![]() ![]() 147–150 A usual set of microstructures such as dislocation loops, voids, gas-filled bubbles and secondary phase precipitates are formed in these materials under irradiation that can be treated as discussed above. MEAs and HEAs usually consist of three and more elements of close to equiatomic composition and are considered now as very promising structural materials including for nuclear applications. Such a RIS mechanism is reminiscent of what is suggested in most of the RIS models of austenitic steels.Īlthough this case is not directly related to radiation induced obstacles, we consider it here because of the increasing interest to so called medium- and high-entropy alloys (MEAs and HEAs). These observations are consistent with a RIS mechanism dominated by a vacancy flux coupling, the latter being modeled trough an inverse Kirkendall process. 71 According to tracer diffusion experiments, Mn is the fastest vacancy diffuser in these alloys and Co is the slowest diffuser. have observed Mn depletion and Co and Ni enrichment at grain boundaries, upon ion irradiation of an equiatomic CoCrFeNiMn. The formation of a L1 0 (NiMn) ordered phase and a spinodal decomposition between Co/Ni and Pd (also observed during long term annealing) is accelerated by irradiation.īarr et al. ![]() 70 The authors relate this behavior to the atomic size of the elemental species. Segregation at radiation-induced dislocation loops in CrFeCoNi, CrFeCoNiMn, and CrFeCoNiPd alloys have been observed during electron irradiation, showing depletions in Cr/Fe/Mn/Pd and enrichments in Co/Ni. High entropy alloys, with equal or relatively large proportions of five or more elements have recently received considerable attention, and a few experimental studies of RIS have been published. Maylise Nastar, Frédéric Soisson, in Comprehensive Nuclear Materials (Second Edition), 2020 1.08.2.6 RIS in High Entropy Alloys ![]()
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