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- W4283661114 abstract "Abstract For hypereutectic Nb-Si based alloys, primary Nb 5 Si 3 phases typically grow in a faceted mode during equilibrium or near-equilibrium solidification, which damages the ductility and toughness. To address this issue, here we artificially manipulate the growth morphology of Nb 5 Si 3 using electron beam surface melting (EBSM) and subsequent annealing treatments. Results show that such a non-equilibrium solidification pathway enables the transition from faceted growth to non-faceted dendritic growth of Nb 5 Si 3 , along with evident microstructure refinement, generation of metastable β-Nb 5 Si 3 phases and elimination of chemical segregation. The transformation from β-Nb 5 Si 3 to α-Nb 5 Si 3 and Nb solid solution (Nbss) particles is triggered by the annealing treatment at 1450 °C for 5 h. Also, we find the annealing-mediated formation of inherited Nb 5 Si 3 dendrites that maintain the dendritic morphology of the original as-solidified β-Nb 5 Si 3 dendrites. This work thus provides a feasible routine to obtain thermally stable and refined α-Nb 5 Si 3 dendrites in hypereutectic Nb-Si based alloys." @default.
- W4283661114 created "2022-06-29" @default.
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- W4283661114 date "2022-06-28" @default.
- W4283661114 modified "2023-10-18" @default.
- W4283661114 title "Morphological Heredity of Intermetallic Nb5Si3 Dendrites in Hypereutectic Nb-Si Based Alloys via Non-Equilibrium Solidification" @default.
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- W4283661114 doi "https://doi.org/10.1186/s10033-022-00764-7" @default.
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