Modelling of semi-liquid aluminium flow in extrusion

• Autorzy: Skorulski G. , Piwnik J.
• Języki publikacji: EN

Abstrakty

EN

Experimental modeling using substitute materials is usually a simply way to obtain satisfacted results. This kind of experiment is characterizing by low cost. The significant results may be quickly applying using theory of probability. The way of modelling the deformation mechanisms during extrusion of aluminium alloys in semi - liquid phase, the way of preparing samples and experimental technique has been analysed in the following work. On the ground of received results (i.e. registrations of consecutive process steps) the grid of the flow velocity vectors on a flat sample surface was done. It allowed to draw conclusions which one of the basic deformation mechanisms is dominant in particular stage of the process. The technique of measurement has been shown as well. Experiments are made using plasticine and rape oil as a substiute materials. Some kind of different variants have been investigated. To ensure that such model experiments provide useful information it is essential to select model materials and prepare samples that would exhibit (preferably at room temperature) similar behaviour and similar deformation mechanisms as those present during the actual deformation process of aluminium alloys in a semi-liquid state. In particular the FLS, SS and PDS mechanisms should be adequately reproduced.

Słowa kluczowe

EN

innovative materials and foundry technologies; thixoforming; experimental modelling; semi-liquid alloys; extrusion

PL

materiały innowacyjne; technologie odlewnicze; aluminium półciekłe; wyciskanie

• Wydawca: Komisja Odlewnictwa Polskiej Akademii Nauk Oddział w Katowicach
• Czasopismo: Archives of Foundry Engineering
• Rocznik: 2007
• Tom: Vol. 7, iss. 2
• Strony: 31--36
• Opis fizyczny: Bibliogr. 16 poz., fot., rys.

Twórcy

autor

Skorulski G.

autor

Piwnik J.

• Chair of Materials Engineering and Mechanical Technology, Technical University of Białystok, Wiejska St. 45C , 15-351 Białystok,

Bibliografia

• [1] M.C. Flemings, R. Mehrabian: Casting semi-solid metals. AFS Trans., vol. 81 (1973) 81.
• [2] K. Suganuma, T. Okamoto, N. Suzuki: Semisolid extrusion of aluminium alloys reinforced with alumina short-fibre cladding, Journal of Materials Science Letters , vol. 6, No. 11 (1987 ) 1347-1348.
• [3] J.F. Seconde, M. Suery: Effect of solidification condition on deformation behavior of semi-solid Sn-Pb alloys, J. Material Science, vol. 19 (1994) 3995.
• [4] M.C. Flemings: Semi-solid forming: The process and the path forward, Metallurgical Science and Technology, vol. 18, No. 2 (2000) 3-4.
• [5] T.G. Nguyen, D. Favier, M. Suery: Theoretical and experimental study of the isothermal mechanical behavior of alloys in semi-solid state. Int. J. Plasticity, vol. 10, (1994), p.663.
• [6] L. Xie, J. Xu, B. Yang, Z. Zhang, L. Shi: Thixoforming and industrial applications of the semi-solid alloy Al-6Si-2Mg, Solid State Phenomena, vols. 116-117 (2006) 72-75.
• [7] M. Shiomi, D. Takano, K. Osakada and M. Otsu: Forming of aluminium alloy at temperatures just below melting point, International Journal of Machine Tools and Manufacture , vol. 43, Issue 3 (2003) 229-235.
• [8] L. Zu: Study on the powder mixing and semi-solid extrusion forming process of SiCp/2024Al composites, Journal of Materials Processing Technology, vol. 114, Issue 3, (2004) 189-193.
• [9] Q. Le-Hua, S. Zhong-Ke, L. He-Jun, C. Pei-Ling, H. Hong-Mei: Simulation of liquid infiltration and semi-solid extrusion for composite tubes by quasi-coupling thermal-mechanical finite element method, Journal of materials, vol. 38, No. 17 (2003) 3669-3675.
• [10] T. Basner, R. Pehlke, A. Sachdev: Thin-wall Back Extrusion of Partially Remelted Semi-Solid Sn-Pb, Metallurgical And Materials Transactions A-Physical Metallurgy And Materials Science, vol. 31 Issue: 1 (2000) 57.
• [11] K. Sołek, Z. Mitura: Physical and numerical simulation of thixoforming processes, Archives of Foundry, vol. 2, No. 4 (2002) 35-49 (in Polish).
• [12] A. Białobrzeski, K. Sołek, Z. Mitura: Attempt of numerical simulation of thixoforming cast, Archives of Foundry, vol. 2, No. 4 (2002) 35-49 (in Polish).
• [13] J. Piwnik, A. Patejuk: Energetistic criterion of longitudinal welding in hot extrusion of aluminium alloys, Archives of Foundry, vol. 6, No. 18 (2006) 161-166 (in Polish).
• [14] J. Piwnik, A. Patejuk: Criterion of transversal welding in hot extrusion of aluminium alloys, Archives of Foundry, vol.6, No. 18 (2006) 155-160 (in Polish).
• [15] J. Piwnik, A. Patejuk: Die-channel Optimization for Thixoforming Tools, Archives of Foundry, vol. 6, No. 21 (2006) 13-18 (in Polish).