Effect of Accumulative Roll Bonding Process on Mechanical Properties of Al-Based Composite Reinforced with Nano-Trioxide Tungsten

In the present study, an Al/WO3p metal matrix nanocomposite was fabricated by accumulative roll bonding(ARB) technique. Mechanical properties of specimens were investigated by microhardness and tensile test.Several factors that affect uniform distribution particles were investigated. After 12 ARB cycles, ananocomposite with a uniform distribution of nanoparticles was produced. It was shown that the tensilestrength of the ARBed composite enhanced with the increasing number of ARB cycles. After the first cycle, asignificant increase was observed in the tensile strength of nanocomposite in 2.0 percent volume of WO3p,from 89 MPa to 128 MPa (almost 1.4 times increase in strength). After the final cycle, the tensile strengthvalue increased to 205 MPa (that is almost 2.3 times increase in strength) due to the strain hardening and grainrefinement. The X-ray diffraction results showed that Al/WO3p nanocomposite with the average crystallitesize of 41 nm was successfully attained after 12 cycles of the ARB process. Finally, observations revealed thatthe fracture mode in Al/WO3p nanocomposite was of type shearing ductile fracture with elongated shallowdimples.

Effect of Accumulative Roll Bonding Process on Mechanical Properties of Al-Based Composite Reinforced with Nano-Trioxide Tungsten Keywords:

Accumulative Roll Bonding , Nanocomposite , Microstructure , Mechanical Properties