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以改进的低频扭摆内耗仪研究了液态Pb Sn合金连续升温过程的内耗行为 .结果表明 :合金在液相线以上5 0 0— 80 0℃温区内出现内耗峰 ,其峰温不随频率变化 ,峰高与升温速率成正比 ,与振动频率成反比 ,这与固态相变内耗峰的特征相吻合 ;合金成分不同 ,内耗峰峰温不同 ;非共晶成分合金熔体的内耗曲线上出现次峰 .这一现象揭示了Pb Sn合金熔体随温度可能发生结构转变 .对Pb Sn合金进行差热分析 ,熔体出现的热效应峰与内耗峰的温区大体对应 ,进一步揭示熔体的内耗峰可能是由结构转变引起的 .
The internal friction behavior of liquid Pb-Sn alloy during continuous heating was studied by means of an improved low-frequency torsional vibration internal friction instrument.The results show that the internal friction peak appears in the temperature range of more than 5 0 0 0 0 0 0 0 ° C and the peak temperature does not change with frequency, The peak height is proportional to the heating rate and inversely proportional to the vibration frequency, which is in agreement with the characteristic of the internal friction peak of the solid phase transformation. The composition of the alloy is different from that of the internal friction peak, and the secondary peak appears on the internal friction curve of the non-eutectic alloy melt .This phenomenon reveals that the structural transition of PbSn alloy melt may occur with temperature.Diffusion thermal analysis of PbSn alloy shows that the thermal effect peak of the melt generally corresponds to the temperature range of the internal friction peak to further reveal the possible internal friction peak of the melt It is caused by the structural change.