by George Langford, Sc.D., Massachusetts Institute of Technology, Cambridge, MA, 1966
2005 by George Langford
This is the third lesson in a set of images prepared by me that demonstrate metallurgical microstructures found in the M.I.T. specimen collection.  These microstructures are more complex than those shown in the first two groups.  Compare them carefully, and use the phase diagrams to interpret the squence of treatments or phase changes. 
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.
Whenever the narrator asks a question, be sure to commit yourself to an answer before going to the next page.  You can backtrack with your browser's BACK button at any time, of course.  Just be sure to click the FORWARD button to return to the proper page before proceeding so that you don't get lost.