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  Extraction of plasticity parameters of GaN with high temperature, in situ micro-compression

Wheeler, J. M., Niederberger, C., Tessarek, C., Christiansen, S., & Michler, J. (2013). Extraction of plasticity parameters of GaN with high temperature, in situ micro-compression. INTERNATIONAL JOURNAL OF PLASTICITY, 40, 140-151. doi:10.1016/j.ijplas.2012.08.001.

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 Creators:
Wheeler, J. M.1, Author
Niederberger, C.1, Author
Tessarek, C.2, Author              
Christiansen, S.2, 3, Author              
Michler, J.1, Author
Affiliations:
1external, ou_persistent22              
2Micro- & Nanostructuring, Technology Development and Service Units, Max Planck Institute for the Science of Light, Max Planck Society, ou_2364725              
3Christiansen Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society, ou_2364716              

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Free keywords: CRYSTAL GALLIUM NITRIDE; BULK METALLIC-GLASS; ELEVATED-TEMPERATURES; MICROPILLAR COMPRESSION; YIELD STRENGTH; DISLOCATION MOBILITY; ELECTRON-MICROSCOPY; NANOINDENTATION; DEFORMATION; INDENTATIONEngineering; Materials Science; Mechanics; yield condition; crystal plasticity; electron microscopy; mechanical testing;
 Abstract: Micro-pillar compression has been utilised in a novel elevated temperature technique, in situ in the SEM to characterise the plasticity of gallium nitride (GaN) {0001}-oriented euhedral prisms grown by metallorganic vapor phase epitaxy. Electron backscatter diffraction was used to confirm the orientation of the prisms, and deformation was observed to occur via 2nd order pyramidal slip on the (11 (2) over bar2)(11 (2) over bar3) slip system. Analysis of the micro-compression data allowed extraction of fundamental deformation parameters of GaN from 24.5 to 479.3 degrees C. The strain rate sensitivity parameter was determined to be 0.0234 +/- 0.0073 both by constant strain rate micro-compressions and micro-compression strain rate jump tests. The measured activation volume was 3.88 +/- 0.13 x 10(-29) m(3), and the activation energy was 0.9 +/- 0.2 eV. (c) 2012 Elsevier Ltd. All rights reserved.

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Language(s): eng - English
 Dates: 2013
 Publication Status: Published in print
 Pages: 12
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
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Title: INTERNATIONAL JOURNAL OF PLASTICITY
Source Genre: Journal
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Publ. Info: THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND : PERGAMON-ELSEVIER SCIENCE LTD
Pages: - Volume / Issue: 40 Sequence Number: - Start / End Page: 140 - 151 Identifier: ISSN: 0749-6419