Abstract
The kinetics of Nb3Sn phase formation in commercial multifilamentary wires have been studiedas a function of time and temperature using time-resolved, in situneutron diffraction. This work shows that at higher temperatures theNb3Sn phaseforms in a fraction of the recommended annealing time. A temperature-independent Avrami exponent ofn = 0.51 ± 0.01 wasobserved, indicating a diffusion-controlled growth mechanism, and a large apparent activation energyof Ea = 10 ± 1 eV is reported where the energies of nucleation and growth both contribute.
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