Interstitial migration behavior and defect evolution in ion irradiated pure nickel and Ni-xFe binary alloys
CY Lu and T Yang and LN Niu and Q Peng and K Jin and ML Crespillo and G Velisa and HZ Xue and FF Zhang and PY Xiu and YW Zhang and F Gao and HB Bei and WJ Weber and LM Wang, JOURNAL OF NUCLEAR MATERIALS, 509, 237-244 (2018).
Transition from long-range one-dimensional to short-range three- dimensional migration modes of interstitial defect clusters greatly reduces the damage accumulation in single-phase concentrated solid solution alloys under ion irradiation. A synergetic investigation with experimental, computational and modeling approaches revealed that both the resistance to void swelling and the delay in dislocation evolution in Ni-Fe alloys increased with iron concentration. This was attributed to the gradually increased sluggishness of defect migration, which enhances interstitial and vacancy recombination. Transition from long- range one-dimensional defect motion in pure nickel to short-range three- dimensional motion in concentrated Ni-Fe alloys is continuum, not abrupt, and within an iron concentration range up to 20%. The gradual transition process can be quantitatively characterized by the mean free path of the interstitial defect clusters. Published by Elsevier B.V.
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