TAILIEUCHUNG - Concise Dictionary of Materials Science Part 4

Tham khảo tài liệu 'concise dictionary of materials science part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | dispersion strengthening Strength increase caused by incoherent particles in comparison to the matrix phase. See Orowan mechanism. dispersoid See dispersed phase. This term frequently relates to inert . oxide particles in dispersion-strengthened alloys or to incoherent precipitates. dispersoid-free zone Narrow particle-free zone delineating the grain boundaries arranged perpendicular to the principal tensile stress in the sample. Such zones occur because of diffusional creep. displacement cascade Cluster of various point defects mostly vacancies and self-interstitials occurring due to irradiation damage by high-energy 1 MeV ions or thermal neutrons. The size of the clusters depends on both the mass and energy of the primary particles and on the atomic mass in the material irradiated. Cascades are characterized by a high concentration of self-interstitials at the cascade periphery and by an identical concentration of vacancies in the cascade core. displacement shift complete DSC lattice Auxiliary lattice used for description of the atomic structure of high-angle grain boundaries. Planes of DSC lattice are parallel to the CSL planes and pass through all the atomic sites in the crystal lattices of two disoriented grains. The shift of the CSL along any translation vector of the DSC lattice changes only the CSL position and does not change the CSL itself. Thus these vectors can be considered to be the Burgers vectors of perfect grain-boundary dislocations. The minimum length of the vector equals b E where b is the Burgers vector of primary dislocation and E is a CSL parameter. displacive transformation Name of shear-type transformation used in ceramic science. divacancy Complex of two vacancies in adjacent lattice sites. Divacancy has a smaller free energy in comparison to two single vacancies far removed from one another. divorced eutectoid Microconstituent that in binary systems is supposed to be two-phase see eutectoid colony but in fact is single-phase. Such a .

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