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Ductile-brittle transition in micropillar compression of GaAs at room temperature
Laboratory for Mechanics of Materials and Nanostructures, EMPA, Swiss Federal Laboratories for Material testing and Research, Thun, Schweiz.
Gordon Laboratory, Dept of Materials Science and Metallurgy, Cambridge, UK.
Laboratory for Mechanics of Materials and Nanostructures, EMPA, Swiss Federal Laboratories for Material testing and Research, Thun, Schweiz.
Gordon Laboratory, Dept of Materials Science and Metallurgy, Cambridge, UK.
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2011 (English)In: Philosophical Magazine, ISSN 1478-6435, E-ISSN 1478-6443, Vol. 91, no 7-9, 1190-1199 p.Article in journal (Refereed) Published
Abstract [en]

Experiments have been carried out on how compressive failure of < 100 > axis GaAs micropillars at room temperature is influenced by their diameter. Slip was observed in all micropillars, often on intersecting slip planes. Cracks could nucleate at these intersections and then grow axially in the sample, with bursts of crack growth. However, GaAs micropillars with diameters less than approximately 1 mu m did not split, nor was splitting observed where slip occurred on only one plane. The conditions under which such splitting can occur have been estimated by modifying an existing analysis. This predicts a ductile-brittle transition at a micropillar diameter of approximately 1 mu m, consistent with experimental observations.

Place, publisher, year, edition, pages
2011. Vol. 91, no 7-9, 1190-1199 p.
Keyword [en]
micropillar compression, GaAs, fracture, compression test, scanning electron microscopy
National Category
Engineering and Technology
Research subject
Engineering Science with specialization in Materials Science
Identifiers
URN: urn:nbn:se:uu:diva-157666DOI: 10.1080/14786435.2010.509286ISI: 000288003700013OAI: oai:DiVA.org:uu-157666DiVA: diva2:436110
Available from: 2011-08-22 Created: 2011-08-22 Last updated: 2017-12-08Bibliographically approved

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Leifer, Klaus

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