Microscopic examinations could satisfy many purposes and one of the key persistence of it in materials engineering is examining defects in materials. Defects in a material determines important properties and performing microstructure examinations helps to develop relations between the microstructure of the material and its properties. Defects and imperfections are crucial factors and there are many types of defects. The material defect this particular experiment will focus on is an area defect, which is called grain boundary defect. It is an interfacial defect where there is boundaries separating different crystallographic orientations in polycrystalline materials. [1] The purpose of the experiment was to inspect the microstructure, the shape and size of the grains for different samples. The experiment was performed with optical microscope which is not as precise as electronic microscopes but are very easy to use and the results can be achieved much faster.