2
$\begingroup$

I've been looking at using Aluminium 6082-T6 structures in impact energy absorption mechanisms. I planned to do some material testing, made specimens for testing then was distracted with another project for about a year. When I finally tested these specimens they broke in a surprisingly brittle manner with a much higher than expected proof stress.

I'm wondering whether 6082-T6 is an alloy that age hardens at room temperature as one of the technicians suggested this as the cause. If so, does anyone know of any studies into this phenomenon?

This is would be rather important for impact energy absorption as increasing proof stress can result in higher risk of fatality.

$\endgroup$
2
$\begingroup$

Just leaving the alloy sitting on a shelf for a year at room temperature shouldn't have any effect on it.

However, 6082-T6 "as supplied" has already been heat treated and artificially aged. That's what the -T6 temper designation means.

If you wanted "soft" ductile material for energy absorption, maybe you should have used 6082-O (or some other temper designation) instead of -T6.

Another possibility is that the manufacturing operations to make your test specimens affected the state of the material, and the finished specimens should have been heat treated again.

$\endgroup$
  • $\begingroup$ Thank you, I'll have to do some further testing and look at 6082-O as well. $\endgroup$ – Era Dec 17 '16 at 13:50

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.