Abstract

VENTER, A.M.. Non-destructive characterization of materials and components with neutron and X-ray diffraction methods. J. S. Afr. Inst. Min. Metall. [online]. 2015, vol.115, n.10, pp.925-930. ISSN 2411-9717.  http://dx.doi.org/10.17159/2411-9717/2015/v115n10a4.

The availability of advanced characterization techniques is integral to the development of advanced materials, not only during development phases, but in the manufactured components as well. At Necsa, two modern neutron diffractometers equipped with in-situ sample environments, as well as complementary X-ray diffraction instruments, are now available as User Facilities within the National System of Innovation in support of the South African research and industrial communities. Neutrons and X-rays, owing to their different interaction mechanisms with matter, offer complementary techniques for probing crystalline materials. Both techniques enable nondestructive investigation of phenomena such as chemical phase composition, residual stress, and texture (preferred crystallite orientation). More specifically, the superior penetration capabilities of thermal neutrons into most materials allows for the analysis of bulk or localized depth-resolved properties in a wide variety of materials and components. Materials that can be investigated include metals, alloys, composites, ceramics, and coated systems. In particular, depth-resolved analyses using neutron diffraction complements surface investigations using laboratory X-rays in many scientific and engineering topics. The diffraction techniques can add significant downstream value to the anticipated nuclear industry development activities.

Keywords : residual stress; crystallographic texture; chemical phase identification; neutron; X-ray diffraction.

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