Non-equal channel angular pressing of aluminum alloy

Tóth, László; Lapovok, Rimma; Hasani, Arman; Gu, Chengfan

doi:10.1016/j.scriptamat.2009.09.006

Cited by 43 publications

(33 citation statements)

References 10 publications

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“…e maximum possible value of x is 1; it happens when the back-pressure punch does not move: it is xed. is situation corresponds to the case of nonequal channel angular pressing (NECAP) which was examined analytically and experimentally in [16,17,20]. e lateral extrusion ratio (x) is plotted as a function of the n thickness ratio in Figure 2, from a number of experiments conducted with and without back pressure.…”

Section: E Effect Of Die Geometry and Back Pressure On The Formation mentioning

confidence: 99%

“…However, the microstructure produced by PFM is heterogeneous while it is mostly homogeneous in LSEM, and the hydrostatic pressure produced in the deformation zone in PFM is likely to be higher than that in LSEM. PFM also exhibits a common feature with nonequal channel angular pressing (NECAP) [16,17] in terms of the working principle. Indeed, lateral extrusion in PFM works in the same way as in NECAP.…”

Section: Introductionmentioning

confidence: 99%

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The New Plastic Flow Machining Process for Producing Thin Sheets

Beygelzimer

Kulagin

et al. 2018

Advances in Materials Science and Engineering

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A new severe plastic deformation (SPD) process called plastic flow machining (PFM) was recently proposed to produce thin sheets with gradient structures. In the present paper, the role of the die geometry is investigated by studying the effects of the produced sheet thickness (h) on the material properties of commercial pure Aluminum (Al1050) processed by PFM. The obtained experimental results show that an increase of h in the range of 0.65 to 1.5 mm improved the formation efficiency of the sheet. Microstructures of the produced sheets show gradient structures with an average grain size varying from 0.8 to 3.81 µm across the sheet thickness. Both experiments and finite element (FE) simulations document that the degree of the gradient in the microstructure became more significant when h was increased. Sheets produced by PFM exhibited a better strength-ductility balance than sheets obtained in other SPD processes. Tensile strength of 160–175 MPa and total ductility of 18–25% were obtained for the processed samples after PFM. A rise of h from 0.65 to 1.5 mm lowered the strength but enhanced the ductility of the produced sheet, which is due to the coarser microstructure at larger values of h.

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Section: E Effect Of Die Geometry and Back Pressure On The Formation mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The New Plastic Flow Machining Process for Producing Thin Sheets

Beygelzimer

Kulagin

et al. 2018

Advances in Materials Science and Engineering

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“…This shift can be so significant that the flow line can describe a flow for non‐equal channel angular extrusion, called NECAE, which differs from the ECAE test by a reduced diameter of the exit channel with respect to the entry one. The NECAE test was first introduced by Toth et al and was theoretically examined in ref . In a recent paper, texture and microstructure results were presented for NECAE of Al.…”

Section: Effects Of the Parameters On The Shape Of The Flow Linementioning

confidence: 99%

Deformation Field Analysis in Equal Channel Angular Extrusion of Metals Using Asymmetric Flow Function

Hasani

Tóth

2015

Adv Eng Mater

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The trajectory and the corresponding plastic deformation of a material element during equal channel angular extrusion (ECAE) are analyzed with the help of a flow line function applicable for any ECAE die angle. The function contains the following three parameters: the parameter n that describes the sharpness of the line and the a and m parameters that account for the asymmetry of the flow line. The approach permits to determine the velocity field, the strain rate field, and, in general, the shape of the plastic deformation zone in ECAE experiments even for flow lines that are asymmetric with respect to the ECAE geometry. The flow line function was applied to flow lines observed in 90°and 120°ECAE of commercially pure aluminum as well as for 135°ECAE of pure copper to describe the characteristics of the deformation field and the evolution of the crystallographic texture.

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“…Использование обработки с перерывом первичного ста-рения путем охлаждения до комнатной температуры (режим «I») подтверждает возможность получения более высокой максимальной твёрдости и максимального упрочнения за меньшее время и без снижения твёрдости по сравнению со стандартной обработкой. Кроме того, эти режимы могут быть объединены с различными режимами пластической деформации [21,22].…”

Section: Introductionunclassified