Deformation mechanisms of MMCs under indentation
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This paper investigates the deformation mechanisms of MMCs subjected to micro-indentation by a spherical indenter using a three-dimensional finite element modeling. It was found that deformation behavior, hardness and work hardening of MMCs were highly dependant on the location of indentation relative to particles, volume percentage of the particle, and the size ratio of indenter to particle. The hardness of an MMC varied in a complex manner depending on the restriction on the matrix flow by reinforced particles and work hardening of the matrix material. Hardness increased with the increase of volume percentage of reinforced particles and decrease of the size ratio of indenter to particle. Matrix flow due to indentation was highly non-uniform which generated an inhomogeneous strain filed in an MMC. These pose a question that the conventional definition of micro-hardness is not very appropriate for characterizing MMCs.
NOTICE: this is the author’s version of a work that was accepted for publication in Composites Science and Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Composites Science and Technology, Volume 68, Issue 6, May 2008, DOI: 10.1016/j.compscitech.2007.12.008
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Pramanik, Alokesh; Zhang, L.; Arsecularatne, J. A. (2007)Micro-indentation has been widely used to evaluate the mechanical properties of materials. It has also been considered to be an important measure in the study of machinability of difficult-to-machine materials such as ...
Pramanik, Alokesh; Zhang, L.; Arsecularatne, J. (2012)This paper investigates the inhomogeneous behaviour of metal matrix composites subjected to micro-indentation by a spherical indenter, using 3D finite element analysis. This includes the effects on hardness of volume ...
Pramanik, Alokesh; Zhang, L.; Arsecularatne, J. (2008)The presence of hard reinforce particles in two phases materials, such as metal matrix composites (MMCs), introduces additional effects, such as tool–particle interactions, localised plastic deformation of matrix material, ...