Microstructure of AA7075 Based Composite by Accumulative Roll Bonding Process

Accumulative Roll Bonding (ARB) is a Severe Plastic Deformation (SPD) process invented in order to fabricate ultrafine grained materials. Aluminum Alloy series 7075 (AA7075) is a metal as a matrix reinforced by Alumina Nanofiber (ANF). In the development of advanced materials, AA7075/ANF composite metal is very suitable if it is processed by ARB, due to the combination of high style roll that is capable of producing material properties better. Hardness of AA77075 without reinforcement reached 128.3 Hv10. The additions of ANF on AA7075 reduce the hardness of 103.2 Hv10. This is due to large deformation of high load on the ARB which results in decrease levels of precipitates as well as lower density and reduction in the average grain size.