Damage and loading rate effects on the microfailure behaviour of Al 2O3-ceramics studied by SEM

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dc.contributor.author Kytopoulos, VN en
dc.contributor.author Papadopoulos, GA en
dc.contributor.author Sadowski, T en
dc.date.accessioned 2014-03-01T01:23:47Z
dc.date.available 2014-03-01T01:23:47Z
dc.date.issued 2006 en
dc.identifier.issn 0022-2461 en
dc.identifier.uri http://hdl.handle.net/123456789/17135
dc.subject Electron Probe Microanalysis en
dc.subject Energy Dissipation en
dc.subject Energy Requirement en
dc.subject Scanning Electron Microscopy en
dc.subject X Rays en
dc.subject.classification Materials Science, Multidisciplinary en
dc.subject.other Alumina en
dc.subject.other Computer simulation en
dc.subject.other Failure analysis en
dc.subject.other Microcracking en
dc.subject.other Scanning electron microscopy en
dc.subject.other Surface roughness en
dc.subject.other X ray analysis en
dc.subject.other Fractographic roughness en
dc.subject.other Fractographical images en
dc.subject.other Microfractographic features en
dc.subject.other Ceramic materials en
dc.title Damage and loading rate effects on the microfailure behaviour of Al 2O3-ceramics studied by SEM en
heal.type journalArticle en
heal.identifier.primary 10.1007/s10853-006-3638-z en
heal.identifier.secondary http://dx.doi.org/10.1007/s10853-006-3638-z en
heal.language English en
heal.publicationDate 2006 en
heal.abstract A scanning electron microscopy (SEM)-X-ray combined experimental approach to qualitative and semi-quantitative characterization of microfailure behaviour of an Al2O3-ceramic material in terms of induced damage is presented. The qualitative approach was based on representative fractographical images and data obtained by SEM whereas the semi-quantitative approach was based on a new technique of the X-ray electron probe microanalysis (X-ray EPMA) capable to detect the localized subsurface damage. The damage was induced by a simple rotary notch-cutting procedure where the associated damage parameters can be controlled by the cutting rate. By correlating certain characteristic macro- and microfractographic features/patterns with well-known microfailure mechanisms it was possible to make qualitatively, in an indirect way, evident the existence of induced damage which was assumed to be ideal brittle having only microcracking component. In the same correlating way the stimulating effect of internal pores on the damage development was deduced. Observed loading rate effects on the fractographic behaviour expressed by changes in fracture roughness and micromorphology were attributed to pore-assisted microcracking linkage. Low porosity under high loading rates tends to lower the fractographic roughness, a fact which can be related with a reduction in the ability of energy dissipation. On the other hand, high porosity under increasing loading rates leads to non observable changes in the fractographic roughness, a fact which is indicative of corresponding no appreciable changes in the dissipative character of the material. The measured local damage distribution ahead of the notch-tip shows a monotonic increasing of damaging effects toward the tip. By means of this distribution the total or average damage degree and process zone length ahead of the notch-tip were evaluated. The increase of these two damage parameters is not proportional to the increase in the cutting speed i.e. the rate of damage development. Finally, by assuming brittle damage an experimental approaching procedure for the estimation of the induced energy required for the microcracking damage was proposed. (c) 2006 Springer Science + Business Media, Inc. en
heal.publisher SPRINGER en
heal.journalName Journal of Materials Science en
dc.identifier.doi 10.1007/s10853-006-3638-z en
dc.identifier.isi ISI:000236968200033 en
dc.identifier.volume 41 en
dc.identifier.issue 7 en
dc.identifier.spage 2121 en
dc.identifier.epage 2131 en

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