By Delmar V. Miley, Arthur E. Calabra (auth.), James L. McCall, William M. Mueller (eds.)
/.letallography is far greater than taking amazing images at excessive magnifications or sprucing and etching specimens in any such manner that no scratches will be obvious. primarily, metallography is the actual metallurgist's most respected and such a lot used device for learning metals. even though it is likely to be his oldest software, it definitely isn't really more likely to develop into out of date. relatively, the ongoing calls for which were put upon fabrics have required extra designated charac terizations in their microstructures and this, in flip, has re quired the metallographer to improve new ideas to make those characterizations. no longer too a long time in the past, the metallographer had merely optical microscopes with which to ascertain his specimens. Now he has elec tron microscopes, scanning electron microscopes, and a complete host of tools that have been unknown to him just a quite few years in the past. This has pressured him to benefit not just the way to use those new tools and the way to interpret the data that they supply however it additionally has made him enhance new options for getting ready the samples for examination.
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Additional resources for Metallographic Specimen Preparation: Optical and Electron Microscopy
Hairline cracks and craze caused by forceful cutting must be polished out before the material may be examined with the microscope. The traditional methods of removing the sample from the bulk material use hack saws, band saws and abrasive cutoff wheels. These methods are generally rapid, but, as mentioned earlier, they often produce much damage to the surface of the cut which requires time and material to remove. Other problems with these methods are encountered. For example, the diameter of an abrasive or diamond disk saw required for a cut is always twice the size of the specimen plus the diameters of the flanges holding the disk.
Also, the grit had a tendency to fallout of the mount if much grinding was required. Probably the most popular filler now in use for edge retention is pelletized alumina, shown in Figure 15. This filler is available in three hardness grades and in two mesh sizes for matching to the sample hardness and shape. This material is now available in black as well as white. When the black alumina is used in conjunction with a mounting resin to which black die has been added, it is very effective in reducing reflected light from the mount surface.
This technique is effective if a completely conductive mount face is not desired. For example, in a vacuum cathodic etcher, arcing can occur if the entire mount is conductive. This application of the technique was also described by Dobbins (54). DELMAR V. MILEY AND ARTHUR E. CALABRA 32 Figure 17. The use of copper-filled diallyl phthalate to achieve a conductive mount face. Mount Marking It may be appropriate to conclude this discussion of mounting methods with a few brief comments on the marking of mounts for identification.