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Showing 1 to 20 of 63 for “"intermetallics"”.
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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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The thermal conductivity of intermetallics
The thermal conductivity of titanium aluminide and several ruthenium-aluminium alloys has been studied from room temperature up to 500°C. Ruthenium aluminide is a B2-type intermetallic which is unusual and of special interest because of its toughness, specific strength and stiffness, oxidation …
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Substitution and Disorder Effects in Ternary Intermetallics
… of substitution and disorder effects in ternary intermetallics. The crystal growth, crystal structure, and physical properties are reported on single crystals of Ln6W4-xAl43-yTx+y (Ln = Gd, Yb; T= Mn, Fe), LnCr2FexAl20-x (Ln = Yb, Gd), Sm1.33Pd3Ga8, and CeCo2-xMxAl8 (M = Mn, Fe, Ni; 0 ≤ x < 1). …
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Processing of aluminum-nickel intermetallics by reactive infiltration
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1997.
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Thermal expansion behavior of Mo-Si-B system intermetallics
… at temperatures above 1000 0C. Mo-Si-B system intermetallics have been attracting attention as promising candidate materials for such applications, especially materials containing Mo5Si3 (T1) phase. However, Mo5Si3 single crystal has significant thermal expansion anisotropy along the a and c …
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In-plane magneto-crystalline anisotropy of magnetic kagome intermetallics
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
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Lightweight Intermetallics with Laves Structures as Potential Hydrogen Storage Materials
<p>Hydrogen storage was identified by the US Department of Energy as a “grand challenge” for the implementation of hydrogen-powered fuel cell vehicles for reduced CO2 emissions from transportation vehicles. None of the hydrogen storage options currently developed can satisfy the high gravimetric, …
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Alloying effects on high-temperature deformation behavior of nickel aluminide intermetallics
The objective of this research is to examine the possibility of using nickel aluminide for high temperature structural applications. NiAl is a desirable candidate based on its low density, high thermal conductivity, high melting temperature, and its proven oxidation resistance. Currently, limited …
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Identification and Characterization of the Iron-Zinc Intermetallics Formed in Galvanneal steel
… and hyperfine parameters of the iron-zinc intermetallics along with the new detector were used to study several commercially produced galvanneal coatings. The detailed analysis of the coatings has enabled the positive identification of the phases as layers within the coatings. Phase …
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Phase Stability In Cobalt-Based L12 Quaternary Intermetallics From Density Functional Theory
… Hf, Fe, V) on the phase stability of L12 (γ’) intermetallics have been studied via first-principles. A 32 atom special-quasi-random structure was used to mimic the experimentally observed solid solution sublattice. Density of states distributions were generated in order to directly observe the …
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Computation and application of the lattice Green function to dislocations in metals, intermetallics, and semiconductors
… screw, edge, and mixed dislocations in metals, intermetallics, and semiconductors, and use them within the FBC approach coupled with DFT to accurately determine the equilibrium dislocation core structures. First, we compute the core structures of five different dislocations in BCC iron -- …
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Defect Structures in Ordered Intermetallics; Grain Boundaries and Surfaces in FeAl, NiAl, CoAl and TiAl
Ordered intermetallics based on transition metal aluminides have been proposed as structural materials for advanced aerospace applications. The development of these materials, which have the advantages of low density and high operating temperatures, have been focused on the aluminides of titanium, …
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The effect of alloying element in lead-free solders on intermetallics growth with enimag surface finish
Surface finish is coated layer plated on a bare copper board of printed circuit board (PCB). Among PCB surface finishes, Electroless Nickel/Immersion Gold (ENIG) finish is a top choice among electronic packaging manufacturer due to its excellent properties for PCB. However, the use of gold element …
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[57]Fe Mossbauer spectroscopy and complementary analysis of tin coated steel.
… potassium iodate / sodium hydroxide solution any intermetallics from the uppermost surface layer of the samples and can be identified. Commercially produced DWI tinplate shows some signs of FeSn2 on the ironed walls where temperatures reach 200°C, and no intermetallics on the base where …
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Influence of ultrasonic cavitation treatment on fragmentation and de-agglomeration of primary intermetallics and oxides formed in Al alloys
… fragmentation and de-agglomeration process of intermetallics and oxides. Over the years, water has been recognised as a suitable analogue to mimic molten aluminium showing similar acoustic cavitation behaviour under ultrasonic excitation. This dissertation presents a novel approach that aims to …
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Strongly correlated electron behavior in transition metal intermetallics: enhanced thermoelectricity and quantum criticality in FeGa₃ and superconductivity in NiBi₃
<p>TGa3 (T = Fe, Ru & Os) and RuIn3 are a class of isostructural intermetallic binary compounds with interesting physical and structural properties. These materials are non-magnetic, narrow band gap semiconductors with large n-type thermopower below room temperature. Chemical doping drastically …
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On the synthesis, characterization, and magnetization of Ln-M-X (Ln = lanthanide; M = Ti-Cr, Cu, Mo, Pd; X = Al, Ga) intermetallics
The focus of the research presented herein was to grow single crystals of Ln-M-X (Ln = lanthanide; M = Ti-Cr, Cu, Mo, Pd; X = Al, Ga) intermetallic compounds and to characterize their crystal structures and physical properties. Overall, the flux growth technique facilitated a detailed analysis of …
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Influence of alloying and processing on the degradation properties of Mg-Dy-Zn alloys under physiological conditions
… of Mg-based biomaterials. However, the intermetallics can precipitate during these procedures and subsequently introduce the galvanic corrosion, which may accelerate the degradation of Mg alloys. To investigate the types, amounts and distributions of intermetallics and their effects on …
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Atomistic simulation of defect structure in Nb-Ti-Al
… An estimation of the ductility of these intermetallics was made using both the Rice and ZCT ductility criteria. Comparison of the criteria with values for other B2 intermetallics leads to the conclusion that the simulated Nb-Ti-Al B2 compounds are ductile.
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