Interfacial Free Energy and Viscosity of Cu(Ag) Solidстатья
Статья опубликована в высокорейтинговом журнале
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Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 4 декабря 2017 г.
Аннотация:We experimented in direct measurements of interfacial free energies in Cu(Ag) solid solutions. The experiments were performed using the modified zero-creep method in situ at high temperatures in a dry H2 + Ar atmosphere. As a result we obtained temperature dependences of the interfacial free energies of Cu(Ag) alloys and their viscosities. The Ag concentrations were up to the solubility limit. In general, the energy decreases when the Ag concentration rises, but the isotherms have singularities. We suggest that the singularities correspond to the surface transitions which were predicted by calculations and confirmed experimentally. The viscosity increases after adding a small amount of silver (up to about 0.5 at. % of Ag). At relatively high concentrations of silver, the viscosity decreases. At concentrations close to the solubility limit, the viscosity of the alloys has non-Arrhenius temperature dependence. We suggest that all these experimental results can be explained by grain-boundary phase transitions