Investigation of low-temperature creep in two titanium alloys Final report
Creep and tensile properties of 5Al-2.5Sn and 6Al-4V titanium alloys
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Creep and tensile properties of 5Al-2.5Sn and 6Al-4V titanium alloys
Fabrication of light weight aluminum alloys for cryogenic applications
Solar energy transmission measurements of plastic films used as solar cells for weather balloons
Simulated hydrogen leakage in electrolytic hydrogen-oxygen fuel cells
Fermi surface topology effects on Nernst- Ettingshausen coefficient from measurements in magnetic fields to 3.3 tesla and 1.2-4.2 K temperatures in metallic tin
IR absorptance of CO below room temperature, determining strength and half widths of lines in R branch of fundamental band
Transient recombination lifetimes in n-type float zone Si from 4.2 K to room temperature, obtaining electrical and photoconductivity values
Engineering alloys electrical resistivities measurement at various temperatures, noting temperature and heat treatment effects
Radiation resistant material, made of polyimide polymers and S-glass cloth, is used in ball bearing retainers for extreme environments. Material displays satisfactory wear resistance, lubricity, and stability. Results of comparative tests with fluorocarbon materials are given.
Method developed employs high pressure combined with strong vacuum force to compact ablation models into desired conical shape. Technique eliminates vapor hazard and results in high material density providing excellent structural integrity.
Helium is used for purging and pressurizing cryogenic rocket propellants, welding, atmosphere control, leak detection, and refrigeration. It provides the lowest possible liquid-bath temperature and produces superconductivity in certain materials. Its superfluid effects are used in superconducting magnets.
High speed, automated system accurately measures to approximately one percent in three minutes. System identifies materials having constant thermal or electric conductivity, predicts new material properties, develops alloys in accordance with desired specifications, and develops nondestructive devices for measuring precipitation hardening.
Using photodielectric effect to detect densities of free and trapped carriers in II-VI compounds at cryogenic temperatures
Cryostat for flexure fatigue testing of composite materials
High strength aluminum casting alloy for cryogenic applications in aerospace engineering
Thermal and electrical transport in tungsten crystal for strong magnetic fields and liquid helium temperatures
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Cold performance tests and startup tests were conducted on the Brayton-cycle inverter, motor-driven pump, dc supply, speed control with parasitic load resistor and the Brayton control system. These tests were performed with the components in a vacuum and mounted on coldplates. A temperature range of ?25 to -50 C was used for the tests. No failures occurred, and component performance gave no indication that there would be any problem with the safe operation of the Brayton power generating system.