Matsci Lab4&5

Matsci Lab4&5 - Title Analysis of Microstructure...

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Title : Analysis of Microstructure through Optical Microscopy Objective : To analyze the microstructure of rolled brass using optical microscopy techniques.  To understand fracture, polymer, composite and ceramic fracture specimen will be analyzed  using stereomicroscopy. Procedure : To polish each specimen begin grinding under flowing water using 120 grit paper and  work down to 1200 grit, turning sample 90 degrees at each grit, eliminating deep scratches.  After 1200 grit, use a cloth with Alumina powder and dripping water to polish the samples.   To reveal the microstructure, etch the polished samples in the safety hood using a ferric  chloride etch solution.  The polished surface is wetted with the solution, using a Q-tip.  When the  surface starts to cloud over or starts to be lightly brown (Cu) rinse immediately under flowing  water.  Check the results on the light microscope. If the surface looks smooth and very bright,  redo etching. If the surface looks dark and scarred, then it has been over-etched and the last  polishing step has to be repeated (1 μ Al2O3slurry) before retching.   When the surface is etched properly the microstructure can be seen under the  microscope.  Examine the samples they polished under a light microscope with a computer.  Print the image of a standard .1mm grid at the same magnification and process the image of the  grid the same way as the image of the microstructure. Observations: 
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This note was uploaded on 06/02/2008 for the course MSE 27100 taught by Professor Bockstaller during the Spring '07 term at Carnegie Mellon.

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Matsci Lab4&5 - Title Analysis of Microstructure...

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