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- W4322012164 abstract "Excellent strain hardening capability holds the key toward a good strength-ductility combination of high- or medium-entropy alloys (HEAs or MEAs). Generally, metastability engineering and heterostructure are known to be two independent strategies for strain hardening. In this work, a hetero-structured metastable (Fe57.5Co20Cr12.5Ni5Mo3V2)99.8C0.2 HEA was prepared in order to incorporate the merits of metastability and heterostructure in one alloy. The annealing microstructure of this alloy consists of heterogeneous face-centered cubic (FCC) grains decorated with various precipitates, including the intergranular submicron M6C precipitates, the intragranular nano-sized MC and σ phase. These multiscale precipitates can act as both compositional and dimensional regulators of FCC grains, assisted by tailoring the annealing parameters. The decrease of annealing temperature or duration produces a larger-volume fraction of precipitates and induces carbon-lean FCC grains with a bimodal grain size distribution. Such precipitate-mediated metastability can successively activate the strain-induced FCC→HCP→BCC martensitic transformation (SIMT) over a large strain range. The sequential operation of multiple deformation mechanisms, such as stacking faults, continuous SIMT and precipitation strengthening, ensures an extremely high strain hardening peak (∼4000 MPa) at a high strain level (0.37) and, therefore, achieves a superior synergy of ultimate tensile strength (942 MPa) and total elongation (59%)." @default.
- W4322012164 created "2023-02-26" @default.
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- W4322012164 date "2023-04-01" @default.
- W4322012164 modified "2023-10-14" @default.
- W4322012164 title "Precipitate-mediated metastability of a hetero-structured ferrous high-entropy alloy with superior strain hardening ability" @default.
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- W4322012164 doi "https://doi.org/10.1016/j.msea.2023.144853" @default.
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