2019
DOI: 10.1140/epjb/e2019-100244-y
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Radiation-induced segregation in W-Re: from kinetic Monte Carlo simulations to atom probe tomography experiments

Abstract: A viable fusion power station is reliant on the development of plasma facing materials that can withstand the combined effects of high temperature operation and high neutron doses. In this study we focus on W, the most promising candidate material. Re is the primary transmutation product and has been shown to induce embrittlement through cluster formation and precipitation below its predicted solubility limit in W. We investigate the mechanism behind this using a kinetic Monte Carlo model, implemented into Sto… Show more

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Cited by 19 publications
(8 citation statements)
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References 29 publications
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“…This is consistent with the concentration of the σ phase intermetallic in W-Re. A similar transformation was observed in previous parameterisations of W-Re [35,36]. For the W-Os system, two transformations are visible, one from 0-50 at.%Os and a second from 50-75 at.% Os.…”
Section: Phase Analysissupporting
confidence: 87%
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“…This is consistent with the concentration of the σ phase intermetallic in W-Re. A similar transformation was observed in previous parameterisations of W-Re [35,36]. For the W-Os system, two transformations are visible, one from 0-50 at.%Os and a second from 50-75 at.% Os.…”
Section: Phase Analysissupporting
confidence: 87%
“…The parameterisation presented in the previous section was implemented into a modified version of the open source Stochastic Parallel PARticle Kinetic Monte Carlo Simulator (SPPARKS) code, discussed in previous publications [36]. In this model, process rates are calculated using the change in energy, ∆E ij , between the initial and final states, i and j, respectively.…”
Section: Monte Carlo Simulationsmentioning
confidence: 99%
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“…Moreover, 50 at.% Re precipitates are probably the strongest among the possible coherent precipitates. As was revealed in the recent kinetic Monte Carlo study of precipitation in W-Re alloys, the concentration limit for small quasi-spherical precipitates is ~ 30-50% Re atoms due to the specific kinetics of their nucleation and growth [50,51]. Comparison of strengthening due to voids and 50 at.% Re precipitates demonstrates that the latter are significantly weaker (see Fig.…”
Section: Discussionmentioning
confidence: 61%
“…While the most stable self-interstitial configuration in W is an 111 dumbbell, which undergoes fast 1D migration [44,48], the strong binding of Re and Os atoms to self-interstitial defects leads to the formation of W-solute mixed interstitial dumbbells, which can undergo effective 3D migration via a series of translation and rotation processes [49,[80][81][82][83][84][85][86][87][88]. Kinetic Monte Carlo (KMC) models where this transport process was implemented have predicted the formation of Re rich precipitates, facilitated primarily by W-Re mixed interstitial migration [89,90]. Neither of these studies correctly captured vacancy clustering because of the adopted pair interaction Ising model.…”
Section: Introductionmentioning
confidence: 99%