SEARCH · Search NASA
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.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Unidirectionally solidified Al eutectic alloy behavior as fiber reinforced composite material, discussing fatigue fracture under cyclic loading
Spectrographic method determines individual stainless steel components in molten bismuth-42 w/o tin eutectic to determine the solubility of Type 304 stainless steels. It utilizes the high sensitivity and precision of the spark-ignited, low-voltage ac-arc excitation of samples rendered homogeneous by dissolution.
Eutectic modified cobalt tungsten chromium alloy for chill casting
Fatigue characteristics of unidirectionally solidified Al-intermetallic aluminum nickel eutectic alloy consisting of discontinuous Al-Ni intermettalic whiskers in Al matrix
Microstructure and crystallography of lamellar eutectic alloy of Ni and intermetallic Ni-Ti compound
Crystal microstructure and mechanical properties of unidirectionally solidified Ni-Ni-Nb intermetallic eutectic alloy at high temperature, examining deformation and fracture modes
Temperature effects on mechanical properties and fracture behavior of lamellar Ni-nickel titanide intermetallic eutectic alloy showing dependence on intermetallic constituent
Contact preparation at low temperatures is possible with the use of a copper-titanium eutectic alloy. Contacts formed with this alloy are ohmic on p-type silicon carbide and rectifying on n-type.
Solidification, structure, and properties of nickel and niobium eutectic alloys
Monotonic and cyclic mechanical response of nickel-nickel niobium eutectic alloy to tensile, compressive and fatigue testing
High temperature friction and wear characteristics of self lubricating composite disks of sintered tungsten, molybdenum, and cobalt molybdenum, impregnated with fluoride eutectic
Solidification, structure, and properties of eutectic alloys including consideration of properties control
Ni-Ni Nb eutectic composite, investigating monotonic mechanical response, deformation and fracture mechanisms
Banding observed in unidirectional solidification of eutectic alloys is shown to be due to melting back of the freezing interface because of oscillations in the temperature of the furnace. General theoretical criteria as to the amplitude and frequency of the permissible temperature oscillations are given to ensure that banding will not occur.
Eutectic mixture of aluminum oxide and zirconium oxide provides new bonding technique for sapphires and rubies. Technique effectively reduces possibility of contamination. Bonding material is aluminum oxide and zirconium oxide mixture that matches coefficient of thermal expansion of sapphire.
The suitability of the eutectics for high temperature fasteners was investigated. Material properties were determined as a function of temperature, and included shear parallel and perpendicular to the growth direction and torsion parallel to it. Techniques for fabricating typical fastener shapes included grinding, creep forming, and direct casting. Both lamellar Ni3Al-Ni3Nb and fibrous (Co,Cr,Al)-(Cr,Co)7C3 alloys showed promise as candidate materials for high temperature fastener applications. A brief evaluation of the performance of the best fabricated fastener design was made.
Thermotransport (or thermal diffusion, Soret effect) is shown to cause significant amount of segregation during the directional solidification of aluminum-copper eutectic. The concentration changes are predicted quantitatively and they are a function of temperature gradient, rate of melting and solidification and the time of soaking. There is a fair agreement between the experiments and calculations. A process is suggested where these concentration changes may be minimized.
Continuous and discontinuous NaF fibers, embedded in a NaCl matrix, have been produced in space and on earth, respectively. The production of continuous fibers in a eutectic mixture was attributed to the absence of convection current in the liquid during solidification in space. Image transmission and optical transmittance measurements of transverse sections of the space-grown and earth-grown ingots were made with a light microscope and a spectrometer. It was found that better optical properties were obtained from samples grown in space. This was attributed to a better alignment of NaF fibers along the ingot axis.