Abstract
In an attempt to probe the effect of vacancy-related defects on the crystalline-to-amorphous phase transformation, positron annihilation lifetime measurements were performed on Nb 3Sn with the A15 structure as a function of mechanical milling. The lifetime spectra were deconvoluted into two components. Both components increased during the initial stage of milling, consistent with an increase in the concentration of the vacancy-type defects and void-type defects formed as a result of milling. The formation of these types of defects plays an important role in the amorphization reaction of A15 Nb 3Sn.
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