Characterization of Indentation Size Effect of Hardness Using a Loading Curve from Crystalline Materials

Y.L. Chiu; W. George Ferguson

doi:10.4028/www.scientific.net/AMR.29-30.55

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 29-30Characterization of Indentation Size Effect of...

Characterization of Indentation Size Effect of Hardness Using a Loading Curve from Crystalline Materials

Abstract:

Nanoindentation technique has been widely used for measuring mechanical properties from a very small volume of material. The hardness measured using the depth sensing nanoindentation technique often decreases with increasing indentation size, the so called indentation size effect (ISE)[1, 2]. It has been generally acknowledged that the ISE in crystalline materials originates from the density change of geometrically necessary dislocations (GND) needed to accommodate a permanent indentation imprint. Conventionally, to characterize an ISE often requires a series measurement of hardness values at different indentation size. Based on the celebrated Oliver-Pharr scheme[3]. We propose a method to derive the ISE from the loading curve of one single indentation test. The application and limitation of the proposed method will be discussed.

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Periodical:

Advanced Materials Research (Volumes 29-30)

Pages:

55-58

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.29-30.55

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Online since:

November 2007

Authors:

Y.L. Chiu, W. George Ferguson

Keywords:

Crystalline Materials, Indentation Size Effect (ISE), Nanoindentation

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