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Nonuniform Deformation in Cold Extrusion of Billet Assembled with Dissimilar Metals

DOI
  • Taniguchi Daisuke
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
  • Miyamoto Jouji
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
  • Matsumoto Ryo
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University
  • Utsunomiya Hiroshi
    Division of Materials and Manufacturing Science, Graduate School of Engineering, Osaka University

Bibliographic Information

Other Title
  • 異種金属複合ビレットの冷間押出しにおける不均一変形
  • イシュ キンゾク フクゴウ ビレット ノ レイカン オシダシ ニ オケル フキンイツ ヘンケイ

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Abstract

<p>Clad materials are multi–materials with combined dissimilar metals. Clad materials exhibit unique properties that no monolithic materials show. In this study, cold extrusion was conducted to produce a clad bar from an assembled billet, where core was inserted in a sheath. A hard–core billet was prepared using copper for the core and aluminum for the sheath. By swapping copper and aluminum, a soft–core billet was also prepared. Under constant outer diameter of the billet, core diameter was varied 4mm, 6mm and 8mm. Two dies with different hole diameters were used to change the extrusion ratio. Working conditions to attain uniform deformation was limited by fracture of either core or sheath. As for the hard–core billets, core fraction was limited by sausaging and void formation at center in case of low extrusion ratio. Fracture of sheath took place when the extrusion ratio was small and the volume fraction was large. As for the soft–core billet, the core fraction to obtain uniform deformation was wider. However, the sheath showed fracture when the extrusion ratio was large and the core fraction was high.</p>

Journal

Details

  • CRID
    1390571563558740864
  • NII Article ID
    130008117363
  • NII Book ID
    AA11995570
  • DOI
    10.34562/jic.60.1_280
  • ISSN
    2435872X
    13477234
  • NDL BIB ID
    031637102
  • Text Lang
    ja
  • Data Source
    • JaLC
    • NDL
    • CiNii Articles
  • Abstract License Flag
    Allowed

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