Effect of Experimental Conditions on 7075 Aluminium Response during Thixoextrusion

Abstract:

The deformation behavior of semi-solid aluminum alloy is strongly dependent on the microstructure. This paper illustrates several experimental research works concerning thixoextrusion of 7075 aluminum alloy which was carried out at “Arts et Métiers ParisTech” of Metz. Inductive re-heating of the aluminum billet is the method used in order to obtain the target liquid fraction for thixoextrusion. To minimize the heat losses, a sample obtained from a direct extruded bar is inserted in a die for reheating in semisolid state and thixoextrusion. During the experimental re-heating process, the temperature was directly controlled by using thermocouples for temperature measurements in the sample and also in the die. The influence of different working ram speeds and reheating temperature on the microstructure evolution was studied by optical microscopy. The experimental results on extrusion load and microstructure evolution of the component are reported.

• Periodical: Key Engineering Materials (Volumes 504-506)
• Pages: 345-350
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.504-506.345
• Online since: February 2012
• Authors: Adriana Neag, Véronique Favier, Mariana Pop, Eric Becker, Régis Bigot
• Keywords: 7075 Aluminum Alloy, Microstructure, Semi-Solid, Thixoextrusion

References

[1] P. Kapranos, D.H. Kirkwood, C.M. Sellars, Semi-solid processing of tool steel, J.Physique IV, (3) (1993) 835-840.

DOI: 10.1051/jp4:19937131

[2] H.V. Atkinson, Modelling the semisolid processing of metallic alloys, Progress in Materials Sci. 50 (2005) 341-412.

DOI: 10.1016/j.pmatsci.2004.04.003

[3] M. Suery, Mise en forme des alliages métalliques à l'état semi-solide, Traité MIM Mecanique et Ingénierie des Matériaux, Ed. Lavoisier, 2002.

DOI: 10.51257/a-v1-m3050

[4] H.V. Atkinson, K. Burke, G. Vaneetveld, Recristalisation in the semi-solid state in 7075 aluminum alloy, Mater.Sci.Eng. A, 490 (2008) 266-276.

DOI: 10.1016/j.msea.2008.01.057

[5] G. Vaneetveld, A. Rassili, H.V. Atkinson, Influence of parameters during induction heating cycle of 7075 aluminium alloys with RAP process, Solid State Phenomena Vols. 141-143 (2008) 719-724.

DOI: 10.4028/www.scientific.net/ssp.141-143.719

[6] A. Neag, V. Favier, R. Bigot, D. Frunză, Study on Thixo-extrusion of Semi-solid aluminium, 10th Int.Conf. Semi-Solid Processing of Alloys and Composites, Aachen-Liege, (2008) 659-664.

[7] K.P. Young, C.P. Kyonka, J.A. Courtois, Fine grained metal composition, US Patent no. 4,415,374, 30 March, (1982).