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Thixocasting and rheocasting technologies, improvements going on

Rosso M.

Journal of Achievements in Materials and Manufacturing Engineering

2012

Vol. 54, nr 1

110--119

Purpose: The paper proposes an overview of the actual most important and applied rheocasting technologies for the manufacturing of high performance Al components. Some excellent results recently attained in industrial applications are presented and discussed. Design/methodology/approach: Samples were machined from the produced parts and mechanical tests, i.e. tensile and impact, were executed on series of samples; moreover, microstructure features and the morphology of fractures were observed to check the quality of alloys and of produced castings. Findings: Despite the numerous rheocasting processes recently developed, it appears that their industrial application is still limited and some only are really interesting for the production of high performance component. The done investigations show that the use of a very simple and well controlled process leads to produce parts having excellent properties and reliability. The results obtained up to now suggest that the rheocasting route can be considered an attractive fabrication technology to produce high quality products, especially for aluminium alloys. Research limitations/implications: A lot of rheocasting processes are proposed, but for the final success it is necessary to choice a really valid process and to maintain all the steps under a strict control. Practical implications: The obtained results can be used for searching the appropriate way of improving the performance of highly stressed parts, using a very competitive and simple rheocasting process, contributing to make aluminium and its alloys still more attractive for light-weighting components for structural, as well as for automotive and aeronautic/aerospace applications. Originality/value: The main SSM technologies and future trends are presented and discussed. The properties of A356 and A357 aluminium alloys were investigated to establish the influence of the adopted Rheocasting process on the final performances and reliability of the produced parts.