Phase transformations in a Cu−Cr alloy induced by high pressure torsion

Journal Article · Fri Apr 15 00:00:00 EDT 2016 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2016.02.017· OSTI ID:22587134

Korneva, Anna ^[1]; Straumal, Boris ^[2]; Kilmametov, Askar ^[3]; Chulist, Robert ^[1]; Straumal, Piotr ^[4]; Zięba, Paweł ^[1]

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1. Institute of Metallurgy and Materials Science, Polish Academy of Sciences, Reymonta St. 25, 30-059 Cracow (Poland)
2. Institute of Solid State Physics, Russian Academy of Sciences, Ac. Ossipzn Str. 2, Chernogolovka 142432 (Russian Federation)
3. Institut für Nanotechnologie, Karlsruher Institut für Technologie, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen (Germany)
4. Laboratory of Hybrid Nanomaterials, National University of Science and Technology «MISIS», Leninskii prosp. 4, 119049 Moscow (Russian Federation)

Phase transformations induced by high pressure torsion (HPT) at room temperature in two samples of the Cu-0.86 at.% Cr alloy, pre-annealed at 550 °C and 1000 °C, were studied in order to obtain two different initial states for the HPT procedure. Observation of microstructure of the samples before HPT revealed that the sample annealed at 550 °C contained two types of Cr precipitates in the Cu matrix: large particles (size about 500 nm) and small ones (size about 70 nm). The sample annealed at 1000 °C showed only a little fraction of Cr precipitates (size about 2 μm). The subsequent HPT process resulted in the partial dissolution of Cr precipitates in the first sample and dissolution of Cr precipitates with simultaneous decomposition of the supersaturated solid solution in another. However, the resulting microstructure of the samples after HPT was very similar from the standpoint of grain size, phase composition, texture analysis and hardness measurements. - Highlights: • Cu−Cr alloy with two different initial states was deformed by HPT. • Phase transformations in the deformed materials were studied. • SEM, TEM and X-ray diffraction techniques were used for microstructure analysis. • HPT leads to formation the same microstructure independent of the initial state.

• OSTI ID: 22587134
• Journal Information: Materials Characterization, Vol. 114; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
77 NANOSCIENCE AND NANOTECHNOLOGY
ALLOYS
ANNEALING
DECOMPOSITION
GRAIN SIZE
MICROHARDNESS
PARTICLE SIZE
PHASE TRANSFORMATIONS
PRECIPITATION
SCANNING ELECTRON MICROSCOPY
SOLID SOLUTIONS
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
TRANSMISSION ELECTRON MICROSCOPY
X-RAY DIFFRACTION