Temperature Behavior of the Viscosity of Quasi Crystal-Forming Al–Cu–Fe Meltsстатья
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Дата последнего поиска статьи во внешних источниках: 6 мая 2019 г.
Аннотация:We have studied the temperature and the temporal dependences of the viscosity of quasi crystalforming
Al–Cu–Fe melts within the range of i-phase (Al62Cu25.5Fe12.5) stoichiometry with a change in the
concentration of copper from 15.5 to 35.5 at % and in that of iron from 2.5 to 22 at % as well as within the
concentration range in which the i-phase is the first to arise from the Al59.5 + xCu35.5 – xFe5 melt (x = 0–15). We show
for the studied alloys that prolonged (2 h or longer) relaxation processes take place directly after melting in the conditions
of the viscosimetric experiment and that they should be taken into account when the temperature dependences
of the viscosity are measured. In the equilibrium thermodynamic conditions, the viscosity polytherms coincide
for the heating and the cooling regimes; they are monotonous and are well described by the exponential dependence.
The activation energy of the viscous flow, depending on the composition, varies from 18 to 36 kJ/mol