Abstract
In the present investigation, an Al/WO3p metal matrix nanocomposite was fabricated by accumulative roll bonding (ARB) technique. Microstructural evaluation and mechanical properties of specimens were studied by Field Emission-Scanning Electron Microscopy, X-ray Diffraction, microhardness and tensile test. Several factors that affect uniform distribution of reinforcing particles were investigated. At the initial stages of ARB process particle free zones as well as particle clusters were observed in the microstructure of the composite. After 12 ARB cycles, a nanocomposite with a uniform distribution of nanoparticles was produced. It was shown that the tensile strength of the ARBed composite enhanced with the increasing number of ARB cycles. After the first cycle, a significant 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 strength value increased to 205 MPa (that is almost 2.3 times increase in strength) due to the strain hardening and grain refinement. The X-ray diffraction results showed that Al/WO3p nanocomposite with the average crystallite size of 41 nm was successfully attained after 12 cycles of the ARB process. Finally, observations revealed that the fracture mode in Al/WO3p nanocomposite was of type shearing ductile fracture with elongated shallow dimples.
Highlights
Accumulative roll bonding (ARB) is of the severe plastic deformation methods proposed by Tsuji et al [1] to achieve ultra-high strain in metallic materials without changing the specimen dimensions
The X-ray diffraction results showed that Al/WO3p nanocomposite with the average crystallite size of 41 nm was successfully attained after 12 cycles of the accumulative roll bonding (ARB) process
New nanocomposite with WO3 nanoparticle distribution is manufactured through 12 cycles of ARB process
Summary
Accumulative roll bonding (ARB) is of the severe plastic deformation methods proposed by Tsuji et al [1] to achieve ultra-high strain in metallic materials without changing the specimen dimensions. Accumulative roll bonding is a conventional method to process UFG materials. The roll bonding technique has been extensively used to fabricate nanocomposites because of its low cost and efficiency. This method has two important strengthening mechanisms, one is formation of Nano/UFG structure by SPD and the other is reinforcing metal matrix by ceramic particles [10] [11]. In this study the Al/WO3p nanocomposites were produced by ARB process where WO3 reinforced nanoparticles were dispersed directly during the initial cycles Several factors that are effective in uniform distribution of reinforcing particles were investigated
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