by George Langford, Sc.D., Massachusetts Institute of Technology, Cambridge, MA, 1966
2005 by George Langford
This set of photomicrographs that I made of this group of specimens in the M.I.T. collection shows a wider range of microstructures and properties than the group in Lesson 1.  Whether intentionally or not, the heat treatments did not always produce desirable results.  Many of these failures of heat treatment can be modified by repeating or altering the heat treatment.  That is why they are of particular interest to physical metallurgists and why an understanding of the kinetics of these phase changes is so important.
Allow plenty of time to study and to take good notes about each specimen.  About two hours per lesson would be appropriate.  You will be expected to interpret some of these specimens during the final examination.  Feel free to use the Internet to find additional information about the alloys and applications mentioned here.
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