Premium
Thermodynamische Analyse der Erweiterung der Feststofflöslichkeit in einem durch mechanisches Legieren hergestellten nicht mischbaren Kupfer‐Blei‐System
Author(s) -
Wu Z.F.,
Xie T.,
Wu J.,
Zhang L.
Publication year - 2021
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201900199
Subject(s) - solid solution , nanocrystalline material , copper , solubility , materials science , alloy , gibbs free energy , crystallite , thermodynamics , metallurgy , chemistry , nanotechnology , physics
X‐ray diffraction analysis, scanning electron microscopy and thermodynamic calculations in the Miedema's model were used to study the extension of solid solubility in copper‐lead immiscible system prepared by mechanical alloying. The result shows that the nanocrystalline supersaturated solid solution formed during the alloying process. The Gibbs free energy change in this system during the formation of solid solution is calculated and shows to be positive, which means that a thermodynamic barrier exists for the formation of this alloy system in solid state. It has been found that the additional energy stored in nanocrystalline copper‐lead alloy during the alloying process as a result of crystallite size reduction and increased dislocation density, would be high enough to overcome the thermodynamic barrier in the formation of a solid solution.