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Calorimetry of amorphous alloy crystallization processes based on quasi-binary system TiNi-TiCu
Russian version
Spivak L. V. 1, Shchepina N. E. 2, Grebenkov S. K. 1
1Perm Research Polytechnic University, Perm, Russia
2Perm State University, Perm, Russia
Email: lspivak2@mail.ru, neshchepina@mail.ru, drive@rtural.ru
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The effect of the degree of polynomial smoothing of experimental data from differential scanning calorimetry of amorphous metal alloys Ti50Ni25Cu25, Ti30.2Ni49.8Hf20, Ti40.5Ni49.8Zr9.7, Ti50.2Ni24.8Cu24.4Al0.6, Ti50.2Ni24.8Cu24.4Fe0.6 at the defined values of exothermic effects in crystallization was studied. It was shown that the values of thermodynamic parameters obtained from this data practically do not depend on the degree of polynomial smoothing. However, such procedure does impact, and quite substantially, the kinetic characteristics of the crystallization process of amorphous metal-metal alloys when they are heated. Enthalpy of the crystallization process of such alloys turned out to be by an order less that in regular crystallization of the alloys of the same composition. The start of crystallization of these alloys may formally be described by peaking-type functions, which characterizes the initial process of crystallization as spontaneous and fast. Introduction of hard-melting components in the composition, such as Hf and Zr, somewhat suppress this trend. It is essential that upon crystallization of amorphous alloys based on the quasi-binary system TiNi-TiCu the temperatures of maximum rate of crystallization center origination and maximum rate of their growth practically coincide with each other, which is not observed during normal crystallization from alloys. Keywords: amorphous state, enthalpy, entropy, peaking-type functions.
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