Observation of a reversible liquid-liquid structural change in Pb-Sn melts with electrical resistivity method

摘要

In recent years, a number of studies with different methods dedicated to structures and properties of liquid alloys revealed the occurrence of temperature-induced liquid-liquid structural transformation (TI-LLST). As yet, however, few investigations have concerned the reversibility of TI-LLST. The present paper reports a reversible TI-LLST in Pb-Sn alloys, which was observed with the electrical resistivity method during succeeding cooling and heating runs after the first heating process. The reversible TI-LLST is not the same as the TI-LLST in the first heating run, because the temperature ranges and the patterns are different from those of the latter. It is interesting that the similar phenomenon is also observed in pure tin, which suggests that the reversible TI-LLST in liquid Pb-Sn alloy is related to that in liquid Sn.