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- W3025671723 abstract "Refractory multi-principal element alloys (MPEAs) have exceptional mechanical properties, including high strength-to-weight ratio and fracture toughness, at high temperatures. Here, we elucidate the complex interplay between segregation, short range order and strengthening in the NbMoTaW MPEA through atomistic simulations with a highly accurate machine learning interatomic potential. In the single crystal MPEA, we find greatly reduced anisotropy in the critically resolved shear stress between screw and edge dislocations compared to the elemental metals. In the polycrystalline MPEA, we demonstrate that thermodynamically-driven Nb segregation to the grain boundaries (GBs) and W enrichment within the grains intensifies the observed short range order (SRO). The increased GB stability due to Nb enrichment reduces the von Mises strain, resulting in higher strength than a random solid-solution MPEA. These results highlight the need to simultaneously tune GB composition and bulk SRO to tailor the mechanical properties of MPEAs." @default.
- W3025671723 created "2020-05-21" @default.
- W3025671723 creator A5001143102 @default.
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- W3025671723 date "2019-12-03" @default.
- W3025671723 modified "2023-09-24" @default.
- W3025671723 title "Complex Strengthening Mechanisms in the NbMoTaW Multi-Principal Element Alloy" @default.
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- W3025671723 doi "https://doi.org/10.48550/arxiv.1912.01789" @default.
- W3025671723 hasPublicationYear "2019" @default.
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