The aim of the project is to contribute to development of extrusion processes of aluminium alloys in semisolid state (Thixoextrusion). In order to perform the extrusion in semisolid state, different ingots with globular microstructure will be used. The project involves both, the production of ingots with globular alpha phase and the establishment of the optimum conditions to carry out the thixoextrusion. Currently, industrial processes of semi-solid metal forming (SSM) are limited to the conformation by Rheocasting techniques, which involve high pressure die casting of aluminium alloys with a globular alpha phase, such as A356 or A357 alloys. These alloys, until now are used exclusively for the obtaining cast components, but in this project they will be applied to perform components by semi-solid extrusion. The intention is open a new field of possibilities for the development of new alloys in the manufacture of extruded aluminium components. Besides these industrial objectives such as obtaining ingots with rheocasting structure and the thixoextrusion, the project attempts, from the scientific point of view, to contribute to the study of the processes of nucleation and growth of phases during the process of controlled solidification, using nucleating additives. Moreover, it will contribute to a better understanding of plastic deformation mechanisms of aluminium-silicon alloys in semisolid state. Furthermore, the effect of temperature, extrusion rate and percentage of deformation in the structural integrity of the products, will be studied. The die design and the optimization of thixoextrusion process will be performed by computer-aided simulation. One will experiment using an induction furnace and a 50-ton press. The microstructural characterization of rheocasting ingots and extruded products and the determination of mechanical properties will permit the process optimization and validating the performed simulations.
Picas, J.A.; Punset, M.; Menargues, S.; Martin, E.; Baile Puig, Maria Teresa Surface and coatings technology Vol. 268, p. 317-324 DOI: 10.1016/j.surfcoat.2014.10.039 Date of publication: 2015-04-25 Journal article
Menargues, S.; Martin, E.; Baile Puig, Maria Teresa; Picas, J.A. Materials science and engineering A. Structural materials properties microstructure and processing Vol. 621, p. 236-242 DOI: 10.1016/j.msea.2014.10.078 Date of publication: 2015-01-05 Journal article