Influence of Hot Extrusion Temperature on the Microstructure and the Mechanical Properties of (ABOw + WO3p)/Al Hybrid Composites

Effect of Extrusion Temperature on the Microstructure and Mechanical Properties of SiCnw/2024Al Composite

“…After extrusion treatment, the porosity of the SiCnw/2024Al composite has been significantly decreased (Figure 3b,c). It has been widely reported that one of the main advantages of the hot-extrusion treatment is the densification [23,25,29]. Moreover, the porosity of the SiCnw/2024Al composite has been almost eliminated after extrusion treatment at 520 °C and 560 °C (Figure 3d,e), indicating more effective densification process at higher temperatures due to the good deformability of the Al matrix [30].…”

“…Attributed to the rheology shear stress of the Al matrix, the reinforcements are prone to being re-distributed along the extrusion direction. Moreover, it has been widely reported that the extrusion treatment would cause the breakage of high aspect ratio reinforcements (such as whiskers [29,34]) due to the mismatch of the deformation ability. In order to measure the average length of the SiC nanowires after extrusion, the microstructure of SiCnw/2024Al composite extruded at 560 °C after being etched by 10% NaOH solution for 480 s is shown in Figure 7a, and eventually the length of the SiC nanowires was counted by the Nano Measurer software.…”

“…However, Tavighi et al [28] reported that the tensile strength of the 16 wt.% Al 4 Srp/Al composites was decreased with the extrusion temperature (390 to 500 °C) while the ductility reached maximum at 420 °C. Contrarily, Feng et al [29] reported that the strength of pure Al matrix composites reinforced with 22 vol.% Al 18 B 4 O 33 whiskers and 3 vol.% WO 3 particles was initially increased and then decreased with the extrusion temperature (440 to 560 °C). Feng et al [29] also observed that the length of Al 18 B 4 O 33 whiskers in the composites was increased with the temperature.…”

“…Contrarily, Feng et al [29] reported that the strength of pure Al matrix composites reinforced with 22 vol.% Al 18 B 4 O 33 whiskers and 3 vol.% WO 3 particles was initially increased and then decreased with the extrusion temperature (440 to 560 °C). Feng et al [29] also observed that the length of Al 18 B 4 O 33 whiskers in the composites was increased with the temperature. Meanwhile, Hong et al [30] revealed that the strength of 2024Al composites reinforced with 20 vol% SiC whiskers were increased linearly with the extrusion temperature (470 to 530 °C) due to the improved alignment of the SiC whiskers.…”

Characterization of A356 aluminum matrix composite affected by SiC particle size and extrusion parameters

“…The conducted studies indicate that extrusion temperature can increase the mechanical properties of metal matrix composites (MMCs) as a result of improvement of interfacial bonding, particle distribution, density, and particle alignment. However, at very high temperatures, some defects such as surface cracking [14], banding [15,16] coarsening of precipitating phases [17] or grain growth [18] may deteriorate the mechanical properties. Hence, an optimum value for the extrusion temperature is generally reported [14,15,17,18].…”