National University of Science and Technology “MISiS” (Moscow, Russia):

Yu. B. Sazonov, Cand. Eng., Associate Prof., Dept. of Metallurgy and Strength Physics, E-mail: u-sazonov@yandex.ru
D. Yu. Ozherelkov, Cand. Eng., Associate Prof., Dept. of Metallurgy and Strength Physics;

Institute of Criminology of the Center for Special Equipment of the Federal Security Service of Russia (Moscow, Russia):
R. Sh. Latypov, Employee of the Institute
E. E Gorshkov, Cand. Biol., Employee of the Institute

Possibility of determination of the fragments and articles made of different grades of steel aluminium and copper alloys and their affiliation to the common melt was examined via the methods of photoelectric spectral analysis based on composition of micro-impurities. Chemical elements with micro-impurities were revealed; they allow to determine affiliation of metal fragments to one melt. Ultimately possible deviations of micro-impurities within one melt were obtained. The technique allowing to establish affiliation of fragments to the common melt based on their elementary composition of micro-impurities with minimal amount of measurements was suggested based on the obtained results. The minimal geometric size of a sample available for analysis was determined; it allows to classify the examined fragments to one melt based on the results of investigation of expanded elementary composition of micro-impurities. Practical opportunities of this technique were displayed on the example of the alloys with different chemical composition.

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