Irradiation induced creep in nanocrystalline high entropy alloys

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Abstract

Irradiation induced creep (IIC) compliance in NiCoFeCrMn high entropy alloys is measured as a function of grain size (30 < x < 80 nm) and temperature (23–500 °C). For 2.6 MeV Ag3+ irradiation at a dose rate of 1.5×10–3 dpa−1s−1 the transition from the recombination to sink limited regimes occurs at ∼ 100 °C. In the sink-limited regime, the IIC compliance scales inversely with grain size, consistent with a recently proposed model for grain boundary IIC. The thermal creep rate is also measured; it does not become comparable to the IIC rate, however, until ∼ 650 °C. The results are discussed in context of defect kinetics in irradiated HEA systems.

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Jawaharram, G. S., Barr, C. M., Monterrosa, A. M., Hattar, K., Averback, R. S., & Dillon, S. J. (2020). Irradiation induced creep in nanocrystalline high entropy alloys. Acta Materialia, 182, 68–76. https://doi.org/10.1016/j.actamat.2019.10.022

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