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

Korneva, Anna; Straumal, Boris; Kilmametov, Askar; Chulist, Robert; Cios, Grzegorz; Baretzky, Brigitte; Zięba, Paweł

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.

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Verlagsausgabe §
DOI: 10.5445/IR/1000090918
Veröffentlicht am 12.02.2019
Seitenaufrufe: 18
seit 13.02.2019
Downloads: 19
seit 14.02.2019
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 1996-1944
KITopen-ID: 1000090918
HGF-Programm 43.22.01 (POF III, LK 01)
Erschienen in Materials
Band 12
Heft 3
Seiten Article: 447
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 01.02.2019
Schlagworte Cu–Ag alloy; high-pressure torsion; ultrafine microstructure; phase dissolution; microhardness
Nachgewiesen in Scopus
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