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- W2018503678 abstract "The concept of a non-destructive test is defined. One of the criteria - that the purpose of examination be to relate past history of a particular specimen (or group of specimens) with expected future service performance - is not fulfilled by much conventional X-ray diffraction work. Nevertheless, five groups of X-ray diffraction tests are useful in non-destructive examinations: (i) X-ray fluorescent spectrometry in chemical element analysis; (ii) X-ray diffractometric phase analysis; (iii) X-ray measurements of orientation textures; (iv) precision X-ray determinations of lattice parameters which depend on solid-solution, temperature and strain effects: (v) X-ray determinations of line profiles related to crystal size and perfection. Conventional X-ray diffraction tests suffer from (a) insensitivity to localized, but physically significant lattice defects, and (b) restrictions due to the smallness of surface volumes examined. The latter short-coming is overcome by high-voltage diffraction testing which, however, is limited to coarsely-grained materials. For these it provides a non-destructive grain-size test. Polychromatic streaks (asterism) on high-voltage diffraction pictures are interpreted in terms of small changes of lattice orientation within grains due to strains or polyganization. Absence of streaks implies a high degree of grain perfection which is lost under diverse types of service conditions such as those causing fatigue in metals." @default.
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- W2018503678 title "The potentialities of X-ray diffraction studies in non-destructive testing" @default.
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