Strain path and microstructure evolution during severe deformation processing of an as-cast hypoeutectic Al-Si alloy
MetadataShow full item record
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.
The article of record as published may be found at http://dx.doi.org/10.1007/s10853-010-4530-4
Showing items related by title, author, creator and subject.
Erratum to "Microtexture and microstructure evolution during processing of pure aluminum of repetitive ECAP" Zhilyaev, A.; Swisher, D.L.; Oh-ishi, K.; Langdon, T.G.; McNelley, T.R. (2006);Erratum to “Microtexture and microstructure evolution during processing of pure aluminum by repetitive ECAP” [Mater. Sci. Eng. A 429 (2006) 137–148]
Production of ultra-fine grains and evolution of grain boundaries during severe plastic deformation of aluminum and its alloys Swisher, Douglas Lee (Monterey, California. Naval Postgraduate School, 2000-12);Equal channel-angular pressing (ECAP) is a recently developed method for deformation processing of material that can produce an ultra-fine grain structure in bulk material through severe plastic deformation. This study ...
Oh-Ishi, Keiichiro; McNelley, Terry R. (Minerals, Metals and Materials Society, 2005-06);The influence of friction stir processing (FSP) parameters on the evolution of microstructure in an equilibrium-cooled, as-cast NiAl bronze (NAB) material was evaluated by optical microscopy (OM) and transmission ...