Atom Probe Field-Ion Microscopy Characterization of Nickel and Titanium Aluminides

A review of the contributions of atom probe field-ion microscopy to the characterization of nickel and titanium aluminides is presented. The nickel aluminide systems studied include boron-doped Ni3Al and boron-, carbon-, beryllium-, zirconium-, molybdenum-, and hafnium-doped NiAl. These systems have been characterized in terms of solute segregation to boundaries, dislocations, and other defects, matrix solubilities, precipitation, and site-occupation probabilities. The partitioning behavior of impurities and alloying additions, matrix solubilities, precipitate compositions, and interfacial segregation in several of α2 + γ titanium aluminides and related alloys are also reviewed. Published by Elsevier Science Inc.