|
INTRODUCTION - Lesson 4
This is the fourth lesson in a set of images
that I made that demonstrate
metallurgical
microstructures in the specimens in the M.I.T. collection. This
is the last of the non-ferrous
specimens. This lesson is entirely about aluminum alloys.
Since aluminum generally holds less solute than iron orcopper, there
are a lot of extraneous inclusions and other more or less desirable
phases. The KA-135 color transparency film had a color
temperature problem, so I have had to adjust the color balance of all
the images. The aluminum itself looks off-white to light grey
through the microscope, and the silicon looks a dark grey to blue
grey. Other colors are artifacts in these images. |
| 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. |
| FIRST
SPECIMEN |