Dose rate dependence of Cr precipitation in an ion-irradiated Fe18Cr alloy. (15th March 2018)

• Record Type: Journal Article
• Authors: Reese, Elaina R.; Almirall, Nathan; Yamamoto, Takuya; Tumey, Scott; Robert Odette, G.; Marquis, Emmanuelle A.
• Is Part Of: Scripta materialia. Number 146(2018)
• Page Start: 213
• Page End: 217
• Publication Date: 2018-03-15
• Subjects: Fe-Cr -- Ion irradiation -- Precipitation -- Dose rate -- Atom probe tomography; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.11.040
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Precipitation of α′ in FeCr alloys under neutron irradiation is thermodynamically driven while being accelerated by radiation-enhanced diffusion. However, similar alloys under ion irradiation at high dose rates (> 10 − 4 dpa/s) fail to exhibit α′ precipitation. Here, the microstructure of an Fe18Cr alloy under ion or neutron-irradiation at 300 °C at dose rates from ~ 10 − 7 to 10 − 4 dpa/s was analyzed by atom probe tomography. The steady-state composition content of the clusters depends on the ion irradiation dose and dose rate, confirming the contribution of ballistic mixing in diluting the Cr concentration in non-equilibrium α′ precipitates. Graphical abstract: Image 2