Microstructural Features in Multicore Cu–Nb Composites
Abstract
:1. Introduction
2. Materials and Methods
3. Results
4. Conclusions
- (1)
- The axial texture (drawing direction) is formed under the deformation and retained, although it is weakened, in all the annealing temperature ranges studied.
- (2)
- Microstresses and macrostresses in ribbon-like Nb filaments increase with the true strain increasing. The macrostresses result in distortions of the Nb lattice-stretching of (110)Nb interplanar distances along the drawing axis and their compression in the direction perpendicular to it, and these distortions noticeably increase with an increase in strain.
- (3)
- In the copper matrix, a high level of microstresses has also been found, which increases with the true strain increasing. Small macrostresses are also present, which lead to distortions of the Cu lattice, although they are an order of magnitude lower than in Nb.
- (4)
- Under the annealing, coagulation of Nb filaments (their thickening and rounding in cross-sections) occurs. This process begins at 300–400 °C, develops actively at 600 °C, and practically completes at 700 °C. The necking and rupture of Nb filaments under annealing results in the decrease of microhardness.
- (5)
- The thermal stability of Cu–18Nb microcomposites is higher than that of their constituents (Cu and Nb) processed by high-pressure torsion, which may be due to the coherency of Cu/Nb interfaces.
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Sample | e | Wire Section | P111Cu, % | P110Nb, % | FWHM (111)Cu,° | FWHM (110)Nb,° | d110Nb Ǻ | Δd110Nb, % | d111Cu Ǻ | Δd111Cu, % |
---|---|---|---|---|---|---|---|---|---|---|
1 | 10.2 | transverse | 84.0 | 91 | 0.34 | 1.2 | 2.350 | −0.6 | 2.089 | −0.15 |
1 | 10.2 | longitudinal | 2.320 | 0.6 | 2.085 | 0.04 | ||||
2 | 12.5 | transverse | 94.0 | 99 | 0.46 | 1.5 | 2.381 | −2.0 | 2.082 | 0.19 |
2 | 12.5 | longitudinal | 2.289 | 2.0 | 2.088 | −0.10 | ||||
Nbst | - | - | - | 0.5 | 2.335 | - | ||||
Cust | - | - | 0.24 | - | - | 2.086 |
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Popova, E.N.; Deryagina, I.L.; Valova-Zaharevskaya, E.G.; Ruello, M.L.; Popov, V.V., Jr. Microstructural Features in Multicore Cu–Nb Composites. Materials 2021, 14, 7033. https://doi.org/10.3390/ma14227033
Popova EN, Deryagina IL, Valova-Zaharevskaya EG, Ruello ML, Popov VV Jr. Microstructural Features in Multicore Cu–Nb Composites. Materials. 2021; 14(22):7033. https://doi.org/10.3390/ma14227033
Chicago/Turabian StylePopova, Elena N., Irina L. Deryagina, Evgeniya G. Valova-Zaharevskaya, Maria Letizia Ruello, and Vladimir V. Popov, Jr. 2021. "Microstructural Features in Multicore Cu–Nb Composites" Materials 14, no. 22: 7033. https://doi.org/10.3390/ma14227033