Atomistic simulations of the local slip resistances in four refractory multi-principal element alloys
نویسندگان
چکیده
The design and development of structural materials that can survive under the extreme conditions operation are critical to next generation aerospace energy technologies. Selectively designed multi-principal element alloys (MPEAs), which solid solution phases with three or more principal elements on simple underlying lattices, expected fulfill such requirements. combination refractory metals known for enhancing oxidation resistance, high temperature strength, thermal stability makes them ideal candidates applications. Due their unique microstructures chemical compositions, MPEAs may exhibit excellent mechanical properties, as strengths at elevated temperatures improved hardnesses. Improving properties requires knowledge plastic deformation mechanisms, core is dislocation slip, intimately connected local slip resistances (LSRs). In this work, atomistic calculations conducted obtain LSRs edge screw dislocations planes – {110}, {112}, {123} in four MPEAs, CrMoNbTa, CrNbTaW, MoNbTaV, MoNbTaW.The goal work determine LSR role lattice distortion has. We find two containing Cr bear an increased achieve highest values lowest anisotropy LSR. It also shown possess much lower resistance than pure metals.
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ژورنال
عنوان ژورنال: International Journal of Plasticity
سال: 2022
ISSN: ['1879-2154', '0749-6419']
DOI: https://doi.org/10.1016/j.ijplas.2021.103157