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The specific internal oxidation in rapidly solidified metals
Anžel, Ivan, inženir metalurgije in materialov ; Kneissl, Albert C. ; Rudolf, Rebeka
On the case of pure copper we present the special kind of internal oxidation phenomenon that can take place in pure metals containing a high concentrationof defects, particularly thermodynamically ...stabilized vacancy clusters. The process starts with dissolution of oxygen into the metal at the free surfaces and continues with diffusion of oxygen atoms into the volume of the metal matrix where they are trapped at numerous defects in the crystal lattice. The increasing oxygen activity at these places causes the local oxidation of the matrix and consequently precipitation of fine oxide particles. The results of experimental studies confirmed the formation of microstructure consisting of continuous three-dimensional copper matrix and homogeneous fine dispersed CuzO particles of submicron size. The volume fraction of precipitated oxides depended on the started microstructure of the Cu matrix, and on the temperature and time of the intetnal oxidation process. About 6 vol.% of oxide particles has been obtained with the proposed manufacturing technique.
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