Effect of the initial ECAP passes on crystal texture and residual stresses of 5083 aluminum alloy

Romero-Reséndiz, L.; Flores-Rivera, A.; Figueroa, I.A.; Braham, C.; Reyes-Ruiz, Carlos; Alfonso, I.; González, G.

doi:10.1007/s12613-020-2017-0

Cited by 8 publications

(3 citation statements)

References 27 publications

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“…It is well known that the reduction in grain sizes in metals and metal alloys has an effect on increasing the mechanical strength without decreasing the ductility properties as in the case of work hardening [8][9][10]. This advantage is of great interest in manufacturing metals and metal alloys with an extremely ne grain size [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Equal Channel Angular Pressing on the Properties of Rolled Commercial Purity A1100 Aluminum

boussaada

Mebarek²,

Bouasla³

et al. 2022

Preprint

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Commercial grade A1100 aluminum specimens, widely used in deep drawing, is subjected to rolling followed by severe plastic deformation by Equal Channel Angular Pressing (ECAP). The ECAP die is designed and built in 42CrMo4 steel, hyper-hardened. It has a bent channel with an internal angle 𝜑=115° and an external angle ψ = 8°. The used deformation paths are the conventional route A as well as a non-conventional route noted Ci. The ECAP process is carried out at room temperature. The lowering speed of the movable crosshead of the press is 0.5 mm/s. The rolled and then extruded aluminum properties are studied by means of micro-hardness measurements, tensile tests and X-ray diffraction. Hardening is observed from the first pass, for both routes. The ultimate tensile strength presents a small variation for route A and decrease for route Ci. The elongation to failure increase for both A and Ci routes. The average grain diameter is on the order of 2,9µm after rolling and 1,3 µm after ECAP process in one pass.

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Section: Introductionmentioning

confidence: 99%

Effect of Equal Channel Angular Pressing on the Properties of Rolled Commercial Purity A1100 Aluminum

boussaada

Mebarek²,

Bouasla³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Over the past decades, severe plastic deformation (SPD) has attracted lots of attentions and developed rapidly to obtain ultra-fine or even nanocrystalline grains [5][6][7]. The popular SPD techniques include equal channel angular extrusion (ECAP) [8][9][10][11], high pressure torsion (HPT) [12][13], cumulative rolling (ARB) [14][15], and multi-directional compression (MAC) [16][17]. However, these methods failed to realize industrialized production owing to the high cost, low production efficiency, and discontinuous or unsuitable for fabrication of large components.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, mechanical properties and deformation mechanisms of an Al-Mg alloy processed by the cyclical continuous expanded extrusion and drawing approach

Zhang

Zheng

et al. 2021

Int J Miner Metall Mater

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Al-Mg alloys are an important class of non-heat treatable alloys in which Mg solute and grain size play essential role in their mechanical properties and plastic deformation behaviors. In this work, a cyclical continuous expanded extrusion and drawing (CCEED) process was proposed and implemented on an Al-3Mg alloy to introduce large plastic deformation. The results showed that the continuous expanded extrusion mainly improved the ductility, while the cold drawing enhanced the strength of the alloy. With the increased processing CCEED passes, the multi-pass cross shear deformation mechanism progressively improved the homogeneity of the hardness distributions and refined grain size. Continuous dynamic recrystallization played an important role in the grain refinement of the processed Al-3Mg alloy rods. Besides, the microstructural evolution was basically influenced by the special thermomechanical deformation conditions during the CCEED process.

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“…However, as with other forming processes, significant residual stresses are developed for this process as well, which necessitate appropriate characterization to ensure that the performance of the formed products are not detrimentally affected by these locked-in stresses [Schajer, 2013]. Contour method and X-ray diffraction technique have been employed in Khanlari1 and Honarpisheh1 [2020], and Romero-Resendiz et al [2020], respectively, to quantify the through thickness variation of residual stress in angular channel extruded products. However, owing to the complexity of these methods, variation of residual stress along the thickness of the formed product at few chosen locations could only be obtained.…”

Section: Introductionmentioning

confidence: 99%

Oscillatory Residual Stresses in Steady Angular Channel Extrusion

Ray,

Chakraborty,

Chatterjee

2021

Preprint

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Angular channel extrusion has evolved as processes that can induce significant strengthening of the formed product through grain refinement. However, significant residual stresses are developed in the extruded product whose quantification is necessary for accurate process design and subsequent heat treatment. Experimental evaluation of residual stress provides the through thickness (normal) variation at chosen sampling points on the formed product and may provide inaccurate estimates if variations along the extrusion (longitudinal) directions are present. Process models can complement the experimental measurements and improve the estimates of residual stress distribution. While models of this process have been developed, very few of them have been applied to understand the variation of residual stress in the formed products. The present work aims to address this limitation by providing a complete map of residual stress distribution in angular extrusion process through numerical simulations. Interestingly, our simulations show that the angular channel extruded product can have significant longitudinal variation of residual stress depending on the extrusion ratio and strain hardening rate. Detailed analyses of the process reveals that these spatial oscillations occur due to cyclic movement of the contact location between the die and the top-billet surface in the exit channel. The outcome of this study suggests that accurate measurement technique of residual stress field in angular channel extruded products should consider the possibility of longitudinal variations. The findings can be extended to other continuous forming processes as well.

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Effect of the initial ECAP passes on crystal texture and residual stresses of 5083 aluminum alloy

Cited by 8 publications

References 27 publications

Effect of Equal Channel Angular Pressing on the Properties of Rolled Commercial Purity A1100 Aluminum

Effect of Equal Channel Angular Pressing on the Properties of Rolled Commercial Purity A1100 Aluminum

Microstructure, mechanical properties and deformation mechanisms of an Al-Mg alloy processed by the cyclical continuous expanded extrusion and drawing approach

Oscillatory Residual Stresses in Steady Angular Channel Extrusion

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