8,202 Result(s)
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Materials Science
Materials Science, general
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Article
Temperature Effects on Internal Stress in Molybdenum Thin Films on Single-Crystal Silicon Substrates
Molybdenum thin films were deposited with an electron beam gun onto (100)-oriented silicon substrates. The samples were then annealed in vacuum, and the internal stresses in the molybdenum thin films were stud...
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Improvement of Thermal Fatigue Resistance of a Wrought Nickel-Base Superalloy by Laserglaze
Laserglaze with appropriate post heat treatment has improved the thermal fatigue resistance of a wrought nickel-base superalloy. It was found that laserglaze was able to eliminate the blocky MC phase, refine g...
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Comparison of Wear Resistance of Ion Implanted Surgical Ti-6Al-4V with Other Alloys
The wear resistance of N-ion implanted titanium, N-ion implanted Ti-6Al-4V alloy, ion plated Ti-6A1-4V, ion nitrided Ti-6Al-4V and surgical Co-Cr-Mo alloy were studied. All were studied under similar condition...
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Microstructure and Wear Behavior of Laser Processed Co-Cr-W/Steel Surface Alloys
Surface alloys with various compositions of Co, Cr and W on 20CrMo steel have been processed by controlling the ratio of thickness of plasma sprayed Co-Cr-W coating to laser melting depth. A formula has been s...
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Fatigue Properties of a Ni-Base Superalloy Treated by Laserolazing
Fatigue properties of a wrought Ni-base superalloy treated by laserglazing and post heat treatments have been investigated. Tests have been run both by the rotating bend fatigue at 700°C and the vibration fati...
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The Effect of Sodium Catalyst Dispersion on the Carbon Dioxide Gasification Rate
The CO2 gasification rate of black liquor char (b1c) is studied in a thermogravimetric analysis set-up at temperatures between 600 to 800° C. B1c is prepared via fast pyrolysis of the dry solids in spent liquor o...
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Structure and Tc of La1−xYbxBa2Cu3O7-y Layered Perovskite Superconductors
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X-ray Topography and EBIC Studies of Misfit Dislocations in Strained Layer Structures
X-ray topography(XRT) and EBIC have been used to study the generation of misfit dislocations in strained layer structures. Two structures studied were GaAs1−yPy(y=0.15) film and SLS consisting of InxGa1−xAs(x=0.0...
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Raman Spectra of Ion Intercalated Vermiculites
The Raman spectra of ion intercalated Vermiculites have been studied. The torsional mode frequencies exhibit a shift to higher energy with increasing basal spacing d. Using a van der Waals type force model, an...
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Systematic Composition Studies on the Durability of Waste Glass WV205
A systematic study of the chemical durability of glass compositions developed for the immobilization of high-level radioactive wastes at West Valley is described. Most of the compositions studied here represen...
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A new type of brittle fracture in a fcc metal bicrystal with intergranular segregation
A new type of brittle fracture was discovered in a Cu–Bi alloy bicrystal with a random misorientation interface. Macroscopically, fracture occurred along the interface with a low-energy release rate of order 5...
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EXAFS study of polymorphs of manganese dioxides
An attempt has been made to use extended X-ray absorption fine structure (EXAFS) to study the polymorphs (beta, gamma and alpha types, and ramsdellite) of manganese dioxides. The ratio of (1 × 1) tunnels to (1...
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The Misorientation Dependence of the Fracture Behavior of F.C.C. Metal Bicrystals
The ductile versus brittle response of Cu bicrystal interfaces with different misorientations and Bi segregation levels has been investigated. The fracture behavior of the bicrystals and the morphology of the ...
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In Situ Hvem Study of Ion Irradiation-Induced Grain Growth in Au Thin Films
In situ observations of 1.5 MeV Xe+ ion irradiated Au films at room temperature and at 150°C reveal the evolution of grain growth: the average grain size increases by the mechanisms of grain boundary migration an...
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Crack-Tip Shielding in Metal-Matrix Composites: Modelling Of Crack Bridging by Uncracked Ligaments
As part of an investigation into the micro-mechanisms of crack-tip shielding associated with the growth of fatigue cracks in metal-matrix composites, simple models are developed for the role of crack bridging ...
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Thermally and Ion-Induced Reactions of Metal with CuO Substrate
Thermally and ion-induced reactions of transition metals Zr,Ti,Cr and Ag with CuO substrates have been studied by Rutherford backscattering spectrometry and X-ray diffraction techniques. Reactions resulted in ...
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Electrostatic Models of Relaxation at Metal Surfaces
The physical basis for electrostatic models of relaxation at metal surfaces, including the meaning of the two parameters of the modified point-ion or α model, is discussed. The empirical α parameter is shown t...
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Investigation of Titanium Nitride Synthesized by Ion Beam Enhanced Deposition
Titanium nitride films have been synthesized at room temperature by alternate deposition of titanium and bombardment by nitrogen ions with an energy of 40KeV. The component depth profiles and the structure of ...
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Determination of Relative Number Densities and Quenching Rates of Sodium in an Atmospheric Flame by Asynchronous Optical Sampling
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Nonlinear Elasticity of Poly (P-Phenylene Benzobisthiazole) (PBZT) Fibers
We have developed a method which uses laser-generated ultrasound to measure the Young’s modulus of fibers as a function of temperature and static tensile stress. For fibers of PBZT, measurements have been made...
