Abstract
The effect of radiation-induced dislocation loops on hardness in ion-irradiated Ni-Cu alloys has been studied using a recently developed mechanical properties microprobe (MPM). Well-annealed Ni-10 at. pct Cu and Ni-50 at. pct Cu were irradiated with 14-MeV Ni ions to doses of 20 to 100 displacements per atom (dpa) peak damage (5 to 25 dpa at 1 μm) at 0.45Tm (485 °C and 425 °C, respectively). Ultra-low load microindentation hardness measurements and transmission electron microscopy (TEM) were done using cross-sectional techniques. These methods allow for direct hardness measurements, which have been compared to the unirradiated material, of only the small irradiation zone (<3-μm deep). Irradiation induced a high density of dislocation loops, with the size and density of the loops dependent on composition and independent of irradiation conditions. This high dislocation loop density caused a large increase in hardness. A reasonable correlation was found between measured hardness changes and calculated changes based on dislocation loop sizes and densities.
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