The hardness of different materials by Rockwell scale Lab Report

The hardness of different materials by Rockwell scale - Lab Report Example The obtained data is consistent to the hardness tester calibrations. The experiment was done through performing the different tests on metals having the hardness that is known. There was a close similarity between the experimental values and the published values of hardness. From the results, it is evidenced that cast iron was the hardest material followed by 1018 steel, brass and lastly aluminium. Aluminium is considered to be relatively durable, soft, lightweight, malleable and ductile metal having an appearance that ranges from silver towards dull grey. Its appearance is dependent on the roughness surface. Aluminium is nonmagnetic and has a low potential for ignition. An aluminium fresh field acts as a good visible light reflector and a delightful reflector of far and medium infrared radiations. Pure aluminium has the yield strength of 7 to 11 MPa whereas its alloy has a yield strength of about 200MPa-600MPa. Studies conducted on the hardness of aluminium found out that aluminium ’s hardness is one third that of steel. This research argued out that aluminium was less hard than steel. The hardness of cast iron was close to that of 1018 steel.On the other hand, the hardness of brass changes according to its treatment and preparation and treatment. The hardness may reduce whenever the annealation is done at temperatures that are elevated (Zhang 2). The acoustic and malleability characteristics of brass make the metal be extremely useful in musical instruments such as trumpets (Anyalebechi 2).