Author/Authors :
Sun، نويسنده , , C. and Yu، نويسنده , , K.Y. and Lee، نويسنده , , J.H. and Liu، نويسنده , , Y. and Wang، نويسنده , , H. and Shao، نويسنده , , L. and Maloy، نويسنده , , S.A. and Hartwig، نويسنده , , K.T. and Zhang، نويسنده , , X.، نويسنده ,
Abstract :
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.
