Microstructures
by
George
Langford, Sc.D., Massachusetts Institute of Technology, Cambridge, MA,
1966
Copyright©2005 by George Langford
Non Ferrous Alloys - Lesson 4 -
Fifth specimen
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This is the same alloy as the previous specimen, but it has
been heat treated subsequently. Examine both photomicrographs
carefully to find out what microstructural changes have taken
place. The image at left was made at 50X; and the photomicrograph
below it was made at 200X. Keller's etch was used again.
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Form an opinion before proceeding to the explanation.
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The precipitated impurities have
been dissolved, the alpha etches more smoothly, and the coring has
disappeared.
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