Hot deformation behaviour of SiC p /2024 aluminium alloy composites reinforced with various sizes of SiC p

Abstract

The hot deformation behaviour of SiC_p/2024 aluminium alloy composites, with various sizes of SiC_p reinforcements (1,8, 15, 36, and 44 μm), was studied by hot torsion tests in the temperature range 320–520°C under strain rates of 0.2–3.0 S^-l. For the composites reinforced with 8, 15, 36, and 44 flm SiC_p, dynamic recrystallisation (DRX) was responsible for hot restoration at 320–480°C, while for the composite reinforced with 1 μm SiC_p DRX was responsible for hot restoration at 320–430°C, and dynamic recovery was responsible for hot restoration at 480°C. The composite reinforced with 8 μm SiC_p showed the highest flow stress (265 MPa) at 320°C and the highestfailure strain (3.65) at 480°C under a strain rate of 1.0 S^-l; while composite reinforced with 1 μm SiC_p showed the highest strain rate sensitivity (0.36) at 480°C.