Structure of chromium-zirconium bronze subjected to dynamic channel-angular pressing and aging

Zel’dovich, V. I.; Khomskaya, I. V.; Frolova, N. Yu.; Kheifets, A. E.; Шорохов, Е. В.; Nasonov, P. A.

doi:10.1134/s0031918x13050141

Cited by 20 publications

(9 citation statements)

References 8 publications

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“…DCAP of the alloys increases its microhardness up to 1400 and 1600 MPa, that is 2.3-fold as against the initial one (Fig. 5, curves 1 and 2), which is associated with a significant (from 300 -400 to 0.2 -0.4 μm) structure refinement and partial deformation aging in the process of DCAP [13,14]. Annealing of the deformed Cu-0.21 % Cr-0.20 % Zr alloy at temperatures of 300°C for 1 h (at 400°C for 1 h for the Cu-0.06 % Zr alloy) did not change their microhardness (Fig.…”

Section: Effect Of Annealing Temperature On the Microhardness Of Allomentioning

confidence: 85%

“…As it has been established earlier, after DCAP with n = 3 -4, a fragmented structure consisting of grains and sub-grains with a size of 0.2 -0.4 μm with the internal dislocation structure is formed in the alloys. Nanoparticles of the second-phase with a diameter from 2 to 5 nm are precipitated on the boundaries and inside individual crystallites, which suggests that a partial decomposition of the supersaturated α-solid solution of copper occurs in the process of DCAP [13,14]. Fig.…”

Section: Evolution Of the Microstructure Of Alloys Under Dcap And Annmentioning

confidence: 97%

“…5, curves 2). This behavior is related to the decomposition of the supersaturated α-solid solution of copper [13,14]. An increase in the annealing (aging) temperature to 500 -600°C led to a decrease in the microhardness, which is explained by the development of recrystallization.…”

Section: Effect Of Annealing Temperature On the Microhardness Of Allomentioning

confidence: 99%

“…It is important to emphasize that, in the case of DCAP, the simple shear deformation, which produces the structure upon ECAP, is a high-strain-rate process; moreover, upon DCAP, a high-speed shock-wave compressive strain takes place, which creates an additional source of deformationinduced work hardening. It was previously established that the strength of precipitation-hardenable copper alloys with 0.2 -0.5 wt.% Cr and Zr can be additionally increased by optimizing the temperature-time parameters of postdeformation annealing [1][2][3][4][5]13,14]. The process of solid solution decomposition in Cu-Cr-Zr alloys has been investigated repeatedly [1-4,13 -16].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of Cu5Zr particles precipitation in Cu-Zr and Cu-Cr-Zr alloys subjected to quenching and high strain rate deformation

et al. 2019

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The paper studies the decomposition of a supersaturated solid solution with a precipitate of particles of the copper-zirconium phase in the Cu-0.06 wt.% Zr and Cu-0.21 wt.% Cr-0.20 wt.% Zr alloys in two initial states, i. e. after solid-solution quenching and after high strain rate deformation (10 5 s −1) by the method of dynamic channel-angular pressing (DCAP). It has been shown that the decomposition of the supersaturated solid-solution of zirconium in copper in the quenched micro-alloyed Cu-Zr and low-alloyed Cu-Cr-Zr alloys occurs in two stages. At the first stage, nanoparticles of a metastable copper-zirconium phase are formed. The crystal structure of the nanoparticles is close to the structure of the copper matrix. At the second stage, particles of the equilibrium Cu 5 Zr phase are formed in the form of rods. Annealing (aging) of the alloys deformed by DCAP is characterized by the predominance of heterogeneous precipitation of Cu 5 Zr nanoparticles at sub-grain boundaries and dislocations, and the decomposition begins at a lower temperature. The particle size is less by an order of magnitude than that in the quenched state. The precipitation of nanoparticles at dislocations retards the formation of recrystallization centers. It has been shown that the treatment including DCAP and annealing at 450°C for 1 h substantially increases microhardness of the micro-alloyed Cu-0.06 %Zr alloy by a factor of 2.7 as compared to the initial quenched state. This behavior is related to substantial structure refinement during DCAP and decomposition of the supersaturated α-solid solution of copper.

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Section: Effect Of Annealing Temperature On the Microhardness Of Allomentioning

confidence: 85%

Section: Evolution Of the Microstructure Of Alloys Under Dcap And Annmentioning

confidence: 97%

Section: Effect Of Annealing Temperature On the Microhardness Of Allomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Investigation of Cu5Zr particles precipitation in Cu-Zr and Cu-Cr-Zr alloys subjected to quenching and high strain rate deformation

et al. 2019

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“…Annealing at temperatures of 400 -450°C results in a further decomposition of the supersaturated α-solid solution of copper. A previously carried out analysis of the data obtained by dark-field, diffraction, and crystallographic studies of the low-alloyed Cu-0.09 Cr-0.08 Zr, Cu-0.14 Cr-0.04 Zr alloys [16,17] and microalloyed Cu-0.06 Zr alloy [18] showed that a precipitation of 350 -400°C. The Cu 5 Zr nanoparticles (shown by arrows in Fig.…”

Section: Evolution Of the Structure Of Alloys Under Dcap And Agingmentioning

confidence: 99%

The formation of friction-induced nanocrystalline structure in submicrocrystalline Cu–Cr–Zr alloy рrocessed by DCAP

Khomskaya¹,

Kheifets²,

Zel’dovich³

et al. 2018

LoM

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The paper studies the effect of high strain rate (10 5 s −1) deformation by the method of dynamic channel-angular pressing (DCAP), annealing and quasi-static severe plastic deformation (SPD) under sliding friction on the evolution of the structure and properties of low-alloyed dispersion-hardened Cu-Cr-Zr alloys. It is shown that alloying of copper with chromium (0.09-0.14 %) and zirconium (0.04-0.08 %) microadditives changes mechanisms of submicrocrystalline (SMC) structure formation and elastic energy relaxation during DCAP: the cyclic character of structure formation associated with alternating of high-rate processes of fragmentation and dynamic recrystallization is changed to processes of fragmentation and partial strain aging resulting in precipitation of nanosized particles of the second-phase. The temperature-time regime of annealing (aging) of Cu-Cr-Zr SMC alloys processed by DCAP was established to improve the mechanical properties and electrical conductivity. In particular, for Cu-0.14 Cr-0.04 Zr SMC alloy it was shown that the optimal combination of microhardness (HV = 1880 MPa), electrical conductivity (80 % IACS), strength (σ 0.2 = 464 MPa, σ u = 542 MPa) and ductility (δ = 11 %) can be obtained by DCAP and aging at 400°C for 1 h. The improved mechanical properties of the alloys as compared to copper are associated with extra hardening caused by precipitation of Cu 5 Zr and Cr nanoparticles (5-10 nm) in the process of DCAP and aging. It was shown that low-alloyed Cu-Cr-Zr alloys possessed a high work-hardenability due to the methods of DCAP and SPD under sliding friction. By the example of Cu-0.09 Cr-0.08 Zr alloy it was established that the wear rate of samples with SMC structure obtained by the DCAP method decreased by a factor of 1.4 as compared to the coarse-grained state. It was also established that the combination of the treatment by DCAP, aging at 400°С, and SPD under friction of the alloy resulted in the formation of the friction-induced nanocrystalline structure with the grain size of 15-60 nm in the surface-layer material, which provided a high level of microhardness (3350 MPa) and low values of the friction coefficient (0.35).

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Microstructure and Properties of Cu – Cr – Zr Alloys After Plastic Deformation and Aging

Bodyakova,

Mishnev,

Kaibyshev

2024

Met Sci Heat Treat

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Structure of chromium-zirconium bronze subjected to dynamic channel-angular pressing and aging

Cited by 20 publications

References 8 publications

Investigation of Cu5Zr particles precipitation in Cu-Zr and Cu-Cr-Zr alloys subjected to quenching and high strain rate deformation

Investigation of Cu5Zr particles precipitation in Cu-Zr and Cu-Cr-Zr alloys subjected to quenching and high strain rate deformation

The formation of friction-induced nanocrystalline structure in submicrocrystalline Cu–Cr–Zr alloy рrocessed by DCAP

Microstructure and Properties of Cu – Cr – Zr Alloys After Plastic Deformation and Aging

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