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Al-Li 2000 series alloy out gassing Studies at IIT

Al-Li 2000 series alloy out gassing Studies at IIT. N. Solomey, Physics Division Philippe Nash, Material Science Division 21 Feb. 2003. Current knowledge of Al-Li 2195. NASA has extensive knowledge and many internal reports for this alloy for: Welding Cryogenic

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Al-Li 2000 series alloy out gassing Studies at IIT

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  1. Al-Li 2000 series alloy out gassing Studies at IIT N. Solomey, Physics Division Philippe Nash, Material Science Division 21 Feb. 2003

  2. Current knowledge of Al-Li 2195 • NASA has extensive knowledge and many internal reports for this alloy for: • Welding • Cryogenic • There is no known knowledge about: • Out gassing with first use of the alloy • Thin wall structures for vacuum to air, hydrogen or liquid cryogenics. • Radiation damage.

  3. We are using the Molly Furnace in P. Nash’s Lab at IIT • Large volume vacuum tank • Can quickly achieve 1x10-7 Torr (lower if we pump longer) • Has a special painted interior with low out gassing characteristics • Water cooled vessel and support stand so that just the sample can be heated to 1250° F.

  4. This is a study of out gassing by: pumping on the sample to see how low vacuum can be reached shape of the curve while pumping out gassing after reaching a vacuum will increase pressure This is not a study of suitability of these materials for: window to air, gaseous hydrogen or helium, and to liquid hydrogen or helium Want to study only out gassing

  5. Sample Preparation • Six samples number 1 through 6 of various types of Al alloys 1 in2 were machined by Ole Miss. Univ. and send to us. We do not know what sample is which alloys. • Each sample was cleaned with Ethyl alcohol and stored in a clean tray and handled with gloves. • The Molly Furnace was baked out for 3 days at 1200 F.

  6. Studies First Conclusions: • Preliminary results are that we see a slight difference between the samples and an empty tank. • P. Nash suggest we consider: • Heating samples to 25% to 50% of melting point to enhance out gassing. • Grind up the samples to small pieces making a larger surface area to enhance out gassing. • Put a residual gas analyzer on the vacuum pump to see what is coming off.

  7. Other Interest: • Our main interest is: • Out gassing during first use of these alloys so we do not contaminated interior of accelerating cavity. • Suitability of these new alloys for use as thin windows with liquid hydrogen or helium on other side. • NASA has an interest in these 2000 series Al-Li alloys for radiation studies. This is also of interest to us.

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