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Showing 1 to 16 of 16 for “"Ni-W"”.
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Electrodeposition of amorphous matrix Ni-W/Wp̳ composites
An amorphous Ni-W alloy matrix was incorporated with W particulate through two types of electrodeposition. The plating bath for the electrodeposition contained nickel sulfate, sodium tungstate, sodium citrate, ammonium chloride, and a variable amount of 1 gm tungsten particulate ranging in …
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Grain size control and microstructural evolution in nanocrystalline Ni-W alloys
… exploits this concept in the nanocrystalline Ni-W system. Atomistic computer simulations are used to evaluate the potential for stabilization based on the equilibrium solute distribution and energetics of nanocrystalline structures. Following this, a synthesis technique based on …
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Structure and Processing Relations in Ni-W Amorphous Particle Strengthened Ni Matrix Composites
… interfacial bonding. It is conceivable that significant additional strengthening in amorphous reinforced composites can be realized by creating high-aspect ratio reinforcements; attritor milling holds promise in this regard. In this work, mechanical alloying was used to produce equimolar Ni-W …
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A technical and marketing analysis of nanocrystalline Ni-W coating for oil and gas industry applications
Nanocrystalline nickel-tungsten is a new metallic coating technology developed at MIT in the laboratory of Professor Christopher Schuh in 2005. The new coating technology utilizes a special electrodeposition process to achieve precise control of synthesized nanocrystalline coating structure and …
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Nanocrystalline alloys : enhanced strengthening mechanisms and mechanically-driven structural evolution
… properties. In particular, nanocrystalline mechanical behavior has been of interest, as incredible strengths are predicted when grain size is reduced to the nanometer range. The vast majority of research to this point has focused on quantifying and understanding the grain size-dependence of …
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Treatment of Early Intervention for Acute Low Back Pain Patients Utilizing a "Back-To-Work Transition" Component: A One-Year Prospective Study
… with ALBP were at high-risk for developing chronic pain and then implemented an interdisciplinary early intervention program in order to prevent the progression of ALBP to chronic low back pain (CLBP). The aforementioned authors were able to demonstrate the effectiveness of the …
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Parameter analysis of copper-nickel-tungsten prepared via powder metallurgy process for electrical discharge machining of polycrystalline diamond
… research presents the works in production of Cu-Ni-W electrode by powder metallurgy route. Production of powder metallurgy parts involve mixing of the powder with additives or lubricants, compacting the mixture and heating the green compacts in an Argon gas furnace so the particle bond to each …
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Irradiation-induced nanoclusters and their evolution in compound forming ni-base and cu-base alloys
… precipitates are actively studied for designing materials tolerant to irradiation at high temperatures. The challenge is that nanostructures will often coarsen under elevated temperature irradiation or annealing, owing in part to radiation-enhanced diffusion. In this thesis, we propose a …
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Biofuels Production Via Catalytic Hydrocracking Of Ddgs Corn Oil And Hydrothermal Decarboxylation Of Oleic Acid Over Transition Metal Carbides Supported On Al-Sba-15
<p>The purpose of this research is to minimize the gap between the production of biofuels and the production of petroleum-based fuels by developing catalysts that can utilize renewable non-food based feedstocks (waste vegetable oils, algal oil, brown grease, etc.) and have great performance under …
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Residual stress in nanocrystalline nickel tungsten electrodeposits
… nanocrystalline electrodeposits poses several unique challenges due to their fine grain structure, thickness distribution, and matte surface. We employ a three-dimensional profilometry-based approach that addresses each of these complicating factors and enables quantitative analysis of residual …
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Atomistic computer simulation analysis of nanocrystalline nickel-tungsten alloys
Nanocrystalline nickel-tungsten alloys are harder, stronger, more resistant to degradation, and safer to electrodeposit than chromium. Atomistic computer simulations have previously met with success in replicating the energetic and atomic conditions of physical systems with 2-4nm grain diameters. …
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Nanoscale self-organization in irradiated ternary alloys
… even stronger resistance to thermal coarsening, which is rationalized by the very high trapping efficiency of ramified W cores for Nb atoms. 2) In the Cu-Ag-W system, where Ag is moderately immiscible with Cu and is highly immiscible with W, compositional patterning, as a steady state of …
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Early Intervention Options for Acute Low Back Pain Patients: A Prospective One-Year Follow-Up Study
… of acute low back pain (ALBP) patients using techniques designed to address the psychosocial, as well as physical, aspects of pain. Initially, an algorithm was developed by Gatchel et al. (1995a) to identify patients suffering from ALBP who were at high-risk for developing chronic low back pain …
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Nanostructure stabilization and mechanical behavior of binary nanocrystalline alloys
The unique mechanical behavior of nanocrystalline metals has become of great interest in recent years, owing to both their remarkable strength and the emergence of new deformation physics at the nanoscale. Of particular interest has been the breakdown in Hall-Petch strength scaling, which is …
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Base material electrocatalysts for oxygen cathodes in low temperature acid fuel cells
… stability in the acidic electrolytes and electronic conductivity. However, Pt is expensive, in limited supply and only electrocatalyses the oxygen reduction reaction at overpotentials of at least 0.1 V. The importance of research into substitutes for Pt-based oxygen reduction electrocatalysts is …