As Uncle Al has said repeatedly on this forum: "Six months in the lab
will save you an afternoon in the library."
Get off the web and go to your friendly local engineering library at a
university. Look up the section on metallography of aluminum alloys
in the ASM Handbook. It is in Volume 9, Metallography and
Microstructures. This used to be called the Metals Handbook. In the
9th edition of the Metals Handbook you want to look in Volume 9 on
pages 351 to 361 (see 0.5% HF etch pitctures of Al 1100). I don't
have the newest ASM handbook handy, just the red 9th edition.
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