Unusual super-ductility at room temperature in an ultrafine-grained aluminum alloy

Valiev, Ruslan Z.; Murashkin, M. Yu.; Kilmametov, Askar; Straumal, Boris B.; Chinh, Nguyen Q.; Langdon, Terence G.

doi:10.1007/s10853-010-4588-z

Cited by 157 publications

(133 citation statements)

References 34 publications

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“…[27][28][29] Lastly, it has been found recently that a heterogeneous lamellar (HL) Ti with $25 vol.% of recrystallized grains ($4 lm) embedded in a UFG hard matrix has a strain-hardening rate and ductility higher than that of CG Ti with a grain size of 43 lm while maintaining the strength of UFG Ti (Fig. 1).…”

Section: Authors' Notementioning

confidence: 98%

Producing Bulk Ultrafine-Grained Materials by Severe Plastic Deformation: Ten Years Later

Valiev

Estrin

Horita

et al. 2016

JOM

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It is now well established that the processing of bulk solids through the application of severe plastic deformation (SPD) leads to exceptional grain refinement to the submicrometer or nanometer level. Extensive research over the last decade has demonstrated that SPD processing also produces unusual phase transformations and leads to the introduction of a range of nanostructural features, including nonequilibrium grain boundaries, deformation twins, dislocation substructures, vacancy agglomerates, and solute segregation and clustering. These many structural changes provide new opportunities for fine tuning the characteristics of SPD metals to attain major improvements in their physical, mechanical, chemical, and functional properties. This review provides a summary of some of these recent developments. Special emphasis is placed on the use of SPD processing in achieving increased electrical conductivity, superconductivity, and thermoelectricity, an improved hydrogen storage capability, materials for use in biomedical applications, and the fabrication of high-strength metal-matrix nanocomposites.

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Section: Authors' Notementioning

confidence: 98%

Producing Bulk Ultrafine-Grained Materials by Severe Plastic Deformation: Ten Years Later

Valiev

Estrin

Horita

et al. 2016

JOM

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404

186

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“…The best-known Al-Zn alloys, such as eutectic Al-95 wt.% Zn, eutectoid Al-78 wt.% Zn and solid solutions with Zn contents lower than 31.6 wt%, have been extensively studied [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence of SPD, an ultrafine-grained microstructure developed which exhibited unusually high elongations up to 150% and relatively high strain rate sensitivities at room temperature [2]. In addition, the HPT-processed material showed an abnormal softening despite the UFG microstructure.…”

Section: Introductionmentioning

confidence: 99%

Influence of Zn content on the microstructure and mechanical performance of ultrafine-grained Al–Zn alloys processed by high-pressure torsion

et al. 2017

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Cite this article as: Nguyen Q. Chinh, Péter Jenei, Jenő Gubicza, Elena V. Bobruk, Ruslan Z. Valiev and Terence G. Langdon, Influence of Zn content on the microstructure and mechanical performance of ultrafine-grained Al-Zn alloys processed by high-pressure torsion, Materials Letters, http://dx.doi.org/10.1016Letters, http://dx.doi.org/10. /j.matlet.2016 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Keywords: Al-Zn alloys, grain boundaries, indentation, micro-pillars, strain rate sensitivity, ultrafine grains Abstract: Al-Zn alloys were processed by high-pressure torsion (HPT) to produce ultrafine-grained (UFG) materials. For low Zn contents, HPT gave strengthening due to grain refinement while for the highest Zn concentration the decomposition of the microstructure yielded an abnormal softening at room temperature. The microstructure decomposition led also to the formation of a Zn-rich phase which wet the Al/Al grain boundaries and enhanced the role of grain boundary sliding with unusually high strain rate sensitivity. The occurrence of intensive sliding in these UFG alloys is demonstrated by deforming micro-pillars.

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“…Increased strain rate sensitivity was also revealed in a number of other studies [65,80,81]. It was recently demonstrated that the m-value in the UFG Al alloys at room temperature can be increased up to 0.24 via manipulation with the chemical composition of grain boundaries [82] that can lead to the extraordinarily high ductility at room temperature.…”

Section: Ductility and Strategies For Its Improvementmentioning

confidence: 72%

Recent Findings in Superior Strength and Ductility of Ultrafine-Grained Materials

Valiev

Zhu

2015

Trans. Mat. Res. Soc. Japan

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Over the last two decades it was well documented that the formation of ultrafine-grained (UFG) structures with the grain sizes in submicron (< 1 µm) or nanometer (< 100 nm) range in metallic materials increases strength but typically also leads to decrease in ductility. However, recent studies demonstrated that extraordinarily high strength and enhanced ductility can be obtained in the UFG metals and alloys when it is possible to control not only grain sizes but also the formation of various nanostructured elements, such as nanoparticles, nanotwins and grain boundary structures (states) by means of severe plastic deformation (SPD) techniques. These new trends applied to different metallic materials with superior strength and high ductility are considered and discussed in the present paper.

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Unusual super-ductility at room temperature in an ultrafine-grained aluminum alloy

Cited by 157 publications

References 34 publications

Producing Bulk Ultrafine-Grained Materials by Severe Plastic Deformation: Ten Years Later

Producing Bulk Ultrafine-Grained Materials by Severe Plastic Deformation: Ten Years Later

Influence of Zn content on the microstructure and mechanical performance of ultrafine-grained Al–Zn alloys processed by high-pressure torsion

Recent Findings in Superior Strength and Ductility of Ultrafine-Grained Materials

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