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Technical Discussions
Ron Olson
R & D, Aviation
The Best Aviation Company In The World, USA, Joined Feb 2005, 24

Ron Olson

R & D, Aviation
The Best Aviation Company In The World,
USA,
Joined Feb 2005
24
04:52 Sep-29-2005
Metals and Conductivity

Can an unknown aluminum alloy be strictly determined by conductivity? Thank you.


 
 Reply 
 
Joe Buckley
Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT, United Kingdom, Joined Oct 1999, 528

Joe Buckley

Consultant, ASNT L-III, Honorary Secretary of BINDT
Level X NDT, BINDT,
United Kingdom,
Joined Oct 1999
528
00:42 Oct-01-2005
Re: Metals and Conductivity
Simple answer: No
Typically Aluminium Alloys cover quite a range of conductivity depending on Heat treatment state.

The relationship between heat treatment and conductivity is complex: Many alloys (e.g. the common 7075 type) follow a circular curve with heat treatment/work - Even knowing the alloy composition you cannot reliably tell the full state from conductivity - often need hardness as well.

What you can do is use conductivity as a check- If an alloy has the conductivity you expect it is 'likely to be correct', or more precisely, if it is different something is wrong, but you cant work back to deduce much, with a high degree of certainty, if you only know conductivity.

If you can make a few more assumptions it becomes a lot more useful. Typically a shop may only work with a few different alloys, so conductivity can be used to check which one you have.

If you 'know nothing' you need hardness and PMI checks as well

Joe


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: Can an unknown aluminum alloy be strictly determined by conductivity? Thank you.
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 Reply 
 
Carl Berrojo
Carl Berrojo
05:32 Oct-02-2005
Re: Metals and Conductivity
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: Can an unknown aluminum alloy be strictly determined by conductivity? Thank you.
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No, due to the overlapping conductivity values of aluminum alloys (ie. 2024-T3 is 28%-32% IACS and 7075-T6 is 30%-35% IACS). Normally, you would identify the alloy with acid testing (we use kits provided for this purpose by Scientific Systems Laboratories), then use the conductivity value to determine the temper (heat treat condition).





 
 Reply 
 
S.V.Swamy
Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex , India, Joined Feb 2001, 787

S.V.Swamy

Engineering, - Material Testing Inspection & Quality Control
Retired from Nuclear Fuel Complex ,
India,
Joined Feb 2001
787
02:13 Oct-02-2005
Re: Metals and Conductivity
Dear Ron,

No. The conductivity is just one of several parameters. You will need a spectro or XRF spot analysis, if you don't want to cut a piece and send it for conventional chemical analysis. Strength and hardness data will tell you about heat treatment.

Swamy

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: Can an unknown aluminum alloy be strictly determined by conductivity? Thank you.
------------ End Original Message ------------




 
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