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Journal article
Elastic properties and hardness values of V2AlC and Cr2AlC single crystals
Physical review materials, v 4(8)
26 Aug 2020
Abstract
Herein we report on a subset of the elastic constants, c(i j), and hardness values of V2AlC and Cr2AlC single crystals by means of microindentation/nanoindentation techniques. Density functional theory (DFT) is also used to calculate the elastic constants. The c(33) and c(11) values determined using a Berkovich tip and those calculated by DFT are all found to fall in the relatively narrow range of 320-350 GPa. These results confirm once again that many of MAX phases are relatively elastically isotropic, especially when compared to many other known layered solids such as graphite and mica. Similarly, the hardness values, obtained using Vickers, Berkovich, and a 5 mu m spherical tip on the two orthogonal Cr2AlC surfaces, are quite comparable and average 9.0 +/- 1 GPa. In all cases, the hardness values are at most 20% higher when the basal planes are loaded along [0001] than when they are loaded edge-on. The Cr2AlC surfaces record an average microyielding stress of 2.7 +/- 0.3 GPa, while the less defective V2AlC crystals linearly sustain stresses of the order of 20 GPa, after which, in approximately 60% of the cases, pop-ins, some of which are substantial, are recorded. Postindentation scanning electron microscope micrographs clearly evidence the plastic anisotropy of these crystals. Large pileups near the indent edges and delamination cracks after loading along the [0001] and [10 (1) over bar0] directions, respectively, are consistent with deformation by ripplocations and ripplocation boundaries, as are the fully and spontaneously recoverable hysteresis stress-strain loops.
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Details
- Title
- Elastic properties and hardness values of V2AlC and Cr2AlC single crystals
- Creators
- Hussein O. Badr - Drexel UniversityAurelie Champagne - Université Catholique de LouvainThierr Ouisse - Univ Grenoble Alpes, Grenoble INP, CNRS, LMGP, F-38000 Grenoble, FranceJean-Christophe Charlier - Université Catholique de LouvainMichel W. Barsoum - Drexel University
- Publication Details
- Physical review materials, v 4(8)
- Publisher
- Amer Physical Soc
- Number of pages
- 12
- Grant note
- 1728041 / CMMI Division of NSF 696656; 785219 / European Union; European Commission Belgium FNRS; Fonds de la Recherche Scientifique - FNRS Wallonie-Bruxelles-International 16/21-077 / Federation Wallonie-Bruxelles through the Action de Recherche Concertee on three-dimensional nanoarchitecturing of two-dimensional crystals 2.5020.11 / Fonds de la Recherche Scientifique de Belgique (F.R.S.-FNRS); Fonds de la Recherche Scientifique - FNRS Chair-of-Excellence Program of the Nanosciences Foundation (Universite Grenoble-Alpes Foundation)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000564804800003
- Scopus ID
- 2-s2.0-85092159823
- Other Identifier
- 991019167935804721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Materials Science, Multidisciplinary