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- W4387522013 abstract "The eutectic high-entropy alloys have shown promising mechanical behaviours while their softening at elevated temperatures is still a challenge. Generally, the boundaries are the weak parts to be strengthened with increased temperatures in eutectic high-entropy alloys. Here, we found that the minor addition of boron in Ni30Co30Cr10Fe10Al18W2 eutectic high-entropy alloy can significantly strengthen the FCC grain boundaries and the FCC/B2 phase boundaries at elevated temperatures. A remarkable tensile yield strength over 581 MPa with elongation of 71% at 800°C is achieved with minor boron addition, corresponding to a 45% increase in yield strength and 129% improvement in ductility compared with the boron-free counterpart. Accompanied by the boron-strengthened phase boundary, sustainable dynamic recovery occurs in the FCC and B2 phases during high-temperature tensile testing, ensuring excellent ductility. Moreover, the benchmark test indicates that the strengthening effect of boron and borides on the boundaries contributes up to 166 MPa to the yield strength of eutectic high-entropy alloy at 800°C. These findings shed light on the development of high-temperature eutectic high-entropy alloys with a microalloying strategy." @default.
- W4387522013 created "2023-10-12" @default.
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- W4387522013 date "2024-01-01" @default.
- W4387522013 modified "2023-10-16" @default.
- W4387522013 title "Boron microalloying for high-temperature eutectic high-entropy alloys" @default.
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- W4387522013 doi "https://doi.org/10.1016/j.actamat.2023.119427" @default.
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