The objective of this lab is to see the effect of hot and cold rolling of Al 5083. And to see the effect of cooling on a casted Aluminum 7075 alloy. Once the alloy is cast it will be cold rolled to 20, 40, 60, and 80% reduction and hot rolled to 40, 60, and 80% reduction samples. The rolling will produce a change in the hardness and grain size. The hardness will be tested using a Rockwell hardness test for the grain size measurements we will etch and anodize the surface. Once that is done an optical microscope will be used to take pictures which will be analyzed using image-J. The hardest material was the cold rolled 80% with a hardness average of 77.66 HRB, the softest material was the non-rolled sample and the 80% hot rolled sample with an average hardness of 29.09 HRB and 29.20 HRB respectively. The optical imaging showed a general grain size reduction with rolling in comparison to the non-rolled sample. Introduction Aluminum has many applications because of its strength to weight ratio and …show more content…
This was cut into quarter sections. A book mold made of two rectangular halves was also used to create the cast alloy. In both cast the top oxide layer was removed. The cut pieces was then mounted on the round side not facing up. A resilin agent was applied using a q tip swab. Epoxi cure tm2 20-3430-128 and hardener was then slowly mixed and poured into the mold. The ratio of resin and hardener was 4.35:1. Once in the mold it was allowed to cure for 12 hours in a vacuum hood. The facts was then removed with an 800 then 1200 grit paper. Once the facets where removed the face was polished with a 1.0 and 0.5um alumina polishing slurry. After each step the surface was rinsed with tap water. The face was finally anodized with barker’s reagent at 20V for