Abstract
Conventional equal channel angular pressing is an efficient technique to obtain bulk ultrafine grained materials (UFG) with extraordinary mechanical properties in the form of rods. In this work, an incremental method of ECAP process which allows to obtain thick sheets with UFG structure is presented. Using this method square plates (62 × 62 mm) were obtained. In this case, a combined route – A+ specific B – with 90 degree rotation along plate normal after each pass keeping other planes in the same positions relatively to the channel – has been applied. The efficiency of this methods was proved for technically pure 1050 aluminium. It was processed by incremental ECAP using 8 passes of A+B route. To characterize microstructure visible light microscopy and transmission electron microscopy were used. Mechanical properties were measured by microhardness test. The results obtained showed that the microstructure and mechanical properties of 1050 aluminium alloy processed by incremental ECAP are comparable to conventional ECAP. However, the new processing method broaden the potential applications of UFG materials.
Highlights
Ultrafine grained (UFG) materials are of the great scientific interest because of extraordinary mechanical strength they can reach in comparison to their coarse grained counterparts [1, 2]
Despite the popularity of the mentioned methods and continuous development of new ones equal channel angular pressing (ECAP) [6] and its modifications are still the most promising severe plastic deformation (SPD) technique which can be adopted by industry
3.1 finite element (FE) modelling During incremental ECAP deformation conditions are the same as in conventional ECAP
Summary
Ultrafine grained (UFG) materials are of the great scientific interest because of extraordinary mechanical strength they can reach in comparison to their coarse grained counterparts [1, 2]. Despite the popularity of the mentioned methods and continuous development of new ones equal channel angular pressing (ECAP) [6] and its modifications are still the most promising SPD technique which can be adopted by industry It has been proved in numerous papers that significant grain refinement down to UFG regime via ECAP can be obtained with only few passes [7, 8] and a considerable increase in mechanical strength occurs even after a single pass [9]. Different modifications, such as various rotations of billet [10], multiple pass channels [11], applying backpressure [12] or temperature control [13] allows to tailor final properties of ECAPed products
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