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

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Präsentation zum Thema: "Extrusion of nickel–titanium alloys Nitinol to hollow shapes Author: K. Müller Presenter: Joshua Furner Date: 16 September 2009."—  Präsentation transkript:

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., Legierungen mit Formgedächtnis: Grundlagen-Werkstoffe-Anwendungen, Kontakt & Studium, Band 259, Expert Verlag Renningen Malmsheim, D. Stöckel, Formgedächtnis und Pseudoelastizität von Nickel–Titan-Legierungen. Metall. 41 (1987), p H.-P. Kehrer and H. Nußkern, Erhöhung der umwandlungstemperatur von formgedächtnis- elementen durch konstruktive maßnahmen. Metall. 46 (1992), p T.W. Duerig, A.R. Pelton and D. Stöckel, The use of superelasticity in medicine. Metall. 50 (1996), p W. Thedja and K. Müller, Strangpressen von superelastischen NiTi-Legierungen. Metall. 52 (1998), p K. Mueller, Grundlagen des Strangpressens, Expert Verlag Renningen Malmsheim, ISBN 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, L. Tillmann, K. Müller, W. Thedja, H. Nußkern, Massivumformung von Nickel–Titan, ein Werkstoff mit außergewöhnlichen Eigenschaften, in: Neuere Entwicklungen in der Massivumformung, 1999, MAT INFO Werkstoff-Informations-Gesellschaft. ISBN

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 F G : total force; indirect extrusion (right); F M : die force; direct extrusion (left); F R : friction force.

13 Fig. 5. Deformation resistance k W of NiTi as a function of the billet temperature T B.

14 Fig. 6. Specific extrusion pressure P spec of NiTi in relation to the extrusion ratio ln V.

15 Fig. 7. Deformation resistance k WC of NiTi/CuCr versus core fraction V core 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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