Superstrength of ultrafine-grained aluminum alloys produced by severe plastic deformation

Valiev, Ruslan Z.; Enikeev, Nariman A.; Murashkin, M. Yu.; Александров, С. Е.; Gol'Dshtein, R. V.

doi:10.1134/s1028335810060054

Cited by 34 publications

(32 citation statements)

References 10 publications

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“…At the same time, Hall-Petch relationship breakdown is not observed in ultrafine-grained materials with a mean grain size of 100-1000 nm produced by SPD processing. Moreover, recently it was shown that UFG alloys can exhibit a considerably higher strength than the Hall-Petch relationship predicts for the range of ultrafine grains [12][13][14][15]. The nature of such superstrength may be associated with another nanostructural features (dislocation substructures, nanophase particles and segregations, nanotwins, etc.)…”

Section: Superstrength and Ductilitymentioning

confidence: 94%

“…This issue was recently studied in detail for the case of superstrong UFG Al alloys, namely AA1570 and AA7475 [12,13]. for Ni: the continuous line is for material states with grains without substructure, and the dashed line is for nanostructured Ni containing a dislocation substructure [16][17][18][19] The transmission electron microscopy (TEM) analysis demonstrated that HPT leads to a complete transformation of the initial coarse-grained structure of the alloys into the UFG structure.…”

Section: Superstrength and Ductilitymentioning

confidence: 99%

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Multifunctional Properties of Bulk Nanostructured Metallic Materials

Sabirov

Enikeev

Murashkin

et al. 2015

Bulk Nanostructured Materials With Multifunctional Properties

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This chapter focuses on multifunctional properties of bulk nanostructured metallic materials and structure-properties relationship therein. The most important structural factors affecting mechanical, physical, and chemical properties of the nanomaterials are discussed, and the strategies to their further improvement are outlined. Special attention is paid to nanostructural design for simultaneous improvement of mutually exclusive properties. Superstrength and Enhanced Mechanical PropertiesAlthough the mechanical and functional properties of all polycrystalline metallic materials are determined by several factors, the grain size of the material generally plays the most significant and often a dominant role. Thus, the strength of different polycrystalline materials is related to the grain size, d, through the Hall-Petch equation which states that the yield stress, σ y , is given bywhere σ o is termed the friction stress and k y the Hall-Petch constant [1,2]. It follows from Eq. 3.1 that the strength increases with a reduction in the grain size and this has led to an ever-increasing interest in fabricating materials with extremely small grain sizes. The fabrication of bulk samples and billets using equal channel angular pressing (ECAP), high pressure torsion (HPT), and other severe plastic deformation (SPD) techniques was a crucial first step in initiating investigations into the properties of bulk nanomaterials because the use of SPD processing permitted, and subsequently fully supported, a series of systematic studies using various nanostructured metallic materials including commercial alloys [3][4][5][6][7][8]

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Section: Superstrength and Ductilitymentioning

confidence: 94%

Section: Superstrength and Ductilitymentioning

confidence: 99%

Multifunctional Properties of Bulk Nanostructured Metallic Materials

Sabirov

Enikeev

Murashkin

et al. 2015

Bulk Nanostructured Materials With Multifunctional Properties

Self Cite

View full text Add to dashboard Cite

show abstract

“…It was also determined that HPT processing has an observable effect on the value of the crystal lattice parameter α of Al alloys. For example, in the AA1570, its value after straining was reduced considerably in comparison with the initial state, from 4.0765 ± 0.0001 Å to 4.0692 ± 0.0003 Å, which results from the formation of Mg segregations at grain boundaries [26,31]. [26].…”

Section: Superstrength and Hardening Mechanismsmentioning

confidence: 99%

“…At the same time, HallPetch relationship breakdown is not observed in ultrafine-grained materials with a mean grain size of 100-1000 nm produced by SPD processing. Moreover, recently it was shown that UFG alloys can exhibit a considerably higher strength than the Hall-Petch relationship predict for the range of ultrafine grains [26,[31][32][33]. The nature of such superstrength was recently studied in detail for the case of superstrong Al alloys, namely AA1570 and AA7475 [26,31] as well as stainless steel [34] subjected to severe plastic deformation by HPT processing.…”

Section: Superstrength and Hardening Mechanismsmentioning

confidence: 99%

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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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