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Showing 1 to 11 of 11 for “"Lattice misfit"”.
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Effect of systematic variation in Co:Ni ratio on elemental partitioning, lattice misfit and oxidation behaviour of γ'-strengthened (Ni,Co)75Al5Ti5Cr15 (at.%) alloys
… Co. From neutron diffraction analysis, the γ-γ' lattice misfits of alloys 0-47Co were found to be positive at all test temperatures (ambient, 400, 600, 700 and 800°C) and the magnitude of lattice misfit increased as Co content increased from 0-38 at.%. Lattice misfit values decreased with …
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The potential for superlattice precipitate reinforcement in titanium-iron alloys
… synergistic benefits of a matrix with superlattice precipitates. The titanium-iron system is selected for this purpose, particularly as both are abundant elements, which should address cost and sustainability concerns. Titanium is an ideal base element owing to its high specific strength and …
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Investigation of new synchrotron X-ray and neutron techniques for local crystallographic analysis of Ni-based single crystal superalloys
… influencing their mechanical properties is the lattice misfit between the γ and γʹ phases. Consequently, extensive research has been dedicated to optimising lattice misfit values to achieve the desired mechanical performance. Accurate determination of lattice misfit is challenging due to the …
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Analysis and modelling of the dislocation response during non-isothermal creep in Ni-SX superalloys
… the non-isothermal evolution of the interfacial lattice misfit. Furthermore, the thermal cycling creep rate under these conditions depends on the creation of interfacial dislocation networks that can take two shapes (a classical edge-type network, or one in which the dislocations are paired) and …
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Phase stability in ti/bcc multilayered thin films
… thin film architectures. The influences of lattice misfit, layer thickness, composition and chemical intermixing on the phase stability are determined. In situ thin film growth stresses of these materials are measured and correlated to the interfacial stress evolution to help rationalize the …
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Growth and characterization of epitaxial metastable (gallium arsenide)(1-x)(silicon(2))(x) alloys and (gallium arsenide)(1-x)(silicon(2))(x)/gallium arsenide strained-layer superlattices
… substrates ($\approx$30 arc-sec) and that the lattice constants, uncorrected for strain, varied linearly between values for GaAs and Si. Alloys with 0 $\leq$ x $\leq$ 0.20 were shown by cross-sectional and plan-view transmission electron microscopy to be dislocation free. Film/substrate lattice …
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Chemistry, design, and processing of two-stage TRIP steel
… formulated utilizing the Young’s modulus (E), lattice misfit squared (δ²), and molar volume (Ω) which opposed the chemical driving force for α-martensite formation. The M<sup>α</sup><sub>S</sub> was determined at a temperature at which ΔG<sup>λ→α</sup><sub>Chem</sub> + …
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Development of (Re)BaCuO Coated Conductors by Liquid Phase Epitaxy
… thickness, dislocations started to form as a lattice-misfit stress relieving mechanism that led to step formation and spiral growth around dislocation cores. The growth kinetics from an unstirred solution was found to obey a $t$ law, whereas the growth rate from a stirred solution (substrate …
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Factors contributing to the yield strength of polycrystalline nickel-based superalloys
Nickel-based superalloys are the material of choice for use in the hottest regions of gas turbine engines due to their inimitable mechanical properties, in particular, high temperature strength. As we become increasingly aware of the environmental consequences of air travel, manufacturers are …
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Lattice gas models and simulations of epitaxial growth
… (MBE). The basic idea is to use a discrete lattice gas representation of the crystal structure, and to apply kinetic Monte Carlo (KMC) simulations for the description of the growth dynamics. The main advantage of the KMC approach is the possibility to account for atomistic details and at the …
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Investigation effect of external stress on hydrogen solvus in a zircaloy-4 fuel cladding alloy: application of in situ diffraction technique and mesoscale phase-field simulation
… in low strain energy region which creates more lattice misfit strain to compensate the gradient. This explains why stress would affect hydride dissolution and precipitation differently in different Zr crystals as observed by the diffraction experiments. The modeling result also supports the …