Microstructural and mechanical properties of Al 7075 alloy processed by Equal Channel Angular Pressing

Kumar, Subramanian Ramesh; Gudimetla, Kondaiah; Venkatachalam, Perumal; Ravisankar, B.; Jayasankar, K.

doi:10.1016/j.msea.2011.11.031

Cited by 94 publications

(42 citation statements)

References 28 publications

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“…[6,9] It is significant that also mechanical tests do not always produce consistent data when different routes are compared. For example, in several studies, [36,37] the tensile strength of route Bc samples tested along the ED was found to be higher than that for route A samples after identical numbers of passes. However, other authors reported higher tensile strengths in route A samples compared to samples extruded via route Bc.…”

Section: B Comparison With Bar Samplesmentioning

confidence: 99%

Quantitative Microstructural Characterization of Thick Aluminum Plates Heavily Deformed Using Equal Channel Angular Extrusion

Mishin

Segal

Ferrasse

2012

Metall Mater Trans A

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A detailed quantitative analysis of the microstructure has been performed in three orthogonal planes of 15-mm-thick aluminum plates heavily deformed via two equal channel angular extrusion (ECAE) routes. One route was a conventional route A with no rotation between passes. Another route involved sequential 90 deg rotations about the normal direction (ND) between passes. The microstructure in the center of these plates, and especially the extent of microstructural heterogeneity, has been characterized quantitatively and compared with that in bar samples extruded via either route A or route Bc with 90 deg rotations about the longitudinal axis. Statistically robust data were obtained in this work using gallium enhanced microscopy and EBSD mapping of large sample areas. For the plate processed using route A, the fraction of high-angle boundaries was found to strongly depend on the inspection plane, being smallest in the plane perpendicular to the ND (plane Z), where the largest subgrain size and most profound microstructural heterogeneities were also revealed. In comparison, the plate extruded with 90 deg rotations about the ND was less heterogeneous and contained smaller subgrains in plane Z. Comparing the plate and bar samples, the most refined and least heterogeneous microstructure was observed in the route Bc bar sample. The differences in the microstructure are reflected in the hardness data; the hardness is lowest after ECAE via route A and greatest in the bar sample processed using route Bc.

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Section: B Comparison With Bar Samplesmentioning

confidence: 99%

Quantitative Microstructural Characterization of Thick Aluminum Plates Heavily Deformed Using Equal Channel Angular Extrusion

Mishin

Segal

Ferrasse

2012

Metall Mater Trans A

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“…Equal channel angular extrusion (ECAE), also called equal channel angular pressing (ECAP) has been used to produce ultrafine-grained materials [10][11][12]. ECAP is a convenient forming procedure to extrude material by the use of specially designed channel dies without a substantial change in geometry [13].…”

Section: Equal Channel Angular Extrusion (Ecae) Processmentioning

confidence: 99%

“…The properties of materials processed by ECAP are strongly dependent on the plastic deformation behavior during pressing [16,24]. These properties are governed mainly by the inner die angle ∅ and outer die angle y, the material properties like strength and hardening behavior [11], and process variables such as lubrication and deformation speed [25].…”

Section: Equal Channel Angular Extrusion (Ecae) Processmentioning

confidence: 99%

Equal Channel Angular Extrusion Characteristics on Mechanical Behavior of Aluminum Alloy

Abioye¹,

Fayomi²,

Popoola³

et al. 2017

Aluminium Alloys - Recent Trends in Processing, Characterization, Mechanical Behavior and Applications

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Materials strengthened by conventional methods such as strain hardening, solute additions, precipitation and grain size refinement are often adopted in industrial processes. But there is limitation to the amount of deformation that these conventional methods can impact to a material. This study focused on the review of major mechanical properties of aluminum alloys in the presence of an ultrafine grain size into polycrystalline materials by subjecting the metal to an intense plastic straining through simple shear without any corresponding change in the cross-sectional dimensions of the sample. The effect of the heavy strain rate on the microstructure of aluminum alloys was in refinement of the coarse grains into ultrafine grain size by introducing a high density of dislocations and subsequently re-arranging the dislocations to form an array of grain boundaries. Hence, this investigation is aimed at gathering contributions on the influence of equal channel angular extrusion toward improving the mechanical properties of the aluminum alloys through intense plastic strain.

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“…Among the mostly investigated SPD methods is equal channel angular pressing (ECAP), the amount of the simple shear strain imposed by which depends primarily on processing parameters, such as material characteristics, friction, processing temperature, die geometry, and the selected deformation route [18][19][20][21][22][23]. Lenka Nevertheless, uniformity of strain distribution across the cross-section of a processed material after a single ECAP pass can be relatively low [24].…”

Section: Introductionmentioning

confidence: 99%

Natural ageing of aluminium processed by twist channel angular pressing

Kunčická¹,

Kocich²

2017

Fifth International Conference on Advances in Civil, Structural and Mechanical Engineering - CSM 2017

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-The method of twist channel angular pressing (TCAP) was invented with the aim to increase the efficiency of single pass severe plastic deformation (SPD) technologies. The study shows the structure of TCAP-processed aluminium after processing and the changes developed in the structure after a year of natural ageing at room temperature. The grain refinement after a single pass TCAP was very significant due to effectively imposed shear strain; the majority of grains were smaller than 5μm. The grains further showed sub-structure featuring fine precipitates, accumulated dislocations and developed subgrains. Transmission electron microscopy of the one-year-aged samples showed increased precipitation; the precipitates acted as effective obstacles for grain growth and structure recovery. The microscopy results were supplemented with microhardness measurements, the results of which showed a significant hardening for the single pass TCAP, after which the average microhardness increased from 44.6 HV to more than 91 HV.

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Microstructural and mechanical properties of Al 7075 alloy processed by Equal Channel Angular Pressing

Cited by 94 publications

References 28 publications

Quantitative Microstructural Characterization of Thick Aluminum Plates Heavily Deformed Using Equal Channel Angular Extrusion

Quantitative Microstructural Characterization of Thick Aluminum Plates Heavily Deformed Using Equal Channel Angular Extrusion

Equal Channel Angular Extrusion Characteristics on Mechanical Behavior of Aluminum Alloy

Natural ageing of aluminium processed by twist channel angular pressing

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