2024-03-29T14:26:23Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/437662021-09-22T10:19:26Zcom_10261_66com_10261_3col_10261_319
2011-12-27T12:52:27Z
urn:hdl:10261/43766
Influence of the thermal treatment on the deformation-induced precipitation of a hypoeutectic Al-7wt% Si casting alloy deformed by high-pressure torsion
Cepeda-Jiménez, C.M.
García-Infanta, J.M.
Zhilyaev, A. P.
Ruano, Oscar Antonio
Carreño, Fernando
Al-Si alloys
High-pressure torsion
Deformation-induced precipitation
Microstructure
Mechanical properties
A 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.
2011-12-27T12:52:27Z
2011-12-27T12:52:27Z
2011-01
artículo
Journal of Alloys and Compounds 509 (3) : 636-643 (2011)
0925-8388
http://hdl.handle.net/10261/43766
10.1016/j.jallcom.2010.09.122
eng
http://dx.doi.org/10.1016/j.jallcom.2010.09.122
openAccess
Elsevier