Temperature Dependences of the Viscosity of Metals
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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For pure metals three types of given dependences are observed 1 the polytherm has its convex side facing the abscissa, which is probably explained by the weakening of bonds during the thermal expansion of a fluid 2 the curve has its concave side to the abscissa, the activation energy increases with a rise in temperature, which can be caused by an increase in the coordination number, the integral bond energy increases, regardless of the possible weakening of a single bond, this can also take place in the case of intensive metallization of primarily covalent bonds 3 the given linear dependence, the invariability of E with a rise in temperature is probably explained by the compensating effect of several factors.
- Metallurgy and Metallography