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Materials 2019, 12(3), 447; https://doi.org/10.3390/ma12030447

Dissolution of Ag Precipitates in the Cu–8wt.%Ag Alloy Deformed by High Pressure Torsion

1
Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymonta Street, 30-059 Krakow, Poland
2
Institute of Solid State Physics and Scientific Center of RAS, Russian Academy of Sciences, Ac. OssipyanStr. 2, 142432 Chernogolovka, Russia
3
Karlsruhe Institute of Technology (KIT), Institute of Nanotechnology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
4
National University of Science and Technology «MISIS», Leniskijprosp. 4, 119049 Moscow, Russia
5
AGH University of Science and Technology, Academic Centre for Materials and Nanotechnology, 30 Mickiewicza Av, 30-059 Krakow, Poland
*
Author to whom correspondence should be addressed.
Received: 10 January 2019 / Revised: 26 January 2019 / Accepted: 29 January 2019 / Published: 1 February 2019
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Abstract

The aim of this work was to study the influence of severe plastic deformation (SPD) on the dissolution of silver particles in Cu–8wt.%Ag alloys. In order to obtain different morphologies of silver particles, samples were annealed at 400, 500 and 600 °C. Subsequently, the material was subjected to high pressure torsion (HPT) at room temperature. By means of scanning and transmission electron microscopy, as well as X-ray diffraction techniques, it was found that during SPD, the dissolution of second phase was strongly affected by the morphology and volume fraction of the precipitates in the initial state. Small, heterogeneous precipitates of irregular shape dissolved more easily than those of large size, round-shaped and uniform composition. It was also found that HPT led to the increase of solubility limit of silver in the copper matrix as the result of dissolution of the second phase. This unusual phase transition is discussed with respect to diffusion activation energy and mixing enthalpy of the alloying elements. View Full-Text
Keywords: Cu–Ag alloy; high-pressure torsion; ultrafine microstructure; phase dissolution; microhardness Cu–Ag alloy; high-pressure torsion; ultrafine microstructure; phase dissolution; microhardness
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Korneva, A.; Straumal, B.; Kilmametov, A.; Chulist, R.; Cios, G.; Baretzky, B.; Zięba, P. Dissolution of Ag Precipitates in the Cu–8wt.%Ag Alloy Deformed by High Pressure Torsion. Materials 2019, 12, 447.

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