Effect of Punch Surface Microtexture on the Microextrudability of AA6063 Micro Backward Extrusion

Tatsuya Funazuka*, Kuniaki Dohda, Tomomi Shiratori, Syunsuke Horiuchi, Ikumu Watanabe

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


To apply conventional forming processes to microscale processing, the influence of size effects caused by material properties and friction effects must be considered. Herein, the effects of tool surface properties, such as punch surface texture, on microextrusion properties, such as extrusion force, product shape, and product microstructure, were investigated using AA6063 billets as test pieces. Millimeter-scale, microscale, and nanoscale textures were fabricated on the punch surfaces. Punch texturing was conducted by electrical discharge machining or polishing or using a laser process. The extrusion force increased rapidly as the stroke progressed for all punch textures. Comparing the product shapes, the smaller the texture size, the lower the adhesion and the longer the backward extrusion length. The results of material analysis using electron backscatter diffraction show that material flowability is improved, and more strain is uniformly applied when a nanoscale-textured punch is used. By contrast, when a mirror punch was used, material flowability decreased, and strain was applied non-uniformly. Therefore, by changing the surface properties of the punch, the tribology between the tool and material can be controlled, and formability can be improved.

Original languageEnglish (US)
Article number2001
Issue number11
StatePublished - Nov 2022


  • aluminum alloy
  • microextrusion
  • microtexture
  • size effect
  • tribology

ASJC Scopus subject areas

  • Mechanical Engineering
  • Electrical and Electronic Engineering
  • Control and Systems Engineering


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