Cold Working of Titanium and Ti6A14V Alloy by Hydrostatic Extrusion

  • J. Breme
  • U. Zwicker


Many technical problems concerning the mechanical installation and lubricants for hydrostatic extrusion have been solved [1,2]. In investigations of the influence of deformation on the microstructure under biaxial stress at 20°C [3] and of the partial hydrostatic extrusion [4] of titanium alloys, hexagonal dislocation networks were observed in the deformation zone of a biaxial deformed Ti5Al2.5Sn alloy and in the unextruded part of a billet of titanium which contained 0.35 wt.% oxygen. The networks which occurred exclusively on the basal planes were explained as being caused by the biaxial stress state which originated from the strain of the imposed hydrostatic pressure and/or by the deformation fields extended back into the billet due to the die geometry. With Ti6A14V it was shown that hydrostatic pressure has a favorable effect on the cold deformability and allows a higher degree of cold working as well as a more homogeneous deformation through the total area of the extruded material, compared with a material which was cold swaged [5].


Titanium Alloy Hydrostatic Pressure Basal Plane Stack Fault Energy Maraging Steel 
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Copyright information

© Springer Science+Business Media New York 1979

Authors and Affiliations

  • J. Breme
    • 1
  • U. Zwicker
    • 1
  1. 1.Universität Erlangen-NürnbergErlangenW. Germany

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