Trans 46:2026
Oliver WC, Pharr GM (1992) J Mater Res 7:1564
Johnson KL (1985) Contact mechanics. Cambridge University Press, Cambridge, UK, pp. 84–106
Shibutani Y, Koyama A (2004) J Mater Res 19:183
Nix WD, Gao H (1998) J Mech Phys Solids 46:411
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Ohmura, T., Tsuzaki, K. Plasticity initiation and subsequent deformation behavior in the vicinity of single grain boundary investigated through nanoindentation technique. J Mater Sci 42, 1728–1732 (2007). https://doi.org/10.1007/s10853-006-0885-y
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DOI: https://doi.org/10.1007/s10853-006-0885-y