Effect of interstitial carbon on the evolution of early-stage irradiation damage in equi-atomic FeMnNiCoCr high-entropy alloys
Eryang Lu, Ilja Makkonen, Kenichiro Mizohata, Zhiming Li, J. Räisänen, Filip Tuomisto
Abstract
Owing to their excellent radiation tolerance, some of the high-entropy alloys (HEAs) are considered as potential candidates for structural materials in extreme conditions. In order to shed light on the early-stage irradiation damage in HEAs, we performed positron annihilation spectroscopy on hydrogen implanted equiatomic FeMnNiCoCr and interstitial carbon-containing FeMnNiCoCr HEAs. We reveal primary damage as monovacancies in low dose irradiated HEAs. The enhancement of Frenkel pair recombination by C addition is observed in C-containing HEAs. In addition, the C interstitials suppress the vacancy cluster formation in high dose irradiated HEAs.
Topics & Concepts
Materials scienceIrradiationRadiation damageHigh entropy alloysPositron annihilation spectroscopyVacancy defectCarbon fibersAnnihilationHydrogenPositron annihilationMetallurgyPositronCrystallographyComposite materialChemistryElectronMicrostructureNuclear physicsComposite numberOrganic chemistryPhysicsHigh Entropy Alloys StudiesHigh-Temperature Coating BehaviorsNuclear Materials and Properties