Atomic structures and compositions of internal interfaces. Progress report, September 1, 1993--August 31, 1994

An atomic scale study was made of the Ag/CdO(222) heterophase interface produced by internal oxidation of a Ag(Cd) alloy, using HREM and atom-probe field-ion microscopy (APFIM). A study was commenced of interfacial segregation at metal/metal oxide interfaces; the system being studied is the Cu(Ag)/MgO(222) heterophase interface, where Ag is the segregating species. A study was made of the necessary conditions to measure the oxygen content in MgO precipitates produced by internal oxidation of Cu(Mg) alloys, using APFIM. We are also studying solute-atom segregation at grain boundaries in Ni-Pd alloys via computer simulations and combined APFIM/TEM