Abstract
Severe plastic deformation (SPD) can produce ultrafine grained (UFG) and nanocrystalline (NC) materials by imposing intense plastic strain. One of the many options for inducing large plastic strains is to pass the material through a torsional/twist extrusion. The high-strength materials fabricated by SPD has no limit in dimension, and they can even be applied to load-carrying structural materials. Even though the method is quite successful, the industrial transfer has been limited so far because of low production efficiency and high cost. To remedy such difficulties, a new torsional extrusion process called nonlinear twist extrusion (NLTE) is introduced in this study, which has been designed based on two principles; (1) linear arrangement of the production line and (2) effective die geometry resulting in higher and more homogeneous plastic strain evolution which would give better grain refinement. The initial computational study of the designed geometry for the new extrusion process is addressed in the current study. The obtained results are discussed in detail with respect to conventional extrusion process, which is referred to as linear twist extrusion (LTE). The method is expected to offer a great potential for industrial use.
Highlights
Heavy deformation of metallic materials for the purpose of obtaining alloys with improved properties has centuries of history
The current study proposes a new Severe plastic deformation (SPD) technique called Nonlinear Twist Extrusion (NLTE) to overcome the disadvantages of linear twist extrusion (LTE) process
This study presents a new design for the twist extrusion (TE) process to obtain more effective grain refinement procedure and to overcome the disadvantages of classical processes
Summary
Heavy deformation of metallic materials for the purpose of obtaining alloys with improved properties has centuries of history In this context, the work of Bridgman [1] started a new era where intrinsically rather brittle metals were subjected to large deformation under high pressures to improve the mechanical properties. The work of Bridgman [1] started a new era where intrinsically rather brittle metals were subjected to large deformation under high pressures to improve the mechanical properties Since this approach, which has been regarded as the severe plastic deformation (SPD) method, has been of great interest worldwide for materials science community from both scientific and practical standpoints. The advantage of the straight movement of bars is the disadvantage in view of effective deformation routes for grain fragmentation because of limited deformation route In both methods, a shear strain of positive and negative sense is coupled in the channel [16].
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