Investigations on workability of commercial purity aluminum processed by equal channel angular pressing

Sivaraman, Aparna; Chakkingal, Uday

doi:10.1016/j.jmatprotec.2007.10.006

Cited by 32 publications

(15 citation statements)

References 12 publications

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“…As it illustrated in Fig. 15(b), performing DE after three TE passes increases micro- Table 4 Comparison of mechanical properties of as-annealed pure aluminum after three TE passes, three passes TE + DE with three ECAP passes using route C for elements 159 and 29 [15]. hardness values to an average of about 46 Hv throughout the middle cross-section.…”

Section: Mechanical Propertiesmentioning

confidence: 90%

“…In other words, the strain heterogeneity reduces throughout the cross-sectional plane. Table 4 compares the mechanical properties of as-annealed pure aluminum after three TE passes, three passes TE + DE with three ECAP passes using route C [15]. The table shows that performing three TE passes increases the strength properties significantly, as the tensile strengths in the center and in the corner regions enhance from 55.14 MPa and 49.30 MPa to 162.93 MPa and 179.40 MPa, respectively.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

“…The magnitudes of tensile and yield strengths achieved in this study are comparable with those obtained from the equal channel angular process (ECAP). Sivaraman and Chakkingal [15] conducted three ECAP passes on pure aluminum specimen, increased the tensile strength from 60 MPa to 158 MPa.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

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Numerical and experimental studies of the plastic strains distribution using subsequent direct extrusion after three twist extrusion passes

Mousavi

Bahadori

Shahab

2010

Materials Science and Engineering: A

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Section: Mechanical Propertiesmentioning

confidence: 90%

Section: Microstructure Evolutionmentioning

confidence: 99%

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Numerical and experimental studies of the plastic strains distribution using subsequent direct extrusion after three twist extrusion passes

Mousavi

Bahadori

Shahab

2010

Materials Science and Engineering: A

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“…The samples were extruded at 100, 150, and 200 ºC through route Bc using ECAP die with tool angles of Φ =90º and Ψ =10º using a hydraulic press of 200 ton capacity, with pressing speeds of 10 mm/min. These die angles were chosen based on an earlier finite element study [10] which showed they induce optimal strain homogeneity in the processed materials. In order to verify the mechanical properties changes, individual values of the hardness were measured on two orthogonal diameters of the billet.…”

Section: Methodsmentioning

confidence: 99%

An electron back-scattered diffraction study on the microstructure evolution of severely deformed aluminum AI6061 alloy

Vaseghi¹,

Taheri²,

Kim³

2014

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this paper dynamic strain ageing behavior in an Al-Mg-Si alloy related to equal channel angular pressing (ECAP) was investigated. In order to examine the combined plastic deformation and ageing effects on microstructure evolutions and strengthening characteristics, the Al6061 alloy were subjected to Φ=90• ECAP die for up to 4 passes via route Bc at high temperatures. For investigating the effects of ageing temperature and strain rate in ECAP, Vickers hardness tests were performed. The combination of the ECAP process with dynamic ageing at higher temperatures resulted in a significant increase in hardness. The microstructural evolution of the samples was studied using electron back-scattering diffraction (EBSD). The grains of Al6061 aluminum alloy were refined significantly at 100 and 150 ͦ C with greater pass numbers and the distributions of grain size tended to be more uniform with pass number increasing. Frequency of sub-boundaries and low angle grain boundaries (LAGBs) increased at initial stage of deformation, and sub-boundaries and LAGBs evolved into highangle grain boundaries (HAGBs) with further deformation, which resulted in the high frequency of HAGBs in the alloy after ECAP 4 passes.

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“…However, the material can still flow significantly in tension after the necking and the fracture strains can be fairly high. Therefore, the formability of ultrafine grained materials can still be very good as was shown by Sirivaraman and Chakkingal [6], who studied the deformability of ultrafine grained commercial purity aluminum by upsetting tests. Also, the instability and fracture that are observed in tension do not necessarily occur in the same way in shear, and the torsion deformation can continue to much higher strains before the final fracture of the material.…”

Section: Introductionmentioning

confidence: 92%

High Strain Rate Torsion Properties of Ultrafine-Grained Aluminum

et al. 2011

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Mechanical properties of most metallic materials can be improved by reducing their grain size. One of the methods used to reduce the grain size even to the nanometer level is the severe plastic deformation processing. Equal Channel Angular Pressing (ECAP) is one of the most promising severe plastic deformation processes for the nanocrystallization of ductile metals. Nanocrystalline and ultrafine grained metals usually have significantly higher strength properties but lower tensile ductility compared to the coarse grained metals. In this work, the torsion properties of ECAP processed ultrafine grained pure 1070 aluminum were studied in a wide range of strain rates using both servohydraulic materials testing machines and Hopkinson Split Bar techniques. The material exhibits extremely high ductility in torsion and the specimens did not fail even after 300% of strain. Pronounced yield point behavior was observed at strain rates 500 s −1 and higher, whereas at lower strain rates the yielding was continuous. The material showed slight strain softening at the strain rate of 10 −4 s −1 , almost ideally plastic behavior at strain rates between 10 −3 s −1 and 500 s −1 , and slight but increasing strain hardening at strain rates higher than that. The tests were monitored using digital cameras, and the strain distributions on the surface of the specimens were calculated using digital image correlation. The strain in the specimen localized very rapidly after yielding at all strain rates, and the localization lead to the development of a shear band. At high strain rates the shear band developed faster than at low strain rates.

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Investigations on workability of commercial purity aluminum processed by equal channel angular pressing

Cited by 32 publications

References 12 publications

Numerical and experimental studies of the plastic strains distribution using subsequent direct extrusion after three twist extrusion passes

Numerical and experimental studies of the plastic strains distribution using subsequent direct extrusion after three twist extrusion passes

An electron back-scattered diffraction study on the microstructure evolution of severely deformed aluminum AI6061 alloy

High Strain Rate Torsion Properties of Ultrafine-Grained Aluminum

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