Microstructural evolutions of the Al strip prepared by cold rolling and continuous equal channel angular pressing

Lee, Jae Chul; Seok, Hyun‐Kwang; Suh, Jin-Yoo

doi:10.1016/s1359-6454(02)00200-8

Cited by 198 publications

(106 citation statements)

References 30 publications

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“…614) Based on the main deformation mode, the SPD processes can be divided into several groups: (i) simple shear: equal channel angular pressing 69) and continuous confined strip shearing; 10) (ii) torsion shear: high-pressure torsion, 11,12) twist extrusion, 13) high-pressure tube twisting, 14) and conecone method; 15) and (iii) compression: accumulative rollbonding 16) and multi-directional forging. 17) Along with other torsion-based SPD processes, twist extrusion (TE) recently received some interest, which is illustrated by the emergence of new techniques based on the idea of TE.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Two Twist-Based SPD Processes: Elliptical Cross-Section Spiral Equal-Channel Extrusion vs. Twist Extrusion

2013

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The present paper deals with numerical comparison of two twist-based severe plastic deformation processes: (i) the elliptical cross-section spiral equal-channel extrusion (ECSEE) proposed recently as a novel process and (ii) the classical twist extrusion (TE). ECSEE was developed in attempt to process cylindrical work pieces and to generate more uniform strain distribution compared to classical TE. However, the present finite element simulations showed that twist zones used in both methods impose identical stress and strain states. Furthermore, the ability of ECSEE to treat cylindrical billets is achieved at the expense of the possibility to perform multi-pass extrusion through the twist zone and it requires higher loads for the overall process of extrusion.

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Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Two Twist-Based SPD Processes: Elliptical Cross-Section Spiral Equal-Channel Extrusion vs. Twist Extrusion

2013

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“…Kavackaj et al (2012). The effect of the temperature on the accelerated grain refining during the continuous ECAP operation was discussed by Lee et al (2002). illustrated the effect of ECAR pass on microstructure and properties of magnesium alloy sheets.…”

Section: Introductionmentioning

confidence: 99%

Applicability of Artificial Neural Network and Nonlinear Regression to Predict Mechanical Properties of Equal Channel Angular Rolled Al5083 Sheets

Mahmoodi

Naderi

2016

Lat. Am. j. solids struct.

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Equal channel angular rolling (ECAR) is a severe plastic deformation (SPD) process in order to achieve ultrafine-grained (UFG) structure. In this paper, the mechanical properties of ECAR process using artificial neural network (ANN) and nonlinear regression have been illustrated. For this purpose, a multilayer perceptron (MLP) based feed-forward ANN has been used to predict the mechanical properties of ECARed Al5083 sheets. Channel oblique angle, number of passes and the route of feeding are considered as ANN inputs and tensile strength, elongation and hardness are considered as the outputs of ANN. In addition, the relationship between input parameters and mechanical properties were extracted separately using nonlinear regression method. Comparing the outputs of models and experimental results shows that models used in this study can predict and estimate mechanical properties appropriately. Where, the performance of ANN model is better than the correlations to predict mechanical properties. Finally, the developed outputs of neural network model are used to analyze the effects of input parameters on tensile strength, elongation and hardness of ECARed Al5083 sheets.

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“…Based on the geometry of the work-piece, SPD techniques can be divided into the three groups nominating bulk, sheet, and tube classifications. For group 1: equal channel angular pressing (ECAP) [1], high pressure torsion (HPT) [2], twist extrusion (TE) [6], accumulative back extrusion (ABE) [7]; for group 2: equal channel angular rolling (ECAR) [8], accumulative roll bonding (ARB) [9], constrained groove pressing (CGP) [10]; and for group 3: high pressure tube twisting (HPTT) [11], accumulative spin bonding (ASB) [12], tubular channel angular pressing (TCAP) [13] are the major examples. It should be pointed out that the principal rule of all SPD methods consists of imposing shear stress to the sample, increasing the dislocation density in deformed material, formation of dense dislocation walls and then low angle grain boundaries (LAGBs), and, finally, transformation of LAGBs into high angle grain boundaries (HAGBs) [1,[14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Equal Channel Forward Extrusion Process

Ebrahimi

Djavanroodi

Tiji

et al. 2015

Metals

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Among all recognized severe plastic deformation techniques, a new method, called the equal channel forward extrusion process, has been experimentally studied. It has been shown that this method has similar characteristics to other severe plastic deformation methods, and the potential of this new method was examined on the mechanical properties of commercial pure aluminum. The results indicate that approximate 121%, 56%, and 84% enhancements, at the yield strength, ultimate tensile strength, and Vickers micro-hardness measurement are, respectively, achieved after the fourth pass, in comparison with the annealed condition. The results of drop weight impact test showed that the increment of 26% at the impact force, and also decreases of 32%, 15%, and 4% at the deflection, impulse, and absorbed energy, are respectively attained for the fourth pass when compared to the annealed condition. Furthermore, the electron backscatter diffraction examination revealed that the average grain size of the final pass is about 480 nm.

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Microstructural evolutions of the Al strip prepared by cold rolling and continuous equal channel angular pressing

Cited by 198 publications

References 30 publications

Comparative Analysis of Two Twist-Based SPD Processes: Elliptical Cross-Section Spiral Equal-Channel Extrusion vs. Twist Extrusion

Comparative Analysis of Two Twist-Based SPD Processes: Elliptical Cross-Section Spiral Equal-Channel Extrusion vs. Twist Extrusion

Applicability of Artificial Neural Network and Nonlinear Regression to Predict Mechanical Properties of Equal Channel Angular Rolled Al5083 Sheets

Experimental Investigation of the Equal Channel Forward Extrusion Process

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