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Abstract

Evolution of the medium range order (MRO) in Cu-Sn alloy melts with different compositions at the same superheat temperature has been studied. A prepeak, which characterises the MRO, appeared in front of the main peak. Based on the positions Q_pp and heights H_pp of the prepeak on the structure factors of liquid Cu-Sn alloys, it was found that the Q_pp was higher around Cu₅Sn, and the highest at Cu₅Sn while the H_pp was smaller, and a minimum at Cu₅Sn. As proved by the first peak of the pair correlation functions and the coordination numbers, the molten structure of Cu-Sn changes from order to disorder largely when the tin concentration is in the range of 35.3-60 wt-%. In addition, a shoulder appears on the right side of the first peak of the pair correlation function and shifts to small r (real space).

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Relativity of medium range order in molten Cu–Sn alloys and phase diagram

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