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<p>This study reveals the fundamental microstructural and textural transformations that occur in high-purity copper after a single pass of Equal Channel Angular Pressing (ECAP). The main issue addressed is the lack of understanding regarding the onset of grain refinement and texture development during the early stage of severe plastic deformation (SPD) in face-centered cubic (FCC) metals. Contrary to the common focus on multi-pass processing, this work demonstrates that even a single ECAP pass induces significant microstructural reorganization. Transmission Electron Microscopy (TEM) and Electron Backscatter Diffraction (EBSD) analyses show the formation of dense dislocation networks, subgrains, and a notable increase in high-angle grain boundaries (HAGBs), indicating the transition from a coarse-grained to an ultrafine-grained (UFG) structure. X-ray diffraction pole figure analysis reveals a pronounced shear texture characterized by {111}&lt;110 &gt; and {112}&lt;110 &gt; components. These findings highlight that substantial structural and crystallographic changes can be initiated through minimal deformation. The innovation of this work lies in its demonstration that meaningful grain refinement and texture evolution begin at the very first stage of ECAP, offering valuable insights for designing SPD strategies to tailor material properties. This contribution forms a critical basis for optimizing ECAP-based processing routes in copper and similar FCC metals, even at the initial deformation step.</p>

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Influence of initial deformation on microstructural and textural evolution of pure copper under severe plastic deformation

  • 期刊论文

  • 发表日期：

    2026年1月19日

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  • Muhammad Rifai,
  • Mujamilah Mujamilah,
  • Grace Tj Sulungbudi,
  • Andon Insani,
  • Ahadi Damar Prasetya,
  • Emy Mulyani,
  • Taufik Taufik

摘要

This study reveals the fundamental microstructural and textural transformations that occur in high-purity copper after a single pass of Equal Channel Angular Pressing (ECAP). The main issue addressed is the lack of understanding regarding the onset of grain refinement and texture development during the early stage of severe plastic deformation (SPD) in face-centered cubic (FCC) metals. Contrary to the common focus on multi-pass processing, this work demonstrates that even a single ECAP pass induces significant microstructural reorganization. Transmission Electron Microscopy (TEM) and Electron Backscatter Diffraction (EBSD) analyses show the formation of dense dislocation networks, subgrains, and a notable increase in high-angle grain boundaries (HAGBs), indicating the transition from a coarse-grained to an ultrafine-grained (UFG) structure. X-ray diffraction pole figure analysis reveals a pronounced shear texture characterized by {111}<110 > and {112}<110 > components. These findings highlight that substantial structural and crystallographic changes can be initiated through minimal deformation. The innovation of this work lies in its demonstration that meaningful grain refinement and texture evolution begin at the very first stage of ECAP, offering valuable insights for designing SPD strategies to tailor material properties. This contribution forms a critical basis for optimizing ECAP-based processing routes in copper and similar FCC metals, even at the initial deformation step.