NSUF 20-4147: In Situ and Ex Situ Investigations of Irradiation Damage in Nanostructured ODS High-Entropy Alloys
The objective of this RTE project is to use the in situ and ex situ dual ion irradiation experiments at Michigan Ion Beam Laboratory to investigate the irradiation damage in nanostructured oxide-dispersion-strengthened high-entropy alloys (ODS-HEAs) at elevated temperatures. HEAs have superior mechanical properties, thermal stability, corrosion resistance, and radiation tolerance, rendering them promising structural materials for fast reactor applications. However, a significant limitation for the high-temperature applications of HEAs is the tensile strength reduction and thermal creep at above 500 ºC. To address this challenge, the PI’s lab has developed novel ODS-HEAs that exhibit a homogenous dispersion of nanometer-size oxide particles in the HEA matrix, which can retard the dislocation and reduce grain coarsening, thus increasing the high-temperature strength and creep resistance of HEAs. This proposal will address two scientific questions: (1) how the nanoscale particle/matrix interfaces affect the defect annihilation and helium trapping behavior; and (2) how stable are the fine microstructures in ODS-HEAs in high-temperature irradiation environments? This proposal will use experimental approaches that involve in situ and ex situ dual ion irradiation and electron microscopy characterizations to examine the fundamental mechanisms and thus evaluate the feasibility of ODS-HEAs as the potential structural materials for fast reactors.
Additional Info
| Field | Value |
|---|---|
| Abstract | The objective of this RTE project is to use the in situ and ex situ dual ion irradiation experiments at Michigan Ion Beam Laboratory to investigate the irradiation damage in nanostructured oxide-dispersion-strengthened high-entropy alloys (ODS-HEAs) at elevated temperatures. HEAs have superior mechanical properties, thermal stability, corrosion resistance, and radiation tolerance, rendering them promising structural materials for fast reactor applications. However, a significant limitation for the high-temperature applications of HEAs is the tensile strength reduction and thermal creep at above 500 ºC. To address this challenge, the PI’s lab has developed novel ODS-HEAs that exhibit a homogenous dispersion of nanometer-size oxide particles in the HEA matrix, which can retard the dislocation and reduce grain coarsening, thus increasing the high-temperature strength and creep resistance of HEAs. This proposal will address two scientific questions: (1) how the nanoscale particle/matrix interfaces affect the defect annihilation and helium trapping behavior; and (2) how stable are the fine microstructures in ODS-HEAs in high-temperature irradiation environments? This proposal will use experimental approaches that involve in situ and ex situ dual ion irradiation and electron microscopy characterizations to examine the fundamental mechanisms and thus evaluate the feasibility of ODS-HEAs as the potential structural materials for fast reactors. |
| Award Announced Date | 2020-07-14T14:10:01.3 |
| Awarded Institution | None |
| Facility | None |
| Facility Tech Lead | Kevin Field |
| Irradiation Facility | None |
| PI | Bai Cui |
| PI Email | [email protected] |
| Project Type | RTE |
| RTE Number | 4147 |