Strain amplitude dependence of internal friction and strength of submicrometre-grained copper

Mulyukov, R. R.; Akhmadeev, N.A.; Valiev, Ruslan Z.; Михайлов, С. Б.

doi:10.1016/0921-5093(93)90400-9

Cited by 23 publications

(11 citation statements)

References 4 publications

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“…[16,17,18] For each specific condition of preparation, an average of eight thin foils were observed to take into account statistical effects. This strain rate lowers billet heating to what are believed to be insignificant levels.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and properties of copper and aluminum alloy 3003 heavily worked by equal channel angular extrusion

Ferrasse

Hartwig

Goforth

et al. 1997

Metall Mater Trans A

274

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A technique invented in the former Soviet Union and recently introduced in the United States, called equal channel angular extrusion (ECAE), produces intense and uniform deformation by simple shear and is applied to 25 ϫ 25 ϫ 152-mm billets of Cu 101 and Al 3003. Microcrystalline structures with a grain size of 0.2 to 0.4 m are created during room-temperature multipass ECAE deformation for true strains lying in the range ε ϭ 2.31 to 9.24. Evidence shows that intense simple shear deformation promotes dynamic or continuous recrystallization by subgrain rotation. The effects of the number of extrusion passes and deformation route for Cu 101, and the deformation route after four passes for Al 3003, are studied. Increasing the number of ECAE passes in Cu 101 causes strength to reach saturation and grain refinement stabilization after four passes (true strain of 4.68), and subgrain misorientation to increase as the number of passes increases. For multipass ECAE with billet orientation constant (route A) or rotated 90 deg between all passes (route B), two levels of structures are created inside the original grains: shear bands (first level) and very fine subgrains (second level) within the shear bands. For a billet rotation of 180 deg between passes (route C), an unusual event is observed. At each even numbered pass, shear bands nearly disappear and only subgrains are present inside the original grains. Route B gives the highest strength, whereas route C produces a more equiaxed and stable microstructure. Subsequent static recrystallization increases the average grain size to 5 to 10 m.

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Section: Methodsmentioning

confidence: 99%

Microstructure and properties of copper and aluminum alloy 3003 heavily worked by equal channel angular extrusion

Ferrasse

Hartwig

Goforth

et al. 1997

Metall Mater Trans A

274

View full text Add to dashboard Cite

show abstract

“…6,7) R. R. Mulyukov et al 8) and Y. Koizumi et al 9,10) reported that ultra-fine grained metals have large internal friction together with high strength, although highstrength materials generally have low damping capacity (internal friction). 11,12) Interesting properties of nano-structured materials are related to the largely increased density of lattice defects such as large angle grain boundaries and dislocations.…”

Section: Introductionmentioning

confidence: 99%

“…11,12) Interesting properties of nano-structured materials are related to the largely increased density of lattice defects such as large angle grain boundaries and dislocations. 6,[8][9][10][13][14][15] However, application of these techniques is limited to relatively low-strength materials. T. L. Brown et al 16) and S. Swaminathan et al 17) proposed a lowcost cutting process for production of nano-structured metals and alloys with very high hardness.…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Properties of High-strength Alloys Severely Deformed by Machining

et al. 2008

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“…1,2) It is also known that nano-structured materials have large internal friction. 3,4) Interesting properties of these materials are related to the largely increased density of lattice defects such as large angle grain boundaries and dislocations. 1,[3][4][5][6][7][8] Severe plastic deformation techniques such as equal channel angular pressing (ECAP), [9][10][11] high pressure torsion (HPT) 12) and accumulative roll-bonding (ARB) 13) have been developed for production of nano-structured materials.…”

Section: Introductionmentioning

confidence: 99%

Microstructures of Cutting Chips of SUS430 and SUS304 Steels, and NCF 750 and 6061-T6 Alloys

et al. 2011

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Microstructures of chip specimens of high-strength materials produced by machining were examined by FE-SEM/EBSP method (an orientation imaging microscopy, OIM). In the ferritic SUS430 (16Cr) steel, the chip specimen with shear strain (γ) of ~7.5 was principally composed of equiaxed submicron grains which were for the most part surrounded by large angle grain boundaries (misorientation, θ ≥15°). A similar microstructure was observed in the chip specimen with γ ≈ 22 of the Inconel X-750 (NCF 750) nickel-base alloy. However, the chip specimen of the austenitic SUS304 (18Cr-8Ni) steel (γ ≈ 14) and that of the 6061-T6 (aluminum) alloy (γ ≈ 10) exhibited principally a deformed microstructure with elongated grains and sub grains separated by small angle (2°≤θ <5°) or medium angle grain boundaries (5°≤θ <15°), although equiaxed submicron grains were partly observed. The chip specimens exhibited very high hardness compared to the original materials except 6061-T6 alloy. The maximum hardness value (609 Hv) was observed in the chip specimen with γ ≈ 22 of the Inconel X-750 alloy. Strong particles with equiaxed submicron grain structure, which can be easily produced by milling of cutting chips of commercial alloys, will be potential strengthener for metal matrix composites.

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Strain amplitude dependence of internal friction and strength of submicrometre-grained copper

Cited by 23 publications

References 4 publications

Microstructure and properties of copper and aluminum alloy 3003 heavily worked by equal channel angular extrusion

Microstructure and properties of copper and aluminum alloy 3003 heavily worked by equal channel angular extrusion

Microstructures and Properties of High-strength Alloys Severely Deformed by Machining

Microstructures of Cutting Chips of SUS430 and SUS304 Steels, and NCF 750 and 6061-T6 Alloys

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