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      저자 : Kerim Özbeyaz (검색결과 1 건)
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        Novel SPD Method: Twisted Variable Channel Angular Extrusion

        Kerim Özbeyaz,Hasan Kaya,Aykut Kentli 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.5

        Different types of SPD techniques are applicable and have been studied by various researchers. All of them have severaladvantages and disadvantages. Equal Channel Angular Pressing (ECAP) is one of the most popular SPD techniques and isstill being developed. The aim of this paper is to improve the efficiency of ECAP process by putting forward a novel design(Twisted Variable Channel Angular Pressing (TV-CAP)) and also to achieve higher mechanical properties when comparedto conventional ECAP processes. For this purpose, a new TV-CAP die was designed by combining three different methods:ECAP, Twist Extrusion, and Direct Extrusion. The new design was able to integrate the advantages of each methodto the workpiece material. In this context, the design parameters of the TV-CAP die were first identified by finite elementanalysis (FEA) in Deform-3D. The TV-CAP die was produced according to the determined parameters and AA5083 alloywas pressed with this novel die. Hardness and tensile tests were carried out to compare mechanical properties. In addition,Optical Microscope, SEM, TEM images were taken, and XRD and EBSD analyses were carried out to examine the changesin grain structure. As a result of this experimental study, an increase of 197.3% was observed in the hardness value and anincrease of 144.7% was achieved in the tensile strength value by using the novel TV-CAP die. These results also agreed withthe effective strain values obtained from the FEA.

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