Quantitative long-range-order measurement and disordering efficiency estimation in ion-irradiated bulk Ni3Al using cross-sectional conventional transmission electron microscopy

Irradiation-induced disordering of bulk Ni3Al under 6 MeV Ni2+ irradiation is studied at room temperature. A self-consistent long-range-order quantifi cation method for ion-irradiated intermetallics is presented using cross-se ctional sample preparation and conventional transmission electron microscop y in selected area diffraction depth profiling mode. This method, which doe s not require the full assessment of dynamic diffraction image simulation i nformation, is unique to precisely measure long-range-order as a function o f depth or dose for a single total fluence. The disordering efficiency cons tant epsilon is estimated in the range 10.0 +/- 0.7/dpa for a total fluence of 10(14) cm(-2). (C) 2000 American Institute of Physics. [S0003-6951(00)0 3543-9].