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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 31 for “"Intermetallic phases"”.
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Intermetallic phases formed during galfanizing
… with Galfan is to produce a coating which has no intermetallic phases in the coating but this condition is not always achieved. Though it is important, the nature of the intermetallic phases and the mechanisms of their formation and growth during Galfanizing are far from fully understood. The …
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Growth of intermetallic phases at low temperature
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1996.
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Plastic behaviour of quasicrystals and related intermetallic phases
… metallic glasses and structurally complex alloy phases was investigated. The concepts of plasticity for simple crystalline materials cannot be applied to these materials without substational modification. Plastic deformation experiments and subsequent microstructural investigations by means of …
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Electrochemistry of intermetallic phases of Ni-Cr-Fe alloys in aqueous environment
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1991.
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Improving heat transfer in spent nuclear fuel disposal packages using metallic void fillers
… and the molten filler can lead to the growth of intermetallic phases, which can embrittle the container. The contribution of this work is twofold. First, through a down-scaled experiment, it was shown that coating a steel container with Zn and using Zn or Zn-4wt.%Al as a filler and …
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The influences of holmium on the solidification, microstructure and mechanical properties of elektron 21 magnesium alloy
… was selected due to the ability to develop new intermetallic phases together with Mg and have a positive potential to reflect the properties of Mg alloys. As the outcome from this study, the cooling parameter of Elektron 21 with lower addition Ho content, the nucleation and growth temperature of …
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Annealing effects on platinum coating morphology
… that platinum and platinum alloys readily form intermetallics. Intermetallic compounds based on platinum group metals have almost unique properties. Many of them exhibit outstanding thermodynamic stability in aqueous and elevated temperature applications. Therefore, the platinum group metals …
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Response of chromium and chromium-aluminum coatings on zircaloy-2 to high temperature steam
… elements diffused to the substrate and formed intermetallic phases with the Zircaloy substrate. The amount of coating constituents for the diffusion to Zircaloy substrate was compared to that for the oxide formation. For Al rich coatings (42/58 CrAl and 57/43 CrAl coatings), greater amount of …
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The role of alloying elements on the microstructure and thermal stability of Refractory Metal High Entropy Superalloys
… have a ordered B2 matrix and can form Al-Zr-rich intermetallic phases, limiting room temperature ductility. This thesis aimed to develop understanding of the contributions of different elements to RSA microstructures, through the systematic study of constituent systems, which will aid the design …
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Thermodynamic properties of intermetallics
In this dissertation, intermetallic phases Fe2Al5, Fe5Al8, Al3FeSi2 have been studied using density functional theory (DFT). The theoretical methods allow for parameter-free predictions without any experimental input of thermodynamical data like specific heat or phase stabilities. Such information …
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Informing Data-Driven Recyclable Aluminum Design with Phase Constraints
… To suppress detrimental 𝛽-AlFeSi constituent phases and promote strengthening 𝑀𝑔₂𝑆𝑖 intermetallic phases, ratios of Fe/Mn=1 and Mg/Si=1.73 are sufficient. Equilibrium and Scheil calculations of commercial compositions show non-linear regimes where the Fe/Mn=1 rule may be too conservative and …
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Commissioning a Novel Quad Near Field Detector for High Energy X-Ray Diffraction Microscopy with Preliminary Applications to an Aluminum Alloy
… grains was attained. Evidence of a network of intermetallic phases can be seen in these reconstructions. A high contrast filter applied during post processing to highlight this network. The reconstructions display primary phase grain and secondary dendritic arm behaviour. Future improvements …
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ΔΟΜΗ ΚΑΙ ΔΙΑΒΡΩΤΙΚΗ ΣΥΜΠΕΡΙΦΟΡΑ ΚΡΑΜΑΤΩΝ ΑΛΟΥΜΙΝΙΟΥ-ΧΑΛΚΟΥ-ΜΑΓΓΑΝΙΟΥ ΓΡΗΓΟΡΑ ΣΤΕΡΕΟΠΟΙΗΜΕΝΩΝ
… AND X-RAY DIFFRACTION ANALYSIS. THE EQUILIBRIUM PHASES, AL6MN AND AL2CU FOUND IN THE CONVENTIONALLY SOLIDIFIED ALLOYS WERE NOT OBSERVED IN THE RAPIDLY SOLIDIFIED (AS-SPUN) ALLOY. INSTEAD THE TERNARY COMPOUND AL2OCU2MN3 AND A-AL SOLID SOLUTION WERE EXCLUSIVELY PRESENT. THE STABILITY OF THE AL-4.5 …
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Micromechanistic analysis of fatigue in aluminium silicon casting alloys
… as the matrix with silicon particles and several intermetallic phases. Previous research on Al-Si casting alloys has demonstrated that porosity is detrimental to fatigue life as cracks initiate freely at pores. However, with improved casting techniques porosity can be greatly reduced and other …
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Characterization and Mechanical Properties of Nanoscale Precipitates in Modified Al-Si-Cu Alloys Using Transmission Electron Microscopy and 3D Atom Probe Tomography.
… with crystallographic study on the iron intermetallic phases. The microstructural evolution and nucleation study on the precipitates in the low-Si 319 type aluminum alloys are also presented with sample preparation and analysis condition of TEM and 3DAP tomography.
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Dissimilar Metal Friction Stir Welding of Aluminum to Magnesium Alloys
… (Mg) by friction stir welding resulted in the intermetallic formation inside the stir zone under all conditions of welding. The presence of brittle and low toughness intermetallic phases results in low strength and ductility of the weld joint. The strength of 6063 Al and AZ31B Mg (3.25 mm) butt …
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Complex oxides of the system Cu-Ni-Fe-O: synthesis parameters, phase formation and properties
… (ii) the preparation and the oxidation of intermetallic phases and (iii) the preparation and the heat treatment in air of mixed oxide/metallic powders. The thermal decomposition of freeze-dried Cu-Ni-Fe formate has been found as a suitable method for preparing single spinel phases within …
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Development of Niobium Boron grain retainer for aluminium silicon alloys
… Based on a crystallographic database search and intermetallic phases found in Aluminium–Niobium-Boron, there exists several iso-structural phases similar to those of Al3Ti and TiB2. We have selected a phase which exhibits chemical phase stability with Si (below 900 oC) and developed a potential …
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Study of growing incongruent antiferromagnetic single crystals and characterization
… with current-induced spin-orbit torques. More intermetallic antiferromagnets share the structure types of CuMnAs and Mn2Au, or at least contain degenerated in-plane magnetic configurations, are proposed as candidates for current-induced magnetic switching. Single crystals of such materials are …
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Experimental and Computational Micromechanics of Aluminum Cerium Alloys and Selective Laser Melted 316L Stainless Steel
… of the microstructural features including phases, build pattern features, and microstructural imperfections including cracks of new materials to validate any future modeling efforts. This dissertation will discuss the experimental and computational micromechanics of extruded and cast …
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