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Measurement of the evolution of internal strain and load partitioning in magnesium hybrid composites under compression load using in-situ synchrotron X-ray diffraction analysis

Meixner, M.; Fitzpatrick, M. E and Reimers, W. (2011). Measurement of the evolution of internal strain and load partitioning in magnesium hybrid composites under compression load using in-situ synchrotron X-ray diffraction analysis. Composites Science and Technology, 71(2) pp. 167–176.

DOI (Digital Object Identifier) Link: https://doi.org/10.1016/j.compscitech.2010.11.003
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Abstract

Energy dispersive synchrotron X-ray diffraction analysis has been applied to evaluate the evolution of average internal elastic lattice strains under compression load within the phases of magnesium hybrid composites, reinforced by silicon-carbide particles and Saffil® alumina short fibres. This allows for the calculation of phase stresses and thus the load partitioning. The mean elastic misfit stresses were calculated using an Eshelby type modelling. Considering the external load, prediction of the phase-specific stresses for elastic composite deformation was performed and the results were compared to the experimental data obtained.

Matrix elastic lattice strains reveal high plastic anisotropy due to the activation of different deformation modes in the form of crystallographic slip and mechanical twinning. The formation of twins, verified by diffraction intensity shifts due to crystallographic reorientation, was found to affect the sharing of load between the participating phases. Consequently different regimes of composite deformation were specified. This comprises elastic regions characterized by linear strain and stress growth for all phases as well as plastic regions showing nonlinear distributions.

Item Type: Journal Item
Copyright Holders: 2010 Elsevier
ISSN: 0266-3538
Keywords: A. Metal matrix composites (MMCs); A. Hybrid composites; C. Modelling; D. X-ray diffraction (XRD); Internal strains
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 25551
Depositing User: Michael E. Fitzpatrick
Date Deposited: 19 Dec 2010 13:37
Last Modified: 02 Nov 2017 15:06
URI: http://oro.open.ac.uk/id/eprint/25551
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