The work is devoted to the study of changes in the structural and physical properties of the precipitation-hardened CuCrZr alloy under the influence of low-temperature (77 K) quasihydroextrusion with various degrees of deformation at liquid nitrogen temperature with subsequent aging. Prior to quasihydroextrusion, commercial alloy samples were annealed and quenched from the premelting temperature to obtain a supersaturated solid solution of alloying elements in the copper matrix. After quasihydroextrusion, the microstructure, lattice constant, pole densities, tensile strength and yield strength, microhardness (in different cross-sections of the extrudate), and electrical conductivity of the CuCrZr alloy were studied depending on the degree of deformation by quasihydroextrusion. It is shown that the deformation degree determines the kinetics of decomposition of the supersaturated solid solution and its structure. As a result of extrusion, an anisotropic structure of the matrix and precipitates is formed, which also determines the anisotropy of material properties. Subsequent aging leads to a significant decrease in the anisotropy of properties. With an increase in the deformation degree during extrusion (before aging), a significant monotonous increase in physical and mechanical properties occurs. However, in the range of deformation degrees of 40–50%, an anomalous “jump” of all measured properties and structural parameters is observed. The study proposes a physical mechanism that explains the experimental results. The mechanism is based on the occurrence of two kinetically differently directed processes: dynamic aging and its inhibition due to an increase in the defectiveness of the material. The latter process manifests itself essentially at low temperatures. In general, low-temperature quasihydroextrusion makes it possible to obtain a complex of sufficiently high mechanical and electrical characteristics of the CuCrZr alloy at relatively low degrees of deformation for one extrusion cycle, which is facilitated by low deformation temperature.
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February 2023
Research Article|
February 01 2023
Effect of low-temperature quasihydroextrusion on the structure and physical properties of CuCrZr alloy
A. I. Belyaeva;
A. I. Belyaeva
1
National Technical University “Kharkiv Polytechnic Institute”
, Kharkiv 61002, Ukraine
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P. A. Khaimovich;
P. A. Khaimovich
2
National Scientific Center “Kharkiv Institute of Physics and Technology”
, Kharkiv 61108, Ukraine
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A. A. Galuza
;
A. A. Galuza
a)
1
National Technical University “Kharkiv Polytechnic Institute”
, Kharkiv 61002, Ukraine
3
Kharkiv National University of Radio Electronics
, Kharkiv 61166, Ukraine
a)Author to whom correspondence should be addressed: [email protected]
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I. V. Kolenov
;
I. V. Kolenov
4
Institute of Electrophysics & Radiation Technologies of NAS of Ukraine
, Kharkiv 61002, Ukraine
5
O. Ya. Usikov Institute for Radiophysics and Electronics of NAS of Ukraine
, Kharkiv 61085, Ukraine
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A. A. Savchenko
A. A. Savchenko
1
National Technical University “Kharkiv Polytechnic Institute”
, Kharkiv 61002, Ukraine
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a)Author to whom correspondence should be addressed: [email protected]
Fiz. Nizk. Temp. 49, 257–267 (February 2023)
Low Temp. Phys. 49, 238–247 (2023)
Article history
Received:
December 23 2022
Citation
A. I. Belyaeva, P. A. Khaimovich, A. A. Galuza, I. V. Kolenov, A. A. Savchenko; Effect of low-temperature quasihydroextrusion on the structure and physical properties of CuCrZr alloy. Low Temp. Phys. 1 February 2023; 49 (2): 238–247. https://doi.org/10.1063/10.0016851
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