Structure evolution and stability of copper deformed at 80 K

Воронова, Л. М.; Чащухина, Т. И.; Degtyarev, M. V.; Pilyugin, V. P.

doi:10.1134/s0036029512040131

Cited by 9 publications

(5 citation statements)

References 4 publications

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“…The latter is identical to that found by Voronova et al [14] whereas the former is significantly lower.…”

Section: Ceptsupporting

confidence: 87%

“…EDX measurements carried out on samples in the CePt 5 ePt two-phase field show no trace of cerium in the Pt grains. Within the limits of this technique, we conclude that Ce does not substitute for Pt in the structure of pure platinum up to 1000 C. Note that Voronova et al [14] reported a small solubility, below 1 at.%. The absence of solubility, or its very low value, is likely due to the difference in atomic radius: 1.85 Å for Ce and 1.35 Å for Pt [32].…”

Section: The Pt Solid Solutionmentioning

confidence: 88%

“…In the assessed diagram, the solideliquid equilibria and the stability of the reported compounds are still speculative. The only available thermodynamic data are due to Vronova et al [14] who measured the temperature of the eutectic plateau, liquid 4 CePt 5 þ (Pt), at 1575 C and estimated the eutectic composition at 92 at.% Pt.…”

Section: Introductionmentioning

confidence: 99%

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The phase diagram of the Ce–Pt system

et al. 2010

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“…The latter is identical to that found by Voronova et al [14] whereas the former is significantly lower.…”

Section: Ceptsupporting

confidence: 87%

Section: The Pt Solid Solutionmentioning

confidence: 88%

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The phase diagram of the Ce–Pt system

et al. 2010

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“…S4 of Supplementary Information). The grains were formed during the heating of the material up to room temperature [19]. The simultaneous presence of all these structural components after the deformation in the investigated range, as well as rapid grain growth at 300 K, did not allow us to reveal the stages of deformation.…”

Section: Resultsmentioning

confidence: 93%

“…In the first case, deformation twins that form in a coarsegrained material are considered, and the latter mechanism (zero-macrostrain deformation twinning) is typical of nanocrystalline materials [17,18]. It was found in [19] that there were no signs of recrystallization upon heating to room temperature in the regions occupied by deformation twins of the first type in high-purity copper subjected to cryogenic HPT, but the formation of microcrystallites caused a rapid development of recrystallization in the bulk of the material. The aim of this work was to study the formation of an ultrafine-grained structure and its subsequent roomtemperature recrystallization in commercial copper, where twinning took place upon cryogenic deformation performed by HPT.…”

Section: Introductionmentioning

confidence: 99%

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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