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Experimental Studies of Ordering and Decomposition Processes in Alloys
Abstract As the local atomic arrangement in alloys is responsible for many macroscopic properties, local ordering and decomposition processes have always received particular attention in physical metallurgy (see, e.g. Cahn and Haasen, 1983). Often, starting from a supersaturated solid solution, ordering and phase separation are intimately connected as one of the decomposition products may be an ordered intermetallic phase. In Ni-rich solid solutions, ordered structures frequently form at intermediate temperatures. The initial stages of ordering and (coherent) precipitation and the shape and arrangement of inhomogeneities are of interest not only for fundamental reasons, but also for an understanding of the outstanding mechanical properties of multi-component technical “superalloys”. Four important binary systems, Ni-Al, -Ti, -Cr, and -Mo, are therefore currently studied by combining several advanced techniques, i.e. diffuse and smallangle scattering with X-rays and neutrons, weak-beam and high-resolution transmission electron microscopy as microstructural tools, with physical property measurements, e.g. of electrical resistivity and mechanical strength. The results obtained to date are briefly summarized, and first details on short-range order in a-Cu-Zn, obtained from diffuse neutron scattering, are also presented.
Experimental Studies of Ordering and Decomposition Processes in Alloys
Abstract As the local atomic arrangement in alloys is responsible for many macroscopic properties, local ordering and decomposition processes have always received particular attention in physical metallurgy (see, e.g. Cahn and Haasen, 1983). Often, starting from a supersaturated solid solution, ordering and phase separation are intimately connected as one of the decomposition products may be an ordered intermetallic phase. In Ni-rich solid solutions, ordered structures frequently form at intermediate temperatures. The initial stages of ordering and (coherent) precipitation and the shape and arrangement of inhomogeneities are of interest not only for fundamental reasons, but also for an understanding of the outstanding mechanical properties of multi-component technical “superalloys”. Four important binary systems, Ni-Al, -Ti, -Cr, and -Mo, are therefore currently studied by combining several advanced techniques, i.e. diffuse and smallangle scattering with X-rays and neutrons, weak-beam and high-resolution transmission electron microscopy as microstructural tools, with physical property measurements, e.g. of electrical resistivity and mechanical strength. The results obtained to date are briefly summarized, and first details on short-range order in a-Cu-Zn, obtained from diffuse neutron scattering, are also presented.
Experimental Studies of Ordering and Decomposition Processes in Alloys
Kostorz, Gernot (author)
1988-01-01
12 pages
Article/Chapter (Book)
Electronic Resource
English
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