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Ali Shokuhfar,Mahmoud Shamsborhan 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.5
A new severe plastic deformation (SPD) method based on equal channel angular pressing (ECAP) is introduced for producing ultrafinegrains in bulk alloys, entitled as “Planar twist channel angular extrusion (PTCAE)”. In PTCAE method, there is additional angle, α, (plusφ and ψ angles in ECAP method) which represents angle associated with the lateral reversal arc of curvature in deformation zone. Threedimensional finite element method (FEM) simulations of both ECAP and PTCAE processes were performed in order to investigate theplastic deformation state of processed samples and, moreover, the effect of different die geometry (in terms of variation of planar twistangle) on plastic strain distribution and magnitude. Results revealed that PTCAE process related with ECAP process can impose higherstrain values in different shear planes simultaneously in one deformation zone. Therefore, PTCAE can produce UFG or nanostructuredmaterials better than ECAP method which has simpler design and significantly higher efficiency compared with other new SPD processes.