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Anomalous size effect in thermal residual stresses in pressure sintered alumina-chromium composites

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dc.abstract.enThis paper explores an anomalous size effect in thermal residual stresses occurring in the alumina matrix of Al2O3/Cr sintered composite upon varying the particle size of the chromium reinforcement. When a coarse chromium powder (45 µm mean particle size) is used the average residual stress in the alumina phase after cooling is compressive in accordance with the classical Eshelby solution. However, in the case of a fine chromium (5 µm mean particle size) it switches to tension. This effect, detected by photoluminescence piezospectroscopy, is also confirmed by X-ray and neutron diffraction experiments. As the classical micromechanics models are incapable to capture it, a finite element model is developed with the actual composite microstructure being reconstructed from the microtomography images. It is shown by numerical simulations that the anomalous size effect is associated with the complex microstructure of the composite fabricated with the fine chromium powder. It is also pointed out that the temperature dependence of the coefficients of thermal expansion of the matrix and the reinforcement affects the residual stress levels.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorBasista, Michał
dc.contributor.authorWęglewski, Witold
dc.contributor.authorKrajewski, Marcin
dc.contributor.authorBochenek, Kamil
dc.contributor.authorDenis, Piotr
dc.contributor.authorWysmołek, Andrzej
dc.date.accessioned2024-01-24T16:39:56Z
dc.date.available2024-01-24T16:39:56Z
dc.date.issued2019
dc.description.financeNie dotyczy
dc.description.number138111
dc.description.volume762
dc.identifier.doi10.1016/J.MSEA.2019.138111
dc.identifier.issn0921-5093
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/100756
dc.identifier.weblinkhttp://dx.doi.org/10.1016/j.msea.2019.138111
dc.languageeng
dc.pbn.affiliationphysical sciences
dc.relation.ispartofMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
dc.relation.pages1-10
dc.rightsClosedAccess
dc.sciencecloudnosend
dc.subject.enthermal residual stress
dc.subject.enmetal-ceramic composites
dc.subject.ensize effect
dc.subject.enmicrocomputed tomography
dc.subject.enfinite element analysis
dc.titleAnomalous size effect in thermal residual stresses in pressure sintered alumina-chromium composites
dc.typeJournalArticle
dspace.entity.typePublication