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Materials Research

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HYODO, Alexandre; BOLFARINI, Claudemiro  and  ISHIKAWA, Tomaz Toshimi. Chemistry and tensile properties of a recycled AA7050 via spray forming and ECAP/E. Mat. Res. [online]. 2012, vol.15, n.5, pp.739-748.  Epub Aug 09, 2012. ISSN 1516-1439.

The aim of this work is to evaluate the conjugation of advanced processing techniques, such as spray forming, extrusion and ECAP as a processing route for reuse of machining chips generated during aircrafts manufacturing parts from AA7050-T7451 raw material plates supplied according to AMS 4050H1. In this way, the sprayforming process was used for remelting, and billet production, followed by extrusion and ECAP. At the end of the process, an artificial aging according to AMS 2772E 2 was conducted. An assessment of chemical composition, microstructure, and mechanical properties evolution throughout the process were performed. The results have showed that this proposed route may be used as a potential technological route for secondary aluminum source. For extrusion route for overaged condition, 144 MPa yield strength and 14% of elongation was attained. Beside this, at this stage of work, was verified that the hot extrusion process is more effective for reduction of porosity and microstructure development than ECAP, but on the other hand this one has reduced porosity dispersion significantly for the extrusion parameters adopted. The adopted homogenization schedule, followed by artificial aging after has resulted in excessive grain growth.

Keywords : recycling; aerospace alloy; machining chip; re-use.

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