Elevated Temperature Deformation Mechanisms in Single-crystalline RMPEAs
- Date: Oct 15, 2026
- Time: 11:30 AM - 12:30 PM (Local Time Germany)
- Speaker: Daniel Magnuson
- Johns Hopkins University, Baltimore (USA)
- Location: Max Planck Institute for Sustainable Materials
- Room: Large Conference Room No. 203
- Host: on invitation of Prof. Gerhard Dehm
Studies of RT dislocation motion in BCC RMPEAs have evidenced increased activation of higher order slip systems and a multiplicity of slip; a fundamental departure from the dislocation motion in BCC metals and dilute alloys. Single-phase ternary RMPEAs are used as model systems for investigating these novel deformation mechanisms. In this study, the first single-crystals of MoNbTi were grown and tested in tension at temperatures exceeding 1,000oC. Post-mortem slip trace and TEM characterization of deformed specimens, combined with phase field dislocation dynamics (PFDD) simulations, allowed us to confirm the multiplicity of slip at temperatures exceeding 1,000oC and to elucidate the dislocation processes that underpin ultrahigh temperature plasticity in these alloys.