Abstract
Despite Laves phase precipitate in advanced accident-tolerant FeCrAl alloys has been reported to have remarkable properties, its irradiation resistance and phase stability are unexplored largely. Here, we investigate the response of Laves phase precipitate in Fe-13.5Cr-4.7Al alloys through in-situ TEM observation during 400 keV Fe+ irradiation with different cumulative dose at a wide temperature range from room temperature to 823 K. The detailed relationship between critical dose and temperature for the crystalline-to-amorphous transformation was established. In the low temperature region (≤748 K), the critical dose was almost independent of temperature, while at higher temperatures, the increase of temperature could significantly delay the amorphization process. Even when irradiated to 11.76 dpa at 823 K, no obvious dissolution of Laves phase precipitate was observed. It was observed for the first time that the Al in Laves phase precipitate and FeCrAl matrix would diffuse to phase boundary, resulting in the segregation of Al at phase boundary.
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