Nano Scale Grain Refinement of High Purity and Particle Containing Aluminum Alloys by Accumulative Roll Bonding

In the present study, accumulative roll bonding (ARB) as a severe plastic deformation (SPD) method was carried out on a commercial purity aluminum (AA1100) and a particle containing alloy (AA3003). Electron backscattered diffraction (EBSD) technique was utilized to investigate the effects of the second phase particles on microstructural evolution in the ARBed sheets. The results indicate that development of a strong texture during the ARB process leads to unrefined bands in AA1100 alloy and transition of the microstructure to a nano-scale grain structure occurs at high levels of strain. It was also found that large lattice rotation around the second phase particles in AA3003 alloy increases the local misorientation and produces new high angle grain boundaries which in turn results in a more homogeneous microstructure of ultra-fine grains (UFG) in AA3003 alloy.

کلیدواژه ها:

Accumulative roll bonding ، Ultrafine grains ، Aluminum sheets ، Second phase particles ، Microstructure evolution