Publication

Stress-induced and atomic ordering in 18-carat Au-Cu-Ag alloys

Daniele Mari, Robert Schaller, John Hennig
2009
Conference Papers

Abstract

Atomic ordering and stress-induced ordering (Zener relaxation) were studied in a series of 18-carat (75 wt%) yellow gold alloys (Au-Cu-Ag) by means of isothermal mechanical spectroscopy with a forced torsion pendulum at low frequencies. In the high-temperature solid solution, the Zener peak increases critically according to a Curie-Weiss type law when approaching the transition temperature to the ordered phase from above, then breaks down and disappears as the alloy orders. The two critical temperatures as well as the activation energy for the Zener relaxation are reported for each alloy of the series. The composition dependence of the two ordering phenomena is discussed, including the aspect of phase separation into a copper-rich and silver-rich phase as predicted by the ternary phase diagram. (C) 2009 Elsevier B.V. All rights reserved.

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Daniele Mari, Robert Schaller, John Hennig
2009
Conference Papers

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/2488243b-db2f-4c1d-92cd-89f88d9cd24b

About this result

Related concepts (32)

Curie temperature

In physics and materials science, the Curie temperature (TC), or Curie point, is the temperature above which certain materials lose their permanent magnetic properties, which can (in most cases) be replaced by induced magnetism. The Curie temperature is named after Pierre Curie, who showed that magnetism was lost at a critical temperature. The force of magnetism is determined by the magnetic moment, a dipole moment within an atom which originates from the angular momentum and spin of electrons.

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A phase diagram in physical chemistry, engineering, mineralogy, and materials science is a type of chart used to show conditions (pressure, temperature, volume, etc.) at which thermodynamically distinct phases (such as solid, liquid or gaseous states) occur and coexist at equilibrium. Common components of a phase diagram are lines of equilibrium or phase boundaries, which refer to lines that mark conditions under which multiple phases can coexist at equilibrium. Phase transitions occur along lines of equilibrium.

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