Elevated Temperature Deformation Mechanisms in Single-crystalline RMPEAs

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 1,000

C. 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 1,000

C and to elucidate the dislocation processes that underpin ultrahigh temperature plasticity in these alloys. Speaker: Daniel Magnuson

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