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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Reinforcing aluminum, aluminum alloys, and ductile epoxies with short, brittle fibers and high modulus filaments, and boron carbide whisker growth
Chromium alloys with good low temperature ductility and superplasticity
Boron carbide whiskers for reinforcing brittle fibers of aluminum, aluminum alloys, or ductile epoxies
Role of chemical reactions in comminution mechanism of ductile metals into ultrafine powders by grinding
Ductility ratio data for high strength titanium alloys from specially designed experiments and notch strength tests
Reduction of ductile-to-brittle transition temperature for unalloyed chromium achieved in alloys resembling Cr-Re system
To produce high strength alloy steel with retention of ductility, include tempering, cooling and subsequent tempering. Five parameters for optimum results are pretempering temperature, amount of strain, strain rate, temperature during strain, and retempering temperature.
Development and testing of ductile niobium alloy with silicide coating for rocket engine combustion chamber
Ductilizing of Group 6A elements by rhenium and other solutes
Reinforcement of ductile aluminum and epoxies with brittle high modulus filaments
Development of ductile oxidation-resistant cladding alloys for thoria dispersion, strengthened nickel and nickel-chromium
Ductile metal powder chemical reactions during comminution in pure or oxygenated water
Ductile fracture of polymers under stresses
Reactor irradiation effects on ductile brittle transition and stress-strain behavior of tungsten
Analytical and experimental investigation of ductile fracture of polymers using adaptation of Dugdale model
Anisotropic materials ductile fracture involving crack initation and propagation, using Dugdale mathematical model
Fatigue process analysis through crack initiation and propagation and final fracture, considering ductility, tensile strength and fracture toughness roles
Bend angles for columbium-base alloys, WC3015 and Cb752, at temperatures between -300 F and +500 F are reported. WC3015 exhibited a bend transition temperature well below -100 F, but was severely embrittled by silicide coatings. Cb 752 exhibited a bend transition temperature below -300 F, and the silicide coating application did not influence bend angle of the substrate. However, coating failure on both alloys was observed at less than 60 deg bend, even at 500 F. The effect of electron beam welding and gas tungsten-arc welding on the properties of WC3015 and Cb752 are also reported. Both techniques are shown to produce a marked reduction in the bend angle of WC3015. Unlike WC3015, ductility is restored in Cb752 after a suitable postweld anneal. Microstructural and hardness tests results for both alloys are reported and discussed.