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Título

Influence of the thermal treatment on the deformation-induced precipitation of a hypoeutectic Al-7wt% Si casting alloy deformed by high-pressure torsion

AutorCepeda-Jiménez, C.M.; García-Infanta, J.M.; Zhilyaev, A. P.; Ruano, Oscar Antonio; Carreño, Fernando
Palabras claveAl-Si alloys
High-pressure torsion
Deformation-induced precipitation
Microstructure
Mechanical properties
Fecha de publicaciónene-2011
EditorElsevier
CitaciónJournal of Alloys and Compounds 509 (3) : 636-643 (2011)
ResumenA hypoeutectic Al-7wt%Si alloy was subjected to high-pressure torsion (HPT) at room temperature using an imposed pressure of 6 GPa and torsional straining through five revolutions. Different thermal treatments, prior to the HPT processing, resulted in reducing supersaturated Si concentration in comparison to the as-cast materials. Microstructural parameters and microhardness were evaluated in the present work. Processing by HPT produced significant grain refinement with grain sizes of about 200- 400 nm. Furthermore, fine deformation-induced Si precipitates from the supersaturated solid solution were observed, which are very useful in retaining the fine microstructure during HPT processing. The microhardness increase was outstanding, with values for processed samples twice higher (84HV) than that for the as-cast Al-7wt%Si alloy (44HV). The results demonstrate that the refining and strengthening of the Al matrix by HPT processing depend on the available supersaturated solid solution during the processing.
Versión del editorhttp://dx.doi.org/10.1016/j.jallcom.2010.09.122
URIhttp://hdl.handle.net/10261/43766
DOI10.1016/j.jallcom.2010.09.122
ISSN0925-8388
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