Heat treat of Aluminum 6061 T6 first anealing and then tempering and
case hardening?
1. How do I aneal (stress relieve) a machined part made of 6061 T6
Aluminum? I need this, so then I coul be able to cut out a big section
out of it, hoping that the remaining of the part won't worp too much?
(It's a small part with thin walls)
I am looking for an answer of the format: Step One: Heat up the part
to XXX degree degree Fahrenheit for YYY hours and air cool (or: let it
cool to room temperature overnight). Step Two: then heat it up to ZZZ
F for XXX Hrs. and air cool (or: let it cool to room temperature
overnight)
2. How do I heat treat (I'd say "harden" if it was a steel part) In
other words how can I put back the T6 temper into the now soft
aluminum? I need that so the so heat treated part would have some
elasticity. It should be able to spring at least a little (as oposed
to to remain bended) when I squise it a little.
3. Can I case harden the part?

I'll help you a little. You can't "case harden" aluminum or any aluminum alloys.