Effect of temperature–strain-rate conditions of deformation on structure formation in commercially pure copper deformed in Bridgman anvils

Orlova, D. K.; Чащухина, Т. И.; Воронова, Л. М.; Degtyarev, M. V.

doi:10.1134/s0031918x15090136

Cited by 9 publications

(5 citation statements)

References 14 publications

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“…The HPT enables carrying out continuous deformation of even brittle and hard materials to a very high strain and, in particular, to change the deformation temperature in a wide range. 14,15) In a great number of publications evolution of the structure of various pure metals has been studied under the HPT at elevated temperatures, 16,17) room temperature 1820) and cryogenic (liquid nitrogen) temperature. 2124) In pure metals subjected to SPD the refinement of structure is limited by the dynamic recrystallization and the onset of saturation stage, when the strain increasing does not lead to further refinement of the structure and strengthening of the material.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Nb and Cu–Nb Composites under Severe Plastic Deformation and Annealing

Popov

Попова

2019

Mater. Trans.

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Nowadays potentialities of obtaining bulk nanostructured materials with unique properties by various techniques of severe plastic deformation (SPD) are comprehensively studied, and niobium, being a refractory, but plastic enough metal, is an ideal object for such studies. Besides, niobium is a metal of special interest as an advanced functional material, being one of the main constituents of such important electrotechnical materials as high-strength CuNb composites and multifilamentary Nb 3 Sn-based and NbTi superconductors. The present paper is an overview on evolution of Nb microstructure under SPD via different routes and under large plastic deformation by cold drawing of composite wires (in a Cu matrix). The main attention in this paper is paid to the original studies of the authors (with their coauthors), but the available publications on the topics considered are involved and reviewed as well.

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Section: Introductionmentioning

confidence: 99%

Behavior of Nb and Cu–Nb Composites under Severe Plastic Deformation and Annealing

Popov

Попова

2019

Mater. Trans.

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“…Microhardness of the commercial copper as a function of true strain: (1) 80 K and (2) 300 K (a); stages of the deformation at 80 K: ▲ -I stage, ◊ -II stage (b). Curve 2 was built using the data taken from [9].…”

Section: Resultsmentioning

confidence: 99%

“…Since the size of microcrystallites is about 100 nm, then, according to the data of [18,20], mechanical twinning causing macroscopic deformation has no chance to take place in them. The deformation of commercial copper at room temperature [9] was performed under other conditions. It was accompanied by dynamic recovery and DR without deformation twinning.…”

Section: Resultsmentioning

confidence: 99%

“…Fig. 1a shows the microhardness of the commercial copper deformed at 300 K [9] and 80 K as a function of the true strain. The nonmonotonic dependence obtained after deformation at 300 K can be explained by DR and PDR.…”

Section: Methodsmentioning

confidence: 99%

“…The nonmonotonic dependence obtained after deformation at 300 K can be explained by DR and PDR. These processes result in the formation of a structure with nonuniformly distributed defects and some grown recrystallized grains [9]. After deformation at 80 K, the microhardness increased monotonically over the entire true strain range.…”

Section: Methodsmentioning

confidence: 99%

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Formation and stability of the ultrafine-grained structure of commercial-purity copper deformed at 80 K

Воронова¹,

Degtyarev²,

Чащухина³

et al. 2018

LoM

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The structure and microhardness of commercially pure copper have been studied after cryogenic (80 K) high-pressure torsion performed at an angle of the anvil rotation from 15° to 10 revolutions. The retardation of dynamic softening processes due to impurity dragging allows us to establish the stages of the structural change in commercially pure copper upon deformation, as compared to high-purity copper, in which recrystallization rapidly develops upon heating to room temperature, significantly distorting the deformed structure and decreasing the microhardness of the deformed copper. Two stages of deformation have been observed. The stages change at a true strain of e = 7.3. Dislocation slip and mechanical twinning are the main structureforming mechanisms at the first stage. No mechanical twins are found at the second stage. The second stage is characterized by misoriented microcrystallites which play the role of recrystallization centers upon heating up to room temperature. The average microcrystallite size is 0.1-0.2 μm. Microcrystallites provide a low thermal stability of the structure. Some grains in the structure formed at the second stage of deformation can grow up to several microns in 1-2 days; the fraction of the recrystallized structure is 20 %. Holding for 3 years almost completes the recrystallization; the maximum size of recrystallized grains is 100 μm. Recrystallization at room temperature develops slowly in the structure with deformation twins: the early signs of recrystallization are observed 1.5 years later after the end of the deformation; and the fraction of the recrystallized structure does not exceed 10 %.

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Effect of alloying with palladium on the electrical and mechanical properties of copper

Volkov¹,

Новикова²,

Kostina

et al. 2016

Phys. Metals Metallogr.

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Effect of temperature–strain-rate conditions of deformation on structure formation in commercially pure copper deformed in Bridgman anvils

Cited by 9 publications

References 14 publications

Behavior of Nb and Cu–Nb Composites under Severe Plastic Deformation and Annealing

Behavior of Nb and Cu–Nb Composites under Severe Plastic Deformation and Annealing

Formation and stability of the ultrafine-grained structure of commercial-purity copper deformed at 80 K

Effect of alloying with palladium on the electrical and mechanical properties of copper

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