Aluminum Tested at 100ksi UTS 1

[CHagen]

Hi all,
I recently had an aluminum sample tested for composition and tensile strength. The composition looked close to 7050, but just slightly off. The tensile was much higher than I expected or am aware of how to achieve. This was a tube more or less (image attached).

How do you achieve these strengths from this aluminum?

I am also trying to find a similar alloy to in tube form. Any trusted resources to find tube forms in this material (7050)? Would it make more sense to speak to an extruder? Is it possible this was forged and finish machined?


Tensile testing was performed per ASTM E8-24 and ASTM B557-17 using a Satec Systems Model: Apex
22EMF, S/N: 1017, with a calibration due date of 04/04/2025. Testing was performed on 10/14/2024.

 

[EdStainless]

First, if your analysis is high precision then this is 7050.
There is a tolerance for the product analysis vs the standard chemistry.
When they did the tensile test did they cut a strip sample or test the tube?
What makes me suspicious is the high UTS and good elongation.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

 

[CHagen]

EdStainless,
In the image it shows the strip was machined from it (lengthwise strip) 0.2500" wide and 0.1200" thick. My thoughts exactly. I want to ask for a graph (not provided).

 

[mrfailure]

When you cut a strip out, it then has to be flattened to pull the tensile unless your wall is thick enough to machine a flat. This can skew results. With a tube like this, I prefer to test it full cross-section if possible.

 

[CHagen]

It is a flat section machined from the bottom of the tube where it is thick.

 

[WKTaylor]

Observation... RE photo of that extremely dirty/worn shaft... where I assume the 'test coupon' was cut-from...

With such high ultimate and yield values... just a-very-few-%-apart... is it possible that there is some unaccounted-for 'strain-hardening'... tensile or compressive... that occurred, while in-service?



Regards, Wil Taylor
o Trust - But Verify!
o For those who believe, no proof is required; for those who cannot believe, no proof is possible. [variation, Stuart Chase]
o Unfortunately, in science what You 'believe' is irrelevant. ["Orion", HBA forum]
o Only fools and charlatans know everything and understand everything." -Anton Chekhov