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Showing 1 to 13 of 13 for “"Grain boundary energy"”.
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Molecular Dynamics Studies of Anisotropy in Grain Boundary Energy and Mobility in UO₂
Nuclear energy is a proven large-scale, emission-free, around-the-clock energy source. As part of improving the nuclear energy efficiency and safety, a significant amount of effort is being expended to understand how the microstructural evolution of nuclear fuels affects the overall fuel …
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ABNORMAL GRAIN GROWTH IN MAGNETOSTRICTIVE GALFENOL ROLLED SHEET
… enhance the rollability of and abnormal grain growth (AGG) in polycrystalline Galfenol rolled sheet. Driving forces, due to grain boundary energy, surface energy, deformation energy and magnetic fields are generally considered to explain grain growth phenomena. In this dissertation, the …
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A phase field model for the gallium permeation of aluminum grain boundaries
Interfaces, such as grain boundaries, solid-liquid interfaces and solid-solid heterophase interfaces, are important features found in materials. Material properties such as fracture toughness, corrosion susceptibility and high temperature creep are influenced by grain boundary physics. The …
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Synthesis, Consolidation, and Mechanical Testing of Nanophase Metals
… for both specimens are lower than activation energy for grain boundary diffusion in microcrystalline materials. A model is proposed to explain the higher creep rate. It assumes that the specimens produced from vapor condensed powders have a higher grain boundary energy due to a higher disorder …
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Computer simulation study of grain boundary structure in B2 NiAl
In an effort to understand intrinsic grain boundary brittleness, computer simulation of grain boundary structures in ordered NiAl was carried out. The considered boundaries were boundaries of low reciprocal coincident site density Σ. The structural unit model was used to obtain a general picture of …
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Atomistic computer simulation analysis of nanocrystalline nickel-tungsten alloys
… atomic conditions of physical systems with 2-4nm grain diameters. Here, a new model subjects a vertically thin unique volume containing 3nm or 10nm FCC grains with aligned z axes to a Monte Carlo-type minimization to investigate the segregation and ordering behavior of W atoms. Short-range order …
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Design of a stable nanocrystalline alloy
… unstable due to their high material fraction of grain boundaries, preventing their improved properties from being used in application. To stabilize the nanoscale grain size against rampant growth, past literature has proposed lowering the grain boundary energy through solute segregation to the …
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Tensile Stress and Thermal Growth Effects on Grain Boundary Motion in Nanocrystalline Nickel
… involve molecular dynamics (MD) simulations of grain boundary motion in nanocrystalline (nc) nickel. The first study is conducted to examine the effects of an applied tensile stress on the grain boundary motion in 5 nm3 nc-Ni specimens, half of which contain free surfaces, while the other half …
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Microscale mechanical characterization of materials for extreme environments
… relationship between their microstructure and grain boundary deformation behavior. Previous molecular dynamics simulations suggested that solute additions to grain boundaries can enhance the strength of nanocrystalline metals, but there has been a lack of experimental studies investigating this …
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Towards data-driven inverse design for materials and structures
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms
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Διεπιφανειακές ιδιότητες συστημάτων κεραμικών οξειδίων (δομικών και λειτουργικών) σε επαφή με ρευστές φάσεις
Τα προηγμένα (δομικά ή λειτουργικά) κεραμικά θεωρούνται ως τα πλέον κατάλληλα υλικά για εφαρμογές όπου απαιτούνται υψηλές θερμοκρασίες. Διαθέτουν μία σειρά από πλεονεκτήματα όπως π.χ. αντοχή σε θερμικούς αιφνιδιασμούς, υψηλή σκληρότητα, αντοχή σε φθορά και διάβρωση και μεγάλο εύρος στις τιμές των …
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Synthesis-Structure-Property Relationships in Lead-Free Piezoelectric Materials
… of devices such as sensors, actuators and energy harvesters. However, most of these piezoelectric materials utilize lead-based systems which are becoming serious problem owing to the restrictions imposed by regulatory agencies across the globe. In the functional ceramics community, …
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ΜΕΛΕΤΗ ΤΩΝ ΕΠΙΦΑΝΕΙΑΚΩΝ ΚΑΙ ΔΙΕΠΙΦΑΝΕΙΑΚΩΝ ΙΔΙΟΤΗΤΩΝ ΤΗΣ ΣΤΑΘΕΡΟΠΟΙΗΜΕΝΗΣ ΖΙΡΚΟΝΙΑΣ ΚΑΙ ΣΥΣΤΗΜΑΤΩΝ ΖΙΡΚΟΝΙΑΣ ΣΕ ΕΠΑΦΗ ΜΕ ΡΕΥΣΤΑ ΜΕΤΑΛΛΑ
… MEASUREMENT OF CONTACT ANGLES, THE SURFACE AND GRAIN-BOUNDARY ENERGIES OF POLYCRYSTALLINE CUBIC ZRO2 IN THE TEMPERATURE RANGE OF 1173 TO 152 B.K. WERE DETERMINED. THE TEMPERATURE COEFFICIENTS OF THE LINEAR TEMPERATURE FUNCTION OBTAINED, ARE EXPRESSED AS DΓSV/DT=-0431X10- 3 Z.M-2 K-1 AND …