دانلود مقاله های انگلیسی استخراج شده از science direct
Microstructure and mechanical properties of ultra-fine grains (UFG}s aluminum strips produced by ARB process
Mehdi Eizadjou, Habib Danesh Manesh∗, Kamal Janghorban
Department of Materials Science and Engineering, School of Engineering, Shiraz University, Shiraz, Iran
Accumulative roll-bonding (ARB) process is a severe plastic deformation process capable of developing
grains below1min diameter and to improve mechanical properties. In this study, strips of a commercial
pure aluminum were ARB-processed to eight cycles, and their micro structures and mechanical properties
were investigated. XRD and TEM studies of the strips showed grain refinement, and the TEM micrograph of
the alloy ARBed for eight cycles showed ultra-fine grains (UFGs) of high-angle grain boundaries ∼360nm
in size. The ambient tensile strength and micro hardness of the ARB-processed samples increased with
the number of ARB cycles. Whereas, the elongation dropped abruptly at the first cycles, above which it
remained nearly constant. With increasing ARB process, the bending strength increased and sliding wear
resistance decreased. SEM fractography of fractured surfaces after tensile tests revealed that failure mode
in ARB-processed aluminum was shear ductile rupture with elongated small dimples.
© 2008 Published by Elsevier B.V.