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FAQs about ALLVAR

Yes!  ALLVAR Alloys are titanium-based alloys and are corrosion-resistant, non-magnetic, and can be welded to Ti-6-4 and other ALLVAR Alloy components 

Currently, we provide:

  • Solid bar up to 2 1/2″ round
  • Tube up to 3″ OD, depending on the wall thickness
  • Rod as small as 1/8″ diameter
  • Constant force-load washers for fasteners in temperature variant environments

Yes. ALLVAR Alloys machine like titanium; they can be machined into rods, struts, tubes or other custom components. 

No. Additional processing is not needed.No. Additional processing is not needed to achieve ALLVAR Alloys’ signature negative thermal expansion capabilities. 

ALLVAR Alloys have similar magnetic properties to other titanium-based alloys, which are generally considered non-magnetic.

Not yet, but ALLVAR has worked on multiple NASA SBIR projects to bring these negative thermal expansion alloys to space. You can read more about those projects hereor contact us to see what we can do in space.  

Since ALLVAR Alloys are made of true metals, they behave like all other metals do in a vacuum. There is no moisture or other material component that would cause problems from outgassing. 

Yes!  We have successfully welded ALLVAR Alloys to Ti-6-4 and other ALLVAR pieces. 

ALLVAR Alloy 30 operates from cryogenic temperatures to 100 °C.

The newer developed ALLVAR Alloy HT has a higher operating temperature of 250°C.

Let us know if you have an application that exists outside of this range, we are materials scientists at heart and would love the opportunity to develop a higher temperature NTE alloy.

No.  ALLVAR is anisotropic, meaning if the bar shrinks in length, it will grow in the radial direction.  The growth is consistent and runs about 2 ppm/°C more than the shrinkage in the length.  For example, if the ALLVAR bar has a negative 30 ppm/°C in the length, it will have a positive 32 ppm/°C in the radial. 

 ALLVAR Alloys are corrosion resistant. They’re titaniumbased and alloying elements have corrosion resistance comparable to titanium

We have never coated it ourselves, but we have been told it can be coated like titanium.  

We have never polished it. But it will polish like titanium, which, we have been told, is a bit gummy. 

While we have not studied this directly, we have never observed a change in CTE characteristics or performance during the normal handling experienced in a machine shop environment. 

No.  ALLVAR alloys do not absorb moisture from the surrounding environment.

ALLVAR Alloys can definitely be used to achieve zero linear thermal expansion. Negative thermal expansion ALLVAR Alloys can compensate for the positive thermal expansion along an axial direction. With simple calculations, the CTE of an assembly can be tuned to a specific value– whether negative, positive, or zero CTE. Learn more in this video.

Engineers have joked that a negative thermal expansion material has been unobtanium for them. We are pleased to announce that ALLVAR Alloys are not unobtanium! We can provide these unique negative thermal expansion ALLVAR Alloys for your project today.