I In the production process, forging or forging deformation is often used to make aluminum products. The amount of deformation will affect the value of the mechanical strength such as hardness. The purpose of this study was to answer the question of whether the deformation can increase the hardness of the material aluminum. Research methods as follows, workmanship step by making the aluminum sample size ( 25mm x 25mm x 10mm ) as many as 25 samples . The samples were then divided into five groups : the first group ( not forged ) , the second group ( 2x forging) , the third group ( 5x forging) , the I4, fourth group ( 10x forging) , the fifth gro • 17x forging) . Then the samples subjected to various tests namely: rnetallographic test, hardness test, and test chemical composition. Results of this study concluded that the more the effect on increasing hardness wrought aluminum samples.