Abstract
Abstract The precipitation behaviour in thin foils and wire specimens of Ti-Nb alloys has been investigated mainly by means of small-angle X-ray scattering measurement but also by tramsmission electron microscopy. The small-angle diffuse scattering was observed in the later stage of ageing and it was concluded that α particles formed. The change of relative integrated intensity and Guinier radius was measured during ageing. The integrated intensity in the alloys aged after cold working was rather larger than that in the alloy without cold working, but in contrast the Guinier radius became smaller. The cold working was found to accelerate the precipitation of the α phase. The relative interparticle distance became constant after short term ageing for all specimens with various rates of cold working. A commercial quaternary alloy, Ti-27 at.% Nb-5 at.% Zr-5 at.% Ta, was also examined. Its precipitation behaviour was similar to that of the binary alloys and it produced the largest integrated intensity in smal...
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