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Electron-beam microprobe analyses were used to assess the uniformity of titanium distribution in both as-cast and heat-treated uranium-0.5 weight percent titanium (U-0.5 Ti) and uranium-0.75 weight percent titanium (U-0.75 Ti) alloys. Microsegregation due to coring was readily smoothed by heat treatment, but long-range variability remained (on the order of 0.1 wt percent). An attempt was made to examine titanium macrosegregation by a scanning image analysis measurement of the volume fraction of U2Ti in an equilibrium microstructure, but a method for consistently obtaining resolvable U2Ti particles could not be developed. As judged by tensile properties, a homogenization heat treatment of 1000° C for 24 hours was apparently the most effective of those tried for homogenizing the U-0.75 Ti alloy. The large grain size of the as-cast tensile bars apparently caused variability in the tensile-test results such that it was difficult to closely assess the optimum values of the heat-treatment parameters. 8 tables, 25 fig. (auth).
-TR-73-11DA-1-T-062105-A-349*Corrosion, *Uranium, *Uranium alloys, Molybdenum alloys, Titanium alloys, Passivity, Sulfuric acid, Sodium hydroxide, Chromates, Chlorides, Sulfates, Nitrates, Ammunition, Penetration, PolarizationUranium alloy 4/5 Mo, Uranium alloy 3-3/4 Mo, Uranium alloy 1-3/4 Ti, Uranium alloy 3-2/5 TiThe corrosion behavior of U-1.8Mo, U-3.75Mo, U-1.76Ti, U-3.41Ti, and unalloyed uranium has been studied by means of electrochemical measurements. Active-passive behavior was exhibited in sulfuric acid, sodium hydroxide, ammonium hydroxide, sodium sulfate, sodium nitrate, sodium chromate, and ammonium chromate solutions. Chloride additions as small as 0.005M destroyed passivity and caused pitting. Chromates, sulfates, and nitrates behaved as inhibitors in solutions containing low concentrations of chlorides. The uranium-molybdenum alloys were more resistant to corrosion in chloride solutions than the uranium-titanium alloys. (Author).