CHARACTERIZATIONS OF FINE GRAINED 6061 AL ALLOY SHEETS PRODUCED BY ACCUMULATIVE ROLL- BONDING (ARB) PROCESS

*, ETRR-2, Nuclear Research Center, Atomic Energy Authority, Inshas 13759, Cairo, Egypt

** Metallurgy Department , Faculty of Engineering, Cairo University, Giza, Egypt.

*** Metallurgy Department, Nuclear Research Center, Atomic Energy Authority, ETRR-2,

Inshas 13759, Cairo, Egypt.

In the present study the accumulative roll-bonding (ARB) process was applied to the

AA6061 sheets. The produced sheets had been characterized in the deformed state

and after full annealing treatment. The accumulative roll-bonding (ARB) process is

intense plastic straining process. In the ARB process, a strip is neatly placed on top

of another strip. The two layers of material are joined together by rolling (reduction

degree of 50%) like a roll-bonding process. Then, the length of rolled material is cut

into two halves. These two haves are again stacked and roll-bonded. The whole

process is repeated again and again. By the ARB process, a very fine grain structure

of AA6061, less than three micron, was formed and the material was strengthened

dramatically. Full annealing process were subjected to ARB producing sheets. This

process causes structural coarsening and the strength of the specimens was

decreased but still more higher than initial sheets of AA6061 at the same annealing

condition and the elongation was increased from 13 % of ARBed sheets to 53 %

after the annealing process .