Strain path and microstructure evolution during severe deformation processing of an as-cast hypoeutectic Al-Si alloy
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Authors
García-Infanta, J.M.
Zhilyaev, A.P.
Carreño, F.
Ruano, O.A.
Su, J.Q.
Menon, S.K.
McNelley, T.R.
Subjects
Advisors
Date of Issue
2010
Date
Publisher
Springer
Language
Abstract
Abstract Microstructure evolution in an as-cast Na modified Al–7%Si (wt. pct.) alloy was examined
during redundant and monotonic straining by repetitive equi-hannel angular pressing (ECAP) under
ambient temperature conditions, and during friction stir processing (FSP). Redundant straining
during repetitive ECAP was accomplished by processing following route BC while monotonic
straining employed route A. Single- and multi-pass FSP was conducted on this same as-cast material
using an FSP tool having a threaded pin. The as-cast microstructure comprises equiaxed primary a
dendrite cells embedded in the Al–Si eutectic constituent. The evolution of this microstructure
during repetitive ECAP can be described by idealized models of this process. The primary and
eutectic constituents can still be discerned and the Si particle distribution is not homogenized
even during ambient temperature processing involving von Mises strains [9.0. In contrast, the
primary and eutectic constituents cannot be distinguished in the stir zone after even a single FSP
pass. Strain estimates based on the shape change of the primary a constituent indicate that the Si
particle distribution has become homogeneous at local von Mises strains of 2.5–3.0
during the FSP thermomechanical cycle. Mechanical property data are consistent with strain path
during SPD processing by repetitive ECAP and FSP.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1007/s10853-010-4530-4
Series/Report No
Department
Mechanical and Aerospace Engineering (MAE)
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
CICYT
Spanish Ministry of Education and Science
U.S. Air Force Office of Scientific Research (AFOSR)
National Research Council
Spanish Ministry of Education and Science
U.S. Air Force Office of Scientific Research (AFOSR)
National Research Council
Funder
MAT2003/01172 (CICYT)
BES-2004-4865 (SMES)
FIATA06058G001 (AFOSR)
BES-2004-4865 (SMES)
FIATA06058G001 (AFOSR)
Format
8 p.
Citation
J.M. Garcia-Infanta, A.P. Zhilyaev. F. Carreño, O.A. Ruano, J.Q. Su, S.K. Menon, T.R. McNelley, "Strain path and microstructure evolution during severe deformation processing of an as-cast hypoeutectic Al-Si alloy," Journal of Materials Science, v.45 (2010), pp. 4613-4620.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.