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MICROSCOPIC EXAMINATION OF METALS In this experiment our aim is examining the microstructure of metals By studying microscopic structures of metals we determine which material fits best to a given application We used the most common method optical technique to examine the microstructure We used a small specimen cut from the metal to be examined To be able to see the structure clearly we first cleaned and polished the specimen First we start polishing with emery paper no 1 and some finer grades One should be careful about the coarse abrasive particles and striations from them Cleaning and rotating the specimen 90 during the transfer can prevent these The next step is polishing yet washing the sample before polishing gives a more successful result Finally we polished the specimen on a rotating cloth covered with an effective abrasive like Al2O3-Water suspension We kept polishing until we obtained a mirror like face After we finished polishing the crystalline structure of the specimen any cracks seams non-metallic inclusions and inhomogenities could be revealed Before start etching we first applied mounting process In this step we used a matched die set We placed our sample into the die set in the way that the rough face of the specimen was the lower surface and the polished face looked upward We filled the die cavity with Bakelite and then we transferred our die to a mounpress Mounting not only protects our sample but also by making its base flat and stable helps us while we are examining the sample under the microscope In etching process depending upon chemical composition energy content and grain orientation we determine the grain boundaries and the presence of chemically different phases To reveal these micro structural details of the polished mount we used an etchant like 1 Nital We immersed the mount with the polished face upward in a small dish of etching solution As soon as a bloom appeared we removed the
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