Title: Local mechanical properties of materials based on matrix-particles system

Authors: Ladislav Pesek, Pavol Zubko, Michal Besterci

Addresses: Department of Materials Science, Faculty of Metallurgy, Technical University of Kosice, Letna 9, SK-042 00 Kosice, Slovakia. ' Department of Materials Science, Faculty of Metallurgy, Technical University of Kosice, Letna 9, SK-042 00 Kosice, Slovakia. ' Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, SK-043 53 Kosice, Slovakia

Abstract: In this study, the local mechanical properties: indentation modulus E_IT and indentation hardness H_IT were experimentally investigated on two matrix-particle systems using depth-sensing indentation technique with a sharp Vickers and Berkovich indenter. The continuous stiffness measurement (CSM) technique was used to obtain the depth profiles of both measured values, which allowed separation of some effects that could affect the results. The investigated materials were interstitial free steel sheet and an Al-Al₄C₃ alloy prepared by mechanical alloying. Indentation curves obtained on individual particles were analysed in detail with respect to particle fracturing and/or penetrating of the particle into the matrix as a secondary indenter. Due to sample preparation the measured hardness can be affected up to 2.5 times, while the modulus value remains unaffected. The H_IT and E_IT values as well the deformation work for matrix and for the particles are included in the article.

Keywords: depth sensing indentation; DSI; interstitial-free steel; Al-Al4C3 alloy; matrix-particle systems; indentation modulus; indentation hardness; continuous stiffness measurement; depth profiles; aluminium alloys; deformation.

DOI: 10.1504/IJMPT.2011.039933

International Journal of Materials and Product Technology, 2011 Vol.40 No.3/4, pp.226 - 249

Published online: 28 Feb 2015 *

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