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Old 01-16-2020, 02:16 PM
dwmh dwmh is offline
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Default 1100 Aluminium annealing question

Sorry for the dumb question and English spelling, but does 1100 (pure) aluminium age harden like the higher strength alloys do, after it has been annealed. i have always thought it only work hardened, but would like to hear from someone that knows.
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Old 01-16-2020, 05:21 PM
Ken Hosford Ken Hosford is offline
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I think you will be hard pressed to work harden 1100 al.
no it does not age harden
these are the beauties and buggers about 1100
it is soft so it works easy but it does not know to stop.
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Old 01-16-2020, 11:47 PM
crystallographic crystallographic is offline
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Quote:
Originally Posted by dwmh View Post
Sorry for the dumb question and English spelling, but does 1100 (pure) aluminium age harden like the higher strength alloys do, after it has been annealed. i have always thought it only work hardened, but would like to hear from someone that knows.
It'll be a sad day when we stop learning.

Ken is correct - 1100 alloy only work hardens. Annealing it is a permanent change, not related at all to aging.
If you just look at the letter designating hardness: "T" or "H" - you will know immediately that "H" signifies only work hardening (Hammering),
and "T" signifies thermal hardening through precipitation, or aging.
Yes, both alloy groups may be work hardened, but the full tensile strength of the "T" group is only obtained thermally.
(psst, no such thing as a dumb question - you remain dumb only by not asking...)
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Old 01-17-2020, 03:33 AM
dwmh dwmh is offline
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Thank you Ken and Kent you confirmed what i had thought. I should reread Kent's website articles on aluminum, because I didn't realize the full meaning of the 'T' and the 'H' in the material spec as pointed out here.
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Old 01-18-2020, 01:12 PM
crystallographic crystallographic is offline
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Thank you Ken and Kent you confirmed what i had thought. I should reread Kent's website articles on aluminum, because I didn't realize the full meaning of the 'T' and the 'H' in the material spec as pointed out here.

Thanks for the reminder, David.
Here is one article, on aircraft aluminum alloys, and has the "H" and "T" groups covered, as David referenced.

https://www.tinmantech.com/education...num-alloys.php


and a few other articles on metal working:
https://www.tinmantech.com/education/articles/
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