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Showing 1 to 20 of 37 for “"TiAl"”.
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Plasticity of γ-TiAl alloys
… well as in high performance automobiles and potentially the nuclear industry. The lack of toughness of its two constitutive intermetallic phases, γ-TiAl and α2-Ti3Al, prevents a conventional damage tolerant approach to fatigue lifing. To gain confidence in the use of γ-TiAl alloys and extend the …
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Mechanisms of Deformation and Fracture in TiAl: An Atomistic Simulation Study
The intermetallic compound TiAl possesses a unique complex of properties that include sufficiently low material density, high values of the strength-to-ductility ratio, high elastic moduli, high oxidation resistance, low creep rate, and improved fatigue characteristics. These properties make TiAl …
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Investigation about new TiAl alloy to be processed by Electron Beam Powder Bed Fusion
L'abstract è presente nell'allegato / the abstract is in the attachment
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Defect Structures in Ordered Intermetallics; Grain Boundaries and Surfaces in FeAl, NiAl, CoAl and TiAl
… aluminides, FeAl, NiAl and CoAl and <I>L</I>1₀ γ-TiAl were investigated using molecular statics and embedded atom potentials in order to explore general trends for a series of B2 compounds as well as TiAl. The potentials used correctly predict the proper mechanism of compositional disorder of …
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Formation And Growth Mechanisms of a High Temperature Interfacial Layer Between Al and TiO2
… analytical techniques; and the formation of TiAl as the interfacial compound is described. The thermodynamics of the Al – Ti – O system is explained as it relates to the particular conditions for the Al – TiO2 reaction research. Thermodynamic principles have been used to demonstrate that the …
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The machinability of a gamma titanium aluminide intermetallic
… of the gamma titanium aluminide intermetallic (-TiAl) Ti-45Al-8Nb-0.2C currently under evaluation to be the material of choice for blades and stators in the intermediate compressor (IP) and low pressure (LP) turbine sections of an aeroengine due to the alloys high temperature (~800C) and low …
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The effect of nitrogen, niobium and temperature of the high temperature oxidation of titanium aluminide alloys
… set of three intermetallics -- unalloyed [gamma]-TiAl, unalloyed [alpha]-Ti 3Al and a nearly stoichiometric Ti2NbAl (an orthorhombic intermetallic structure) -- was chosen and investigated under a variety of experimental conditions. Gas mixtures of varying oxygen concentrations in both argon and …
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Numerical modelling of the tilt casting processes of titanium alumindes
… the tilt casting process of Titanium Aluminides (TiAl). This study is carried out in parallel with the experimental research undertaken in IRC at the University of Birmingham. They propose to use tilt casting inside a vacuum chamber and attempt to combine this tilt casting process with Induction …
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Deformation processed IMC-reinforced metal matrix composites
… of utilizing TiB₂-reinforced near-gamma TiAl intermetallic matrix composites (IMCs) as a reinforcing entity within a commercially pure Ti matrix was investigated. IMCs are "ceramic-like" at ambient to moderate temperatures, and “metallic-like" in their deformation behavior above their …
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Study of Titanium based Composite Coatings for Resistance against Molten Aluminium Soldering on H13 Tool Steel
… steel substrates to produce Ti(Al,O)/Al₂O₃ and TiAl/Al₂O₃ composite coatings. The performance of the coatings was assessed in terms of Al soldering, liquid metal corrosion resistance, thermal shock resistance and wear resistance. In an immersion test, the coated specimens were dipped into molten …
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Cardiac MRI Data Segmentation Using the Partial Differential Equation of Allen–Cahn Type
… solution of the geometrical evolution partial differen- tial equation of the Allen-Cahn type. This equation has origin in the description of motion by mean curvature and has diffusive character. The diffusion pro- cess can be controlled by the segmented signal so that the edges of the …
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Numerical Synthesis of Arbitrary Multi-Qubit Unitaries with low 𝑇-Count
… corrected quantum circuits by using sequen- tial two-pass multistart numerical optimizaton to reduce the number of 𝑅z gates that must be approximated with Clifford+𝑇 circuits. This technique allows NISQ synthesis based on numerical optimization to be applied to fault-tolerant circuits as well.
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The erosion of titanium aluminide intermetallic alloys
… strain in phase boundary regions and the preferential removal of the more brittle component of the microstructure. For the Ti₃Al-based alloy, cavitation erosion resistance increases with an increase in hardness produced by heat treatment. The TiAl-based alloys exhibit twinning during the initial …
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Evaluation of tests for porosity and defects in PVD and electroless coatings.
The porosity of electroless nickel, (TiAl)N, TiN and CrN PVD coatings on mild steel having different surface roughnesses was investigated using porosity/corrosion tests. The tests used were the neutral salt spray test, ferroxyl test, sulphur dioxide test and the copper cementation test. …
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Temporal decomposition and semantic enrichment of mobility flows
… increasingly important as GIS is now an essen- tial decision support platform in many domains that use mobility data, such as eet management, accessibility analysis and urban transportation planning. This thesis applies the machine learning method of probabilistic topic mod- elling to decompose …
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The high energy asymptotic distribution of the eigenvalues of the scattering matrix
… a smooth short-range real-valued electric potential and<br/>A = (A1, . . . , Ad) : Rd → Rd is a smooth short-range magnetic vector-potential. Two cases are considered. The first case is where the magnetic vector-potential is non-zero. The spectral density of the associated scattering matrix in …
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The prediction of bubble defects in castings
… and transport of gas bubbles in solidifying TiAl castings. The candidate has reviewed the literature, programmed in FORTRAN code, and validated a number of competing techniques for two phase flow relevant to the filling of moulds. He has developed a hybrid (Donor-acceptor/ Level Set) method, …
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Charakterisierung verschleißmindernder Hartstoff-Viellagenschichten und Optimierung ihrer mechanischen Eigenschaften durch Untersuchung der Nanostruktur
… aber auch Schichtsysteme der Komponenten AlON, (TiAl)N, und (Ti,Al)ON. Darüber hinaus wurden noch TiC-aC (TiC mit amorphem Kohlenstoffanteil)-Schichten einbezogen. Ziel waren gleichmäßige Multischichten mit Korngrößen von einigen Nanometern, geringer Testur und geringer Mikrorissdichte, die hart …
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Optimizing COVID-19 control measures using multi-objective deep reinforcement learning
… binomial (Stochastic) and Ordinary Differen- tial Equation mathematical models. The study highlights the potential of multi-objective deep reinforcement learning as a method of optimizing public health interventions by shedding light on the optimum COVID-19 control methods for various …
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Electron tomography of defects
… array of rods, not a at plane. Dislocations in a TiAl alloy were reconstructed from WBDF images with no thickness contours, giving an exceptionally clear reconstruction. The e ect of misalignment of the tilt axis with systematic row g(ng) was assessed by simulating tilt series with di raction …
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