The formation of the Nb3Al A15 phase under equilibrium conditions is studied on bulk, homogenized samples. Due to compositional effects, Tcof samples annealed during long periods at temperatures below 900°C is found to be close to 12 K. It follows that the high Tcvalues (15-16 K) observed on multifilamentary Nb3Al wires reacted at these temperatures cannot be interpreted on the basis of the equilibrium phase diagram.
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Jordá et al. (1981) studied this question.
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