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Microstructures of Ni ion irradiated Fe-15Cr-20Ni austenitic steels doped with Si and Ti have been observed for the purpose of pursuing mechanisms of swelling suppression by the solute addition. In Si... doped specimens, prominent segregation of Si at grain boundaries and formation of gamma’ precipitates were observed. This implies strong interactions between Si atoms and lattice defects. These interactions are thought to result in suppression of void swelling. In Si and Ti doped specimens, formation of G phase in matrix and formation of tiny bubbles at G phasematrix interfaces are observed. This suggests another mechanism of swelling suppression, i.e. gettering helium from matrix reducing void nucleation rate.show more
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