Effect of copper tube casing on strain distribution and mechanical properties of Al-7075 alloy processed by equal channel angular pressing

Shaeri, M.H.; Djavanroodi, F.; Sedighi, M.; Ahmadi, Somayeh; Salehi, Mohammad Taghi; Seyyedein, S. H.

doi:10.1177/0309324713498234

Cited by 32 publications

(8 citation statements)

References 42 publications

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“…The results obtained in the present study are in good agreement with the results published by Shaeri et al [11]. They developed the strategy to increase the homogeneity of severely deformed material by ECAE by providing the copper tube casing (CTC).…”

Section: Variation In Microhardness Of Inserts Covered With Cu Casing At Different Regionssupporting

confidence: 92%

Severe plastic deformation of AA 5083 and copper bimetallic metal

Varadala

Gurugubelli

Bandaru³

2020

SN Appl. Sci.

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The purpose of the present study is to investigate the effect of Cu casing and wall thickness of the drilled copper bars on uniform distribution of imposed stain in terms of structural homogeneity and distribution of micro-hardness in the severely deformed AA 5083 after equal channel angular extrusion (ECAE). In this study, AA 5083 cylindrical inserts of 6 mm, 8 mm and 10 mm diameter with 100 mm length are tightly inserted in the 16 mm square copper bars having the respective diameter holes. The square cross sectioned AA 5083 billets of 16 mm × 16 mm and 100 mm length are also considered as feedstock. The longitudinal surfaces of the bimetallic metals are polished and annealed at 530 °C for 1 h and then processed by ECAE up to four passes in route A (same sense after every pass without any rotation) at room temperature using a die with square cross-sectioned channels having channel intersection angle (ϕ) 105° and outer corner angle (Ψ) 30°. The initial grain size of 60 µm has been greatly refined and the ultrafine grains of the sizes in the range of 400-700 nm are formed in the extruded AA 5083 inserts after the four passes. The microhardness of extruded AA 5083 significantly increased from 69 to 134 VHN, 132, 176 and 157 respectively for the square billets without Cu casing and cylindrical inserts with the diameters of 6, 8 and 10 mm covered with Cu casing after the four passes. The variations in the microhardness measurements at different regions on the sectioned surfaces are also investigated in this study. The requirement of pressing force is very significantly reduced by using copper casing which is having more ductile nature and the frictional forces between the copper and steel die are very less as compared to the Aluminium and steel. The chances of formation of dead metal zone are avoided by filling the corner gap by cooper metal during the ECAE process. The uniform distribution of strain imposed on the severely deformed billets develops the homogeneous ultrafine grain structure and significantly improves the micro-hardness of the processed material.

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Section: Variation In Microhardness Of Inserts Covered With Cu Casing At Different Regionssupporting

confidence: 92%

Severe plastic deformation of AA 5083 and copper bimetallic metal

Varadala

Gurugubelli

Bandaru³

2020

SN Appl. Sci.

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“…The lower imposed strain in each pass of the MDF process compared to the other common SPD processes such as ECAP can be considered as the main reason of high fraction of LAGBs in the MDFed sample. As a result of a relatively low imposed strain, accumulated strain after three passes of MDF (ε = 1.5) is presumably inadequate to transform LAGBs into HAGBs [13,32].…”

Section: Resultsmentioning

confidence: 99%

Microstructure, Texture, Electrical and Mechanical Properties of AA-6063 Processed by Multi Directional Forging

et al. 2018

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In current research, the effect of the multi-directional forging (MDF) process on the microstructure, texture, mechanical and electrical properties of AA-6063 under different heat treatment conditions at various MDF temperatures was studied. The annealed AA-6063 alloy was processed up to three passes of MDF at ambient temperature. Three passes of this process were also applied to the solution-treated AA-6063 at ambient temperature and 177 °C. Microstructural investigations demonstrated that the MDF process led to a significant reduction in the average grain size as well as a considerable increase in the fraction of low angle grain boundaries. Texture analysis revealed that copper and Goss textures were mainly developed within the annealed and solution-treated samples of AA-6063, respectively. The hardness and shear strength values of all processed samples also showed a sizeable improvement compared to the initial heat-treated samples. For example, the hardness and shear yield strength value of the solution-treated sample MDFed for three passes showed more than 100 and 70% increase, respectively. The effect of the MDF process on the electrical conductivity of AA-6063 under different heat treatment conditions at various temperatures was negligible. So, it can be concluded that the MDF process increased the mechanical properties without an appreciable decrease in electrical conductivity.

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“…Severe plastic deformation (SPD) methods have proved their capability and potential as a suitable technique for production of bulk ultrafine grain (UFG), and even, nanostructure (NS) metals and alloys [1][2][3][4][5]. Some of the prominent SPD methods which have been well developed include equal channel angular pressing (ECAP) [6,7], equal channel forward extrusion [8], high-pressure torsion (HPT) [9], planar twist extrusion (PTE) [10], constrained groove pressing (CGP) [11], accumulative roll bonding (ARB) [12], cryorolling [13], multi-directional forging (MDF) [14], etc. It is generally accepted that materials with refined grain structure can be prepared by imposing shear stress through SPD methods, during which the density of dislocations significantly increases.…”

Section: Introductionmentioning

confidence: 99%

Tribological Characterization of Commercial Pure Titanium Processed by Multi-Directional Forging

Ansarian

Shaeri

Ebrahimi

et al. 2019

Acta Metall. Sin. (Engl. Lett.)

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This work discusses tribological properties of commercial pure (CP) titanium processed by multi-directional forging (MDF) up to six passes at room temperature and 220 °C. For this purpose, wear test was conducted by dry sliding pin-on-disk method on the initial and ultrafine grained samples using different stress magnitudes of 1, 1.5 and 2 MPa. The results showed that wear resistance of CP titanium increases after the first pass of MDF in comparison with the initial condition, irrespective of the applied normal stress. For example, the average wear rate of MDFed samples was decreased about 30% and 24%, after first pass at room temperature and 220 °C, respectively. However, average wear rate of the samples processed by six MDF passes was reduced about 40% at lower normal loads; it was increased about 9% at higher ones as compared to the initial condition. It was also found that the dominated wear mechanisms were abrasive and delaminated at the lower stresses, while the delamination mechanism was intensified and a slight adhesion was observed during the higher applied normal loads.

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Effect of copper tube casing on strain distribution and mechanical properties of Al-7075 alloy processed by equal channel angular pressing

Cited by 32 publications

References 42 publications

Severe plastic deformation of AA 5083 and copper bimetallic metal

Severe plastic deformation of AA 5083 and copper bimetallic metal

Microstructure, Texture, Electrical and Mechanical Properties of AA-6063 Processed by Multi Directional Forging

Tribological Characterization of Commercial Pure Titanium Processed by Multi-Directional Forging

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