Quantitative long-range-order measurement and disordering efficiency estimation in ion-irradiated bulk Ni_(3)Al using cross-sectional conventional transmission electron microscopy

摘要

Irradiation-induced disordering of bulk Ni_(3)Al under 6 MeV Ni~(2+) irradiation is studied at room temperature. A self-consistent long-range-order quantification method for ion-irradiated intermetallics is presented using cross-sectional sample preparation and conventional transmission electron microscopy in selected area diffraction depth profiling mode. This method, which does not require the full assessment of dynamic diffraction image simulation information, is unique to precisely measure long-range-order as a function of depth or dose for a single total fluence. The disordering efficiency constant ∈ is estimated in the range 10.0±0.7/dpa for a total fluence of 10~(14) cm~(-2).