Investigation of the phase separation of Al-Bi immiscible alloy melts by viscosity measurements

Investigation of the phase separation of Al-Bi immiscible alloy melts by viscosity measurements
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通过粘度测量研究 Al-Bi 不混溶合金熔体的相分离

DOI:
10.1063/1.3702865
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发表时间:
2012-04
影响因子:
3.2
通讯作者:
C.J. Li
C.J. Li
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Y.Q. Wu;C.J. Li

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用扭振粘度计测量了Al 96 Bi 4、Al 93 Bi 7、Al 90 Bi 10和纯Bi等不互溶合金的粘度随温度的变化关系。在临界温度附近,粘度随温度的变化偏离了Arrhenius方程。根据临界动力学理论和金属熔体的类气体性质,用修正的粘度方程拟合了临界温度附近粘度随温度的变化关系。对于修正的粘度,活化能是温度Ev(T)= E0 + TScf的函数。分子有序度的变化由构型熵Scf反映。对于纯Bi熔体,在凝固过程中,熔体的分子有序度增加,并实现了长程有序。对于Al-Bi不混溶合金,分子有序度增加,实现相分离。
The viscosity dependence of immiscible alloys, such as Al96Bi4, Al93Bi7, Al90Bi10 and pure Bi on temperature was measured using a torsional oscillation viscometer. The variation in viscosity with temperature deviated from the Arrhenius equation near the critical temperature. The temperature dependence of the viscosity near the critical temperature could be fitted using an amended viscosity equation based on the critical dynamics theory and gas-like property of metal melts. For the amended viscosity, the activation energy is a function of temperature Ev(T) = E0 + TScf. The change in molecular degree of order is reflected by the configuration entropy, Scf. For the pure Bi melt, during the solidification process, the molecular degree of order of the melt increased and achieved long range order. For the Al-Bi immiscible alloys, the molecular degree of order increased and achieved phase separation.
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发表时间: 1993-04
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