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The Role of Interfaces in Evolution of Structure and Thermal Stability of Cu-Nb Composite Processed by High-Pressure Torsion

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Abstract:

The structure and thermal stability of Cu-18Nb multicore composite fabricated by repeated cold-drawing of in situ melted mixture of Cu and Nb and subjected to high-pressure torsion (HPT) have been studied by SEM, TEM, X-ray analysis and microhardness measurements. In the cold-drawn state ribbon-like Nb filaments the thickness of 30-70 nm are located in Cu-matrix with sharp texture <110>_Nb║<111>_Cu║drawing axis. The Nb lattice is distorted, the interplanar spacing (110)_Nb being extended along the drawing axis and compressed perpendicular to it, which testifies a semi-coherent character of Cu/Nb interfaces. At annealing these distorsions gradually vanish, and coagulation of Nb ribbons starts at 400С, actively develops at 600С and finishes at 800С with the formation of sausage-like filaments with round transverse sections, which is accompanied with about two-fold decreasing of microhardness. Under the HPT the composite structure is considerably refined, and almost equiaxed grains the sizes of 20-30 nm are formed, which gives rise to a dramatic increase of microhardness. The thermal stability of Cu-Nb composite after cold drawing and HPT is appreciably higher than that of pure Nb and Cu nanostructured by severe plastic deformation.

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Diffusion in Materials DIMAT-2017

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Defect and Diffusion Forum (Volume 383)

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118-124

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https://doi.org/10.4028/www.scientific.net/DDF.383.118

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Online since:

February 2018

Authors:

E.N. Popova*, I.L. Deryagina, E.G. Valova-Zaharevskaya, Alexey V. Stolbovsky

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High-Pressure Torsion, In Situ Composite, Microhardness, Scanning Electron Microscopy, Thermal Stability, Transmission Electron Microscopy

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