A Study on Tensile Strength, Hardness and Fractography of Cryorolled AA 6061 Alloy

The effect of cryorolling and cold rolling on tensile strength and hardness of Al 6101 alloy have been investigated in the present work. The Al 6101 alloy was rolled in two high rolling mills for different thickness reduction (10%, 20%, 30%, and 40%) at cryogenic (liquid nitrogen) temperature and at atmospheric temperature and its mechanical properties were studied by using tensile testing and hardness. The microstructure characterization of the tensile failure specimen was carried out by using scanning electron microscopy (SEM). It is observed that the tensile strength and hardness of cryorolled material up to 40 % thickness reduction have increased compare to the cold rolling. The improved tensile strength and hardness of the cryorolled Al 6101 alloy is due to grain refinement, decreasing dimple size with increasing the percentage of thickness reduction and ultra-fine grain (100nm