Dresden 2020 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 30: Poster Session II
MM 30.10: Poster
Tuesday, March 17, 2020, 18:15–20:00, P4
Effect of residual stresses on dislocation nucleation and motion in lamellar TiAl alloys — •Ashish Chauniyal and Rebecca Janisch — ICAMS, Ruhr Universität Bochum
Residual stresses are present within many microstructures due to lattice mismatch, curvature effects and/or processing history. These residual stresses are a known cause for microyielding and localized plasticity. In this work we study the effect of residual stresses on dislocation nucleation and motion using a two phase TiAl lamellar system. The lattice mismatch between hexagonal α2(Ti3Al),face centered tetragonal γ(TiAl) phases creates coherency stresses in individual phases. These residual stresses are a known cause for microplasticity in lamellar TiAl. In this work we carry atomistic simulations of α2/γ bilayers with a dislocation nucleator in γ phase which emits dislocation loops during deformation. Using this framework, we study the mechanism of emission, propagation and interface interactions of dislocations in a α2/γ bicrystal, in correlation with coherency stresses present within the lamellae.