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Monofilamentary Nb3Sn superconductors are prepared by reaction between Nb6Sn5 powder and Nb.

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The aim of the study was to relate the general corrosion behaviour of CuNi 10-alloys in seawater with its iron content and microstructure. To that end the microstructure of four commercial alloys with various Fe-contents (1.20-1.78%) and three laboratory melted alloys with various Fe-contents (1.5-2.5%) were investigated in the as delivered state and after three different heat treatments. Samples of these alloys were exposed to flowing natural seawater. During exposure electrochemical measurements were performed. After exposure the weight loss was determined. Moreover, for a number of samples the corrosion products were analysed by means of electron microprobe analysis.Irrespective of the Fe-content, the presence of discontinuous precipitates in the laboratory melted alloys turned out to be detrimental with regard to general corrosion. To a less extent this also holds for alloys with high concentrations of continuous precipitates, as observed for iron contents of 2 and 2.5%. The precipitate free alloys as well as the ones containing low concentrations of continuous precipitates because of low Fe-concentrations (S 1.5% Fe) do show a good corrosion behaviour.

X-ray diffraction profile studies on the filings of stoichiometric and off-stoichiometric compositions of Ni3AI alloys, with and without boron additions, were conducted to clarify some of the significant anomalies noticed in the literature. The long-range order parameter was estimated as a function of temperature in all the four alloys from (1 00)/(200) and (1 1 0)/(2 2 0) pairs of reflections. The L 12 structure appears to attain a maximum stability at about 600 ~ around which temperature its order parameter was close to the theoretical value. Above 600 ~ this structure becomes less stable and there appears to be formation of an additional structure of a lower symmetry.~.