Fullerene/A5083 composites fabricated by material flow during friction stir processing

Process Parameters Optimization for Producing AA6061/TiB2 Composites by Friction Stir Processing

“…Y. Morisada et. al [33] successfully fabricated the fullerene/A5083 composites by FSP and reported that fullerene molecules were dispersed in the AA5083, improved the hardness which was due to pinning effect and reduction of grain size.…”

Al/C60 Nanocomposites Fabricated by High-Pressure Torsion

“…For the 10-and 15-turn disks and beyond a distance of 4 mm from the center, the Hv values appear to reach saturation at Hv % 152. This hardness is larger than the maximal hardness values of fullerene-reinforced pure Al (118 Hv [8] ) and Al5083 (135 Hv [7] ) matrix composites processed by HPT and FSP, respectively. In processing by HPT, the shear strain imposed on a disk, c, is estimated by c ¼ 2pNr=h, [11] where r is the distance from the center of the disk, and h is the thickness of the disk.…”

“…This grain size is smaller than the grain sizes in pure Al (~287 nm) and Al-3 vol pct carbon nanotube (~65 nm) processed similarly. [10] The grain structure is also finer than Al-5 wt pct fullerene processed by HPT under an applied pressure of 2.5 GPa for 15 turns (~80 nm [8] ) and Al5083-fullerene fabricated by FSP under the travel speed of 50 mm min À1 and the tool rotating rate of 1500 rpm (~200 nm [7] ). The SAD pattern, shown as inset in Figure 2 The Vickers microhardness, Hv, values are shown in Figure 3(a) where the lower line shows the initial microhardness for the Al-fullerene powder before HPT.…”

“…Utilizing of SPD techniques not only hinders the formation of detrimental phases, but also uniformly disperses the fullerene within the matrix and significantly refines the matrix microstructure. Morisada et al [7] have dispersed fullerene into Al5083 by friction stir processing (FSP) and have shown a remarkable increase of hardness by both the grain refinement and the dispersion of fullerene molecules. Tokunaga et al [8] have used high-pressure torsion (HPT) for consolidation of Al-fullerene powders.…”

Effect of Welding Speed on Microstructure and Mechanical Properties due to The Deposition of Reinforcements on Friction Stir Welded Dissimilar Aluminium Alloys

“…It has been reported that the microhardness of the composite was increased due to grain refinement and reinforcement of cabon nanotubes. Morisada et al [15] reported AA5083 composites fabricated by fullerene powder of mean grain size 25.4 µm in to a groove of 1 mm× 2 mm during friction stir processing. Sun et al [16] reported the deposition of SiC particles in to copper plates of 2mm thickness by friction stir welding which improved the mechanical properties of the welded joint.…”