Abstract
Abstract The growth of cadmium whiskers from the vapor is described. Growth rates were measured at a supersaturation of approximately 0.1 in atmospheres of argon and of an oxygen-argon mixture. The growth rates are dependent on the radius of the whisker, the chemical nature of the atmosphere and the pressure. The argon, growth rates in excess of the classical linear law for tip impingement support the model of surface diffusion inhibited by the presence of the inert gas. This inhibited surface diffusion is the rate-controlling process. The addition of the active element oxygen increases the number of whiskers and dendritic growth while decreasing the growth rates of whiskers. This decrease is proportional to the partial pressure of oxygen, but the effect seems to be less than that suggested in the previous literature. At the lower supersaturations, growth habits other than whiskers become dominant with small platelets comprising the primary habit at the lowest supersaturation. The effect of a different inert gas was investigated by the substitution of helium for argon.
Published Version
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