A theoretical and experimental evaluation of repetitive corrugation and straightening: Application to Al–Cu and Al–Cu–Sc alloys

Pandey, S.C.; Joseph, M. A.; Pradeep, M.; Raghavendra, K; Ranganath, V R; Venkateswarlu, K.; Langdon, Terence G.

doi:10.1016/j.msea.2011.11.070

Cited by 34 publications

(10 citation statements)

References 47 publications

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“…El desarrollo de aleaciones ternarias de alta resistencia está siendo motivo de variados estudios desde mediados de la pasada década. En la mayor parte de ellas, su resistencia mecánica se fundamenta en la formación de precipitados binarios y/o ternarios de extrema fineza resistentes a ser cortados por las dislocaciones, lo que confiriere al material un elevado límite de fluencia (Sierpinski and Gryziecki 1999;Varschavsky y Donoso, 2002, Varschavsky y Donoso, 2003Batra et al, 2005;Donoso et al, 2007;Caris et al, 2008;Donoso, 2010;Bahmanpour et al, 2011;El-Danaf et al, 2011;San et al, 2011;Donoso et al, 2012a;Pandey et al, 2012;Donoso et al, 2016;Diánez et al, 2016;Donoso et al, 2017).…”

Section: Introductionunclassified

Influencia de la deformación previa sobre el endurecimiento por precipitación en una aleación de Cu-Ni-Si

2019

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Los efectos de la deformación previa sobre los procesos de precipitación en una aleación de Cu-2,8 Ni-1,4 Si (at.%) fueron estudiados utilizando calorimetría diferencial de barrido (DSC), microscopía electrónica de transmisión (TEM) y medidas de microdureza. Las curvas calorimétricas muestran la presencia de una reacción exotérmica atribuido a la formación de precipitados de δ-Ni2Si en la matriz de cobre, lo cual fue confirmado mediante TEM. Además, sse puede observar que la temperatura del máximo del pico de DSC decrece con el aumento de la deformación previa a los tratamientos de envejecimiento. Las energías de activación calculadas para la precipitación de δ-Ni2Si, mediante el método de Kissinger, resultaron similares a aquellas calculadas mediante una función de Arrhenius, a partir del máximo de endurecimiento de la matriz debido al tratamiento de envejecimiento (saturación de la dureza durante el envejecimiento isotérmico). El análisis de las medidas de microdureza en conjunto con las curvas calorimétricas y las micrografías TEM permiten corroborar, por una parte que la formación de la fase δ-Ni2Si, durante los tratamientos de envejecimiento, son los responsables del endurecimiento de la matriz de cobre, y por otra que la deformación previa al tratamiento de envejecimiento inhibe parcialmente la formación de los precipitados.

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Section: Introductionunclassified

Influencia de la deformación previa sobre el endurecimiento por precipitación en una aleación de Cu-Ni-Si

2019

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“…Severe plastic deformation (SPD) is one of the novel thermo-mechanical processing techniques used for producing ultrafine grain microstructure (UFG) with superior mechanical properties in ferrous and non-ferrous alloy [2]. SPD techniques such as Accumulative roll bonding (ARB) [3][4][5][6][7][8][9], Equal channel angular pressing (ECAP) [10][11][12][13][14][15][16], Multi-axial forging (MAF) [17][18][19][20][21], Repetitive corrugation and straightening (RCS) [22][23][24][25][26][27], High-pressure torsion (HPT) [28][29][30][31][32][33][34], are routinely used for producing ultrafine grain materials; however, the limitations associated with these techniques for largescale products are due to requirement of severe plastic strain of the order of 5 or 6 at ambient or elevated temperatures, expensive tooling, and design difficulties. Hence, they are confined to mainly for producing smalllength scale products.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on Tensile and Fracture Behavior of Al–Mg Alloy Processed Through Cryorolling and Cryo Groove Rolling

Yogesha

Kumar

Joshi

et al. 2016

Metallogr. Microstruct. Anal.

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In the present work, Al-Mg alloy (AA 5052) was subjected to cryorolling followed by post-deformation annealing, in order to investigate its effect on tensile and fracture behavior. The solution-treated Al alloys were cryorolled (CR) and cryo groove rolled to different true strains. The microstructure of the samples (deformed and post-annealed) was characterized by optical microscopy, x-ray diffraction, and TEM to substantiate the mechanisms of grain refinement and its influence on tensile and fracture properties. Fractography of the tensile as well as three-point bending test samples was carried out using a scanning electron microscope (SEM) to reveal the fracture mode. The deformed samples (90% thickness reduction) exhibit significant improvement in strength (291 MPa) and hardness (110 HV) in CR samples and 313 MPa and 122 HV in cryo groove rolled samples, which is due to high dislocation density and grain size reduction. Post-annealing of the deformed samples (90% thickness reduction) led to improvement in its ductility as well as fracture toughness. The cryo groove rolled samples and post-annealed samples have shown better fracture toughness (142 kJ/m 2 ) as compared to cryo rolled samples (29 kJ/m 2 ) due to the relatively larger grain and dimples as observed from TEM and fractography studies.

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“…Numerous techniques for SPD processing are now available. The major methods already established for the fabrication of UFG materials include equal-channel angular pressing (ECAP) [7][8], high-pressure torsion (HPT) [9][10], multi-directional forging [11], twist extrusion [12], cyclic-extrusion-compression [13], reciprocating extrusion [14], repetitive corrugation and straightening (RCS) [15], constrained groove pressing (CGP) [16], cylinder covered compression (CCC) [17], accumulative rollbonding (ARB) [18], friction stir processing (FSP) [19] and submerged friction stir processing (SFSP) [20], severe torsion straining (STS) [21], cyclic closed-die forging (CCDF) [22] and super short multi-pass rolling (SSMR) [23]. All of these procedures are capable of introducing large plastic straining and significant microstructure refinement in bulk crystalline solids.…”

Section: Introductionmentioning

confidence: 99%

Ultrafine-Grained Materials Produced by Severe Plastic Deformation

Elmasry¹,

Abo_Elkhair²

2016

The International Conference on Applied Mechanics and Mechanica

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In recent years, ultrafine-grained materials have attracted increasing interests for their good combinations of high strength and ductility. To prepare these materials, Various SPD processing techniques for refining the structure have been developed. This work highlights the recent achievements and new trends in the production of bulk ultrafinegrained (UFG) materials using severe plastic deformation (SPD). Some of those methods permit grain refinement to a Nanometric level. These methods include, among others, high pressure torsion (HPT), equal channel angular pressing (ECAP) and hydrostatic extrusion (HE). In this work, special attention is given to the principles of the various SPD processing techniques as well as the applications of the ultra-fine grained (UFG) metals.

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A theoretical and experimental evaluation of repetitive corrugation and straightening: Application to Al–Cu and Al–Cu–Sc alloys

Cited by 34 publications

References 47 publications

Influencia de la deformación previa sobre el endurecimiento por precipitación en una aleación de Cu-Ni-Si

Influencia de la deformación previa sobre el endurecimiento por precipitación en una aleación de Cu-Ni-Si

A Comparative Study on Tensile and Fracture Behavior of Al–Mg Alloy Processed Through Cryorolling and Cryo Groove Rolling

Ultrafine-Grained Materials Produced by Severe Plastic Deformation

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