|About this Abstract
||Materials Science & Technology 2019
||Materials for Nuclear Applications
||Effects of Ti and Al Additions on Irradiation Behavior of FeMnNiCr Based High-Entropy Alloys
||Matthew J. Luebbe, Andrew Hoffman, Hans Pommeranke, Li He, Kumar Sridharan, Haiming Wen
|On-Site Speaker (Planned)
||Matthew J. Luebbe
High-entropy alloys (HEAs) are a new class of multi-component alloys that are of interest for potential use in nuclear reactors due to their good high-temperature strength and unique radiation damage resistance. Because of Co activation concerns, Co-free HEAs must be developed for nuclear applications. In this study, two Co-free HEAs, Fe30Mn30Ni30Cr10 (single-phase FCC) and Fe28.2Mn28.2Ni28.2Cr9.4Ti2Al4 (FCC matrix with Ni3(Al,Ti) precipitates), were irradiated by Fe ions at 300 and 500°C up to 100 dpa. After irradiation, nanoindentation and transmission electron microscopy (TEM) were performed to determine the irradiation behavior of both alloys. When irradiated at both 300 and 500°C, Fe28.2Mn28.2Ni28.2Cr9.4Ti2Al4 developed larger dislocation loops (~50-75nm) as compared to Fe30Mn30Ni30Cr10, which developed a high number density of small loops (~15nm). The Fe30Mn30Ni30Cr10 HEA showed good phase stability after irradiation, but some voids and small secondary phases developed at 500°C. In the Fe28.2Mn28.2Ni28.2Cr9.4Ti2Al4 alloy irradiated at 500°C, small (~30nm) TiC precipitates were observed.