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METALLOGRAPHY LAB #3 APRIL 28, 2005 METALLURGY 331 OBJECTIVE This laboratory experiment and report have 2 separate objectives: The objective of our experiment is to learn specimen preparation techniques in metallography and study the microstructures of typical engineering alloys. The objective of the lab report is to explain the techniques that were learned and use them to help identify the specific alloy that was provided for the experiment. INTRODUCTION The term metallography has been in use since the 1700's, however at that time it was defined as the description of metals and their properties. It was not used in its modern sense, the process of preparing a metallic sample and observing or recording its microstructure, until 1892. Since then, there have been constant advancements in technology, which have provided a far superior procedure which is in use today. The metallographic preparation process can be subdivided into 5 categories: - sectioning - mounting - grinding - polishing - etching Sectioning can be defined as...

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