Enhanced radiation tolerance of ultrafine grained Fe–Cr–Ni alloy
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The evolutions of microstructure and mechanical properties of Fe-14Cr-16Ni (wt.%) alloy subjected to Helium ion irradiations were investigated. Equal channel angular pressing (ECAP) process was used to significantly reduce the average grain size from 700 μm to 400 nm. At a peak fluence level of 5.5 displacement per atom (dpa), helium bubbles, 0.5-2 nm in diameter, were observed in both coarse-grained (CG) and ultrafine grained (UFG) alloy. The density of He bubbles, dislocation loops, as well as radiation hardening were reduced in the UFG Fe-Cr-Ni alloy comparing to those in its CG counterpart. The results imply that radiation tolerance in bulk metals can be effectively enhanced by refinement of microstructures. © 2011 Elsevier B.V. All rights reserved.
author list (cited authors)
Sun, C., Yu, K. Y., Lee, J. H., Liu, Y., Wang, H., Shao, L., ... Zhang, X.