Proc. SPIE. 5179, Optical Materials and Structures Technologies
KEYWORDS: Cryogenics, Beryllium, Electroluminescence, Space telescopes, Mirrors, Temperature metrology, Mechanical engineering, Aerospace engineering, Electro optical systems, James Webb Space Telescope
Ultimate tensile strength, yield strength, and elongation were obtained for the aluminum-beryllium alloy, AlBeMet162 (38%Al-62%Be), at cryogenic [(-195.5°C (-320°F) and (-252.8°C) (-423°F)] temperatures, and for an optical grade beryllium, O-30H (99%Be), at -252.8°C. AlBeMet162 material was purchased to the requirements of SAE-AMS7912, "Aluminum-Beryllium Alloy, Extrusions." O-30H material was purchased to the requirements of Brush Wellman Inc. specification O-30H Optical Grade Beryllium. The ultimate tensile and yield strengths for extruded AlBeMet162 material increased with decreasing temperature, and the percent elongation decreased with decreasing temperature. Design properties for the ultimate tensile strength, yield strength, and percent elongation for extruded AlBeMet162 were generated. It was not possible to distinguish a difference in the room and cryogenic ultimate strength for the hot isostatically pressed (HIP'ed) O-30H material. The O30H elongation decreased with decreasing temperature.