Abstract
Viscosity of liquid Cu-Sn alloys was measured by the rotational oscillation method. The relation between logarithmic decrements of oscillation and viscosities was determined by using water, glycerol, mercury, and liquid tin whose densities and viscosities are known accurately. Values of density of liquid alloys requisite for the determination of viscosity were taken from the literature.Viscosity of liquid copper was expressed by the following equation:(This article is not displayable. Please see full text pdf.) Viscosity of liquid Cu-Sn alloys decreased with increase in tin content, but the anomaly, that is, an increase in viscosity was found over a composition range from 32 to 40% Sn. It was considered that this anomaly is due to the presence of a mixture of clusters such as Cu4Sn, Cu8Sn2, and Cu6Sn2.
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