Effect of Mechanical Activation and the Content of a Mechanical Binder on Ti+2B+x(Fe+Co+Cr+Ni+Al) Combustion
N. A. Kochetov
Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka, 142432 Russia
Keywords: combustion, mechanical activation, SHS, multicomponent high-entropy alloy, cermet, TiB
Abstract
This paper describes a study of the effect of a Fe + Co + Cr + Ni + Al metal binder content and mechanical activation (MA) on burning rate, maximum combustion temperature, the elongation of samples during combustion, the mixture yield after MA, the size of composite particles after MA, and the morphology and phase composition of combustion products in a Ti + 2B + x (Fe + Co + Cr + Ni + Al) system. Self-propagating high-temperature synthesis (SHS) is used to obtain a composite material consisting of ceramics and a high-entropy alloy. The MA increases from 60 to 80 % the maximum content of a metal binder in the mixture, at which SHS is carried out at room temperature. The addition of a Fe + Co + Cr + Ni + Al binder to the activated Ti + 2B mixture prevents mechanochemical synthesis from proceeding during 5-min long MA.
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