A mathematical modelling of preheated accumulative roll bonded Al-Al₂O₃ composite sheet

Abstract

Accumulative roll bonding (ARB) technique is used in this paper to produce aluminum/alumina composite sheets. Alumina content was added as 1,3 and 5wt%. The produced Al/Al 2 O 3 composite sheets are piled up and processed by accumulative roll bonding (50% reduction) after preheating at 280°C with different regimes (2-8 cycles). Statistical design analysis was applied to examine the effects of alumina content and no. of accumulative roll bonding cycles on the ultimate tensile strength for aluminum/alumina composite sheets. Empirical formulas were deduced to recognize key parameters that controlling tensile behavior. XRD detection was carried out to explore dominant planes controlling plasticity Al/Al 2 O 3 composites. In general, addition of alumina and proceeding different cycles increases strength. FE-SEM microstructure showed that alumina plays important roll on the aluminum sheets during ARB process where the metal of aluminum flow among them producing highly sheared matrix.