Ultrafine-grained Al–5 wt.% Fe alloy processed by ECAP with backpressure

Stolyarov, V. V.; Lapovok, Rimma; Бродова, И. Г.; Thomson, Peter Frederic

doi:10.1016/s0921-5093(03)00215-6

Cited by 184 publications

(90 citation statements)

References 4 publications

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“…It is well known that second-phase precipitates can be broken up by the ECAP process, 5,14) as was also found in this study. On the other hand, few precipitates were observed in the oxide films of anodized Al-Mg alloy (Impurity-free) [(e), (f)].…”

Section: Methodssupporting

confidence: 83%

Effect of Annealing on the Pitting Corrosion Resistance of Anodized Aluminum-Magnesium Alloy Processed by Severe Plastic Deformation

et al. 2008

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The effect of annealing on the pitting corrosion resistance of anodized Al-Mg alloy processed by equal-channel angular pressing (ECAP) was investigated by electrochemical techniques in a solution containing 0.2 molÁL À1 of AlCl 3 and also by surface analysis. The degree of internal stress generated in anodic oxide films during anodization was evaluated with a strain gauge. The ECAP decreased the pitting corrosion resistance of anodized Al-Mg alloy. However, the pitting corrosion resistance was improved by annealing after the ECAP. The internal stress present in the anodic oxide films was compressive, and the stress was higher in the alloys with ECAP than without. The compressive internal stress gradually decreased with increasing annealing temperature. Cracks occurred in the anodic oxide film on Al-Mg alloy during initial corrosion. The ECAP produces high internal stresses in the Al-Mg alloy; the stresses remain in the anodic oxide films, increasing the likelihood of cracks. It is assumed that the pitting corrosion is promoted by these cracks as a result of the higher internal stress resulting from the ECAP. The improvement in the pitting corrosion resistance of anodized Al-Mg alloy by annealing appears to be attributable to a decrease in the internal stresses in anodic oxide films.

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Section: Methodssupporting

confidence: 83%

Effect of Annealing on the Pitting Corrosion Resistance of Anodized Aluminum-Magnesium Alloy Processed by Severe Plastic Deformation

et al. 2008

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“…New data was obtained by performing ECAP on Al-1050, Al-Zr and Al-Zr-Si-Fe alloys and HPT on Al-2024 and Al-3Mg-0.2Mn, TEM and SEM micrographs for several alloys processed by ECAP and HPT are presented in Figs 6-8. Grain size data for a range of other commercial and experimental alloys was obtained from [30,35,36,73,74,75,76,77,78]. The database contains a total of 21 alloys, in a total of 37 alloy-processing combinations, with strains ranging from 1 to 17 and with resulting grain sizes between 2 μm and 50 nm, the full database is presented at [79].…”

Section: Results and Analysis: Grain Size During Spdmentioning

confidence: 99%

“…Al-Mg alloys (Mg contents between 3 and 6%) achieve grain sizes that are much finer, at about 100nm. Also the presence of intermetallic particles has been shown to cause enhanced grain refinement [36]. Both dissolved Mg and undissolved intermetallic particles are known to enhance dislocation generation during plastic deformation [21,48].…”

Section: General Model Structure and Main Assumptionsmentioning

confidence: 99%

“…The volume fractions of these intermetallic phases can be estimated from thermodynamic data (phase diagrams and thermodynamic prediction software). This has been applied throughout this work, with the exception of the Al-5Fe alloys, where the high density of Fe containing intermetallics was determined from TEM data in [36]; and for the Al-1050 alloy for which f was estimated on the basis of a linear dependency on (Fe+Si) content (in wt%) from data [115]. (Analysis has shown that the intermetallic particles in these alloys are predominantly β-AlFeSi (Al 5 FeSi) and α-AlFeSi (Al 8 Fe 2 Si) [115]).…”

Section: Appendix: Determination Of Volume Fraction and Sizes Of Non-mentioning

confidence: 99%

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Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

et al. 2009

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The grain refinement during severe plastic deformation (SPD) is predicted using volume averaged amount of dislocations generated. The model incorporates a new expansion of a model for hardening in the parabolic hardening regime, in which the work hardening depends on the effective dislocation free path related to the presence of non shearable particles and solute-solute nearest neighbour interactions.These two mechanisms give rise to dislocation multiplication in the form of generation of geometrically necessary dislocations and dislocations induced by local bond energies. The model predicts the volume averaged amount of dislocations generated and considers that they distribute to create cell walls and move to existing cell walls/grain boundaries where they increase in the grain boundary misorientation. The model predicts grain sizes of Al alloys subjected to SPD over 2 orders of magnitude. The model correctly predicts the considerable influence of Mg content and content of nonshearable particles on the grain refinement during SPD.

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“…A particular cry stall ographic texture is formed in ECAP samples [248]. It has been demonstrated that ECAP can successfully produce numerous submicron-grained metallic materials including Ni [249], Cu [250,251], Fe-Cu alloy [252], Ti alloy [253], Al and its alloys [250,[254][255][256][257][258][259][260][261]. The submicronsized grains of Al and its alloys processed by ECAP are generally unstable at temperatures above $500 K except when the precipitates are present.…”

Section: Severe Plastic Deformationmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

837

345

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In recent years, near-nano (submicron) and nanostructured materials have attracted increasingly more attention from the materials community. Nanocrystalline materials are characterized by a microstructural length or grain size of up to about 100 nm. Materials having grain size of $0.1 to 0.3 mm are classified as submicron materials. Nanocrystalline materials exhibit various shapes or forms, and possess unique chemical, physical or mechanical properties. When the grain size is below a critical value ($10-20 nm), more than 50 vol.% of atoms is associated with grain boundaries or interfacial boundaries. In this respect, dislocation pile-ups cannot form, and the Hall-Petch relationship for conventional coarse-grained materials is no longer valid. Therefore, grain boundaries play a major role in the deformation of nanocrystalline materials. Nanocrystalline materials exhibit creep and super plasticity at lower temperatures than conventional micro-grained counterparts. Similarly, plastic deformation of nanocrystalline coatings is considered to be associated with grain boundary sliding assisted by grain boundary diffusion or rotation. In this review paper, current developments in fabrication, microstructure, physical and mechanical properties of nanocrystalline materials and coatings will be addressed. Particular attention is paid to the properties of transition metal nitride nanocrystalline films formed by ion beam assisted deposition process. #

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Ultrafine-grained Al–5 wt.% Fe alloy processed by ECAP with backpressure

Cited by 184 publications

References 4 publications

Effect of Annealing on the Pitting Corrosion Resistance of Anodized Aluminum-Magnesium Alloy Processed by Severe Plastic Deformation

Effect of Annealing on the Pitting Corrosion Resistance of Anodized Aluminum-Magnesium Alloy Processed by Severe Plastic Deformation

Predicting grain refinement by cold severe plastic deformation in alloys using volume averaged dislocation generation

Nanocrystalline materials and coatings

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