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Extrusion of nickel–titanium alloys Nitinol to hollow shapes

Extrusion of nickel–titanium alloys Nitinol to hollow shapes . Author: K. Müller Presenter: Joshua Furner Date: 16 September 2009. Function of Paper. Describe results of hot extrusion of NiTi alloys Development of extrusion principles for NiTi alloys . References.

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Extrusion of nickel–titanium alloys Nitinol to hollow shapes

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  1. Extrusion of nickel–titanium alloys Nitinol to hollow shapes Author: K. Müller Presenter: Joshua Furner Date: 16 September 2009

  2. Function of Paper • Describe results of hot extrusion of NiTi alloys • Development of extrusion principles for NiTi alloys

  3. References • 1. D. Stöckel, et al., LegierungenmitFormgedächtnis: Grundlagen-Werkstoffe-Anwendungen, Kontakt & Studium, Band 259, Expert VerlagRenningenMalmsheim, 1988. • 2. D. Stöckel, Formgedächtnis und Pseudoelastizität von Nickel–Titan-Legierungen. Metall.41 (1987), p. 5. • 3. H.-P. Kehrer and H. Nußkern, Erhöhungderumwandlungstemperatur von formgedächtnis-elementendurchkonstruktivemaßnahmen. Metall.46 (1992), p. 7. • 4. T.W. Duerig, A.R. Pelton and D. Stöckel, The use of superelasticity in medicine. Metall.50 (1996), p. 9. • 5. W. Thedja and K. Müller, Strangpressen von superelastischenNiTi-Legierungen. Metall.52 (1998), p. 12. • 6. K. Mueller, Grundlagen des Strangpressens, Expert VerlagRenningenMalmsheim, 1995. ISBN 3-8169-1071-8. • 7. K. Mueller, E. Hellum, Indirect tube extrusion of dispersion strengthened aluminum, in: Proceedings of the Third World Congress on Aluminum, Aluminum 2000, Limassol, Cyprus, April 15–19, 1997. • 8. L. Tillmann, K. Müller, W. Thedja, H. Nußkern, Massivumformung von Nickel–Titan, einWerkstoffmitaußergewöhnlichenEigenschaften, in: NeuereEntwicklungen in derMassivumformung, 1999, MAT INFO Werkstoff-Informations-Gesellschaft. ISBN 3-88355-282-8.

  4. Technical details • This paper discusses the extrusion process of a material with high deformation resistance • Consideration is taken in material selection for die design • Comparison of Direct and Indirect methods

  5. Parameters • Friction force • Die force • Ram displacement • Extrusion ratio • Deformation resistance • Temperature

  6. Deformation resistance • Specific Extrusion Pressure • Extrusion Ratio

  7. Design Principle • Indirect extrusion used because of reduced friction forces • High affinity between NiTi and steel results in welding • Cu canning of NiTi billet protects against this • Copper chosen because of its similar deformation properties at high temperature

  8. Indirect extrusion

  9. Billet Preparation

  10. Design Principles applied • Extrusion of composite billet results in 2 nested tubes when copper is chemically removed

  11. Data/tables/design discussed

  12. Fig. 4. Force–displacement diagrams with — FG: total force; indirect extrusion (right); FM: die force; direct extrusion (left); FR: friction force.

  13. Fig. 5. Deformation resistance kW of NiTi as a function of the billet temperature TB.

  14. Fig. 6. Specific extrusion pressure Pspec of NiTi in relation to the extrusion ratio lnV.

  15. Fig. 7. Deformation resistance kWC of NiTi/CuCr versus core fraction Vcore of CuCr.

  16. Fig. 9. Limits for indirect tube extrusion with a moving mandrel.

  17. Other design consideration

  18. Technical Advancement and industrial impact • Innovative solution to shaping NiTi alloys

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