Structural evaluation and mechanical properties of nanostructured Al/B 4 C composite fabricated by ARB process

Structural evaluation and mechanical properties of nano structured Al/B4Ccomposite fabricated by ARB process

Morteza Alizadeh

, M.H. Paydar

, F. Sharifian Jazi

Department of Materials Science and Engineering, Shiraz University of Technology, Modarres Blvd., 71555-313 Shiraz, Iran

Department of Materials Science and Engineering, School of Engineering, Shiraz University, Zand Blvd., 7134851154 Shiraz,

Iran Department of Mining and Metallurgical Engineering, Amirkabir University of Technology, P.O. Box 15875 4413, Tehran, Iran

چکیده مقاله

Nano structured Al/B4C composites with an average grain size of 151 nm were successfully fabricated in

the form of sheets, by using accumulative roll bonding (ARB) process. Furthermore, monolithic Al (with-

out B4C particles) also was processed by the same method for comparison. The micro structure of the

composites, evaluated by optical and scanning electron microscopy, revealed the properly distributedB4C

particles in the Al matrix. The grain size of the Al matrix, after the final ARB cycle, is studied using

Williamson–Hall analysis of X-ray diffraction (XRD) pattern of the deformed sample. Mechanical proper-

ties of the specimens were investigated by tensile and hardness tests. The tensile strength and micro-

hardness of the processed samples increased with increasing the number of ARB cycle. Whereas, the

elongation dropped abruptly at the first cycle; afterwards, it remained nearly constant in the monolithic

samples and increased slightly in the composites.

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