Abstract
Various NbSn and NbNbSn 2 powder mixtures have been thermally cycled over the temperature range 650–1000°C in a differential thermal analysis unit to determine the alloying behaviour of the powders and to determine data that might be of use in the assessment of the various versions of the NbSn phase diagram. Only the low % Sn mixtures were found to approach their equilibrium states during the cycling. Mixtures high in Sn segregated into separate tin-rich and niobium-rich layers. NbSn 2 was found to decompose during cycling to yield Nb 3Sn and Sn because of the very slow kinetics of the peritectic reactions by which Nb 6Sn 5 and NbSn 2 are formed during the cooling part of the thermal cycle.
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