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Showing 1 to 19 of 19 for “"nanocrystalline alloys"”.
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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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Nanocrystalline alloys : enhanced strengthening mechanisms and mechanically-driven structural evolution
Nanocrystalline materials have experienced a great deal of attention in recent years, largely due to their impressive array of physical properties. In particular, nanocrystalline mechanical behavior has been of interest, as incredible strengths are predicted when grain size is reduced to the …
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Phase evolutions and steady state diagrams in ion irradiated nanocrystalline alloys
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-12-01
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Synthesis and characterization of nanocrystalline alloys in the binary Ni-Co system/
Nanocrystalline Ni-Co alloys were synthesized using pulsed electrodeposition from a Watts-type bath, and the various plating parameters were systematically varied to examine their effect on the composition, quality, and structure of the resulting deposits. Increasing the pH of the plating bath …
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Stability of nanostructured : amorphous aluminum-manganese alloys
Nanocrystalline alloys have attracted interest for decades because of their improved mechanical strength without sacrificing ductility, but structural stability has always been an issue. In this work, bulk aluminum-manganese (Al-Mn) nanocrystalline alloys have been synthesized using room …
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Evaluating the Thermal Stability of Nanocrystalline Ag-Cu Alloys
Nanocrystalline alloys offer multitudinous advantages over their larger-grained counterparts including increased strength, hardness, resistance to fatigue, and more. However a significant barrier to their implementation is their low thermal stability—they are prone to coarsening at very low …
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Design of stable nanostructure configurations in ternary alloys
The development of stable nanocrystalline binary alloys, which possess a large volume fraction of grain boundaries at elevated temperatures, is a promising route to high yield strength materials. Previous studies have focused on alloying by selecting solute elements that segregate at grain …
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Variations in grain boundary segregation for nanocrystalline stability and strength
In the last few decades, nanocrystalline metals have been of increasing interest. Their ability to show increased yield strength and uniform structure show them to be potentially useful in many applications. Additionally, nanocrystalline metals have become more easily manufactured in recent years, …
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An alloy selection and processing framework for nanocrystalline materials
Nanocrystalline materials have a unique set of properties due to their nanometer-scale grain size. To harness these properties, grain growth in these materials needs to be suppressed, particularly in order to process bulk nanocrystalline components and to use them reliably. Alloying the material …
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Molecular Dynamics Study of Microstructural Evolution in Alloys Subjected to Severe Plastic Deformation
… thought in accommodating plastic deformation in nanocrystalline alloys. A new property of the atomic mixing by plastic deformation that has been uncovered is that the effective diffusion coefficient increases, nearly linearly, with the separation distance of pairs of atoms. This superdiffusive …
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Sintering of small particles
… atomistic approach to modeling the sintering of nanocrystalline alloys has been developed. It has been shown that there exist alloys that exhibit both nanostructured stability and undergo an accelerated sintering process [1], [2]. However, the widespread adoption of such alloys has been limited …
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Thermal and thermoelectric properties of nanostructured materials and interfaces
… conductance of a variety of samples including nanocrystalline alloys of Ni-Fe and Co-P, bulk metallic glasses, and other thin films. Next, a unique thermoelectric measurement system was designed and assembled for measurements of electrical resistivity and thermopower of thermoelectric materials …
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Methods for the analysis of thermomagnetic phase transitions of magnetocaloric materials
… as Gd, Gd5Si2Ge2, La(Fe,Si)13, Ni-Mn-In Heusler alloys and Fe-, Co-, Ni-amorphous and nanocrystalline alloys. Next, various possible avenues to optimize the magnetocaloric behavior by tapping on the characteristics of rst and second order phase transition type systems were investigated. For …
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Phase Field Crystal Approach to the Solidification of Ferromagnetic Materials
… agreement with the experimental data on magnetic nanocrystalline alloys. This is a quite interesting result which enables us to comprehend the mechanism of the formation and growth of the domains in the presence of the grains and the mutual effects of the elastic and magnetic properties. Finally …
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Mechanical properties and influences of irradiation in dilute nanograined aluminum alloys
… is providing information to help develop alloys that are dimensionally stable in extreme environments. For example, nuclear reactors are exposed to high temperatures and high irradiation damage levels that can cause mechanical and microstructural instabilities such as creep, embrittlement, …
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The Spectral Model of Grain Boundary Solute Segregation
… impact the structural properties of metallic alloys, and induce effects that range from strengthening to embrittlement. And, as such, the control of solute segregation is emerging as an alloy design tool, uses of which include the stabilization of nanocrystalline alloys. To date, the standard …
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Polycrystalline Grain Boundary Solute Segregation at Finite Sizes and Temperatures
… for high-defect-density materials like nanocrystalline alloys. With this concept, solute segregation at grain boundaries can be employed as a defect design tool to stabilize such systems against coarsening. However, the understanding and availability of grain boundary data are still …
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Customisable Magnetic Components Using Nanocrystalline Flake Ribbon
… power electronics. In this thesis, a novel nanocrystalline flake ribbon (NFR) is proposed to customise high-performance magnetic components for power electronics in a cost-effective way without high-energy equipment. Conventional nanocrystalline alloys do offer much higher saturation flux …
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Phase-and-Defect Diagrams for Polycrystalline Grain Boundary Segregation
… any high-defect density material such as nanocrystalline (NC) alloys. Traditionally, bulk equilibrium phases have been considered in a decoupled manner from defects, such as solute and segregated atoms, dislocations, and grain boundaries. In recent years, a push has been made to treat …