High strain rate superplasticity in a nano-structured Al–Mg/SiCP composite severely deformed by equal channel angular extrusion

High strain-rate superplasticity of fine- and ultrafine-grained AA5083 aluminum alloy at intermediate temperatures

“…For example, in this range of temperature, Al-3%Mg-0.2%Sc alloy exhibited superplastic elongation of 640% [17] and commercial AA5083 Al alloy showed a strain rate sensitivity (SRS) of m = 0.4 [20]. Some other investigations have also reported HSRS for ultra-fine and fine grained Al-Mg alloys processed by Equal Channel Angular Extrusion (ECAP) and Friction Stir Processing (FSP) [4][5][6]. Although processing by ECAP improved the HSRS and LTS behaviors of different alloys, most of the samples used for ECAP process were in the form of rectangular or circular bars, which were not suitable for producing sheets for SPF.…”

“…Therefore, during recent years, several researches have been conducted in order to achieve high strain rate superplasticity (HSRS) for commercial aluminum alloys [3][4][5][6]. In practice, high strain rate superplasticity refers to a superplastic ductility obtainable at strain rates of 10 -2 s -1 or higher [2].…”

“…In practice, high strain rate superplasticity refers to a superplastic ductility obtainable at strain rates of 10 -2 s -1 or higher [2]. It has been shown [4][5][6][7][8][9][10] that by refining the grains to submicrometer sizes, superplasticity can occur at high strain rates and low temperatures. There are three main methods for reducing the grain size of aluminum alloys including complex thermo-mechanical treatments which involve large reductions during cold rolling [11,12], adding small amounts of alloying elements such as Zr or Sc to the base alloy [13,14] and utilizing severe plastic deformation (SPD) processes such as ECAP [15,16].…”

“…SPD techniques are capable of producing fine and ultra-fine grain microstructures in aluminum and magnesium alloys, which can result in enhanced superplastic ductilities [19]. Ultra-fine grained aluminum alloys processed by SPD techniques have shown high strain rate superplasticity and/or low temperature superplasticity (LTS) behaviors [4][5][6][7][8][9][10][11]. For Al-Mg alloys processed by ECAP, LTS feature was obtained at temperatures of 0.6-0.65 T m [20].…”

An alternative method for manufacturing Al/B4C/SiC hybrid composite strips by cross accumulative roll bonding (CARB) process

“…To overcome the aforementioned problems, accumulative roll bonding (ARB) as a severe plastic deformation (SPD) processing has been used as an effective method to fabricate the MMCs [7,8]. Compared with other SPD techniques such as equal channel angular pressing (ECAP), high pressure torsion (HPT), torsion extrusion (TE), severe torsion straining (STS), and cyclic closed die forging (CCDF), the ARB process has several advantages including: (1) it does not require expensive tools, (2) productivity rate is high, (3) the amount of material to be produced is not limited, (4) it has the potential to fabricate composites in the form of sheets, and (5) it is able to manufacture nanostructured composites [4,[9][10][11]. .…”