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Berlin 2018 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 69: Structural Materials (Steels, light-weight materials, high-temperature materials)

MM 69.1: Talk

Friday, March 16, 2018, 09:30–09:45, H 0106

Dislocation dissociations in C11b MoSi2 and their impact on its plastic deformationVáclav Paidar1, Miroslav Čák2, •Mojmír Šob3,4,5, and Václav Vitek61Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czechia — 2ICAMS, Ruhr-Universität Bochum, Germany — 3Central European Institute of Technology, CEITEC MU, Masaryk University, Brno, Czechia — 4Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Brno, Czechia — 5Department of Chemistry, Faculty of Science, Masaryk University, Brno, Czechia — 6Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA, U.S.A.

Using the DFT calculated γ-surfaces possible metastable stacking faults have been found for the most common slip planes {013) and {110) in MoSi2. These calculations reveal three distinct stacking faults on {013) planes and one stacking fault on {110} plane. Owing to such multiplicity of metastable stacking faults there is a large number of possible dislocation dissociations. These dislocation splittings are analysed using the anisotropic elasticity and relevant stacking faults. The results show that the only dissociations of the <331] dislocations favoured over the complete undissociated dislocations are on {013) planes either in one or two planes of this type. Splitting into {110) planes are never favored. For loading along the [001] axis the dislocation glide may take place at high temperatures when the cross slip releases the sessile screw dislocations on two {013) planes.

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