Investigating of the Microstructure and Mechanical Properties of Al-Based Composite Reinforced with Nano-Trioxide Tungsten via Accumulative Roll Bonding ProcessReportar como inadecuado




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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.

KEYWORDS

Accumulative Roll Bonding, Nanocomposite, Microstructure, Mechanical Properties

Cite this paper

Kahani Khabushan, J. and Bazzaz Bonabi, S. 2017 Investigating of the Microstructure and Mechanical Properties of Al-Based Composite Reinforced with Nano-Trioxide Tungsten via Accumulative Roll Bonding Process. Open Journal of Metal, 7, 9-23. doi: 10.4236-ojmetal.2017.71002.





Autor: Jalal Kahani Khabushan1,2, Soheila Bazzaz Bonabi2

Fuente: http://www.scirp.org/



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