FUNCTIONAL MODEL AND TECHNIQUE FOR SERIES PARTS MADE FROM LIGHT ALLOYS BY THIXOTROPY

Radu Stefanoiu; Emilia Binchiuciu; Ionelia Voiculescu; Victor Geanta

Radu Stefanoiu Politehnica University of Bucharest
Emilia Binchiuciu National R&D Institute for Welding and Material Testing – ISIM Timisoara
Ionelia Voiculescu Politehnica University of Bucharest
Victor Geanta Politehnica University of Bucharest

Keywords: aluminium-magnesium-alloys, thixotrop manufacturing, automotive industry

Abstract

The papers aim is to present the constructive solution of a functional model that makes complex parts by thixotropy process as well as their manufacturing process. Our functional model was used to develop, by pressing when the material reaches a dens plasticization state, in a matrix, light alloys made from Mg-Al obtained from recycling car wheels. The experimental lot characteristics, thus obtained, are detailed in the present paper and highlight a significant growth in performance, compared to previous parts, obtained by classic casting.

The metallographic structure of injected parts is type thixotrop, a lot different from the dendrite structure of cast parts. Resistance to compression-tearing is net superior if compared to cast parts, which facilitates applying the manufacturing process to products that have small geometry.

References

1. Kopp D., s.a., Different Concepts of Thixoforging and Experiments for Rheological Data, Journal of Materials Processing Technology, Volume: 111, Nr. 1-3/2001, pag. 48-52, (2001);
2. Collot Jean, Thixoforming of Magnesium and Aluminium alloys in the semi-solid or semi-liquid state, Hommes et fonderie, no.308, nov. (2000);
3. Sahm P.R., Thixocasting: Processing of light metals in the semi-solid state – Potential and applications, BRAMAT, Brasov, sept. (2001);
4. Atkinson H.V., Kapranos P., Kirkwood D.H., Alloy development for Thixoforming, Semi-solid processing of alloys and composites, 6th International Conference, Turin, p.443-450, (2000);
5. Collot J., Thixoforming of Magnesium and Aluminum alloys in semi-solid or semi-lichid, that is the question?, 64th World Foundry Congress, sept. Paris, (2000);
6. Brown SB, Flemings MC, editors. In: Proc. 2nd Int. Conf. on Semi-Solid Processing of Alloys and Composites, Cambridge, MA, USA, June 1992. Warrendale: TMS; (1992);
7. Kiuchi M, editor. In: Proc. 3rd Int. Conf. on Semi-Solid Processing of Alloys and Composites, Tokyo, Japan, June 1994. Tokyo Institute of Industrial Science, (1994);
8. Tsutsui Y, Kiuchi M, Ichikawa K, editors. In: Proc. 7th Int. Conf. on Advanced Semi-Solid Processing of Alloys and Composites, Tsukuba, Japan, Sept 2002. Japan: National Institute of Advanced Industrial Science and Technology and the Japan Society for Technology of Plasticity; (2002);
9. Collot Jean, Les differentes techniques de preparation et de mise en forme à l’état semi-solide des alliages metalliques, Fonderie-Fondeur d’aujourd’hui, no.129, (1993);
10. Elthalabawy, W. M. and Khan, T. I. Microstructural development of diffusion brazed austenitic stainless steel to magnesium using nickel interlayer, Materials Characterization, 61, 703-712, (2010).
11. Humpston, G. and Jacobson, D. M. Principles of Soldering, ASM International, Materials Park, Ohio, (2004).
12. Sun, D. Q., Lang, B., Sun, D. X. and Li, J. B. Microstructure and mechanical properties of resistance spot welded magnesium alloy joints, Materials Science and Engineering A, 460, 461, 494-498, (2007);
13. S. Sannes, H. Westengen, in: B.L. Mordike, K.U. Kainer (Eds.), Magnesium alloys and their applications, Werksto-Informationsgesellschaft mbH, Frankfurt, Germany, pp. 223±228, (1998);
14. ASM Handbook, Volume 1: Properties and Selection: Irons, Steels, and High-Performance Alloys, ISBN: 978-0-87170-377-4, (2010).