Effect of mechanical activation and the content of a mechanical binder on $\mathrm{Ti}+2\mathrm{B}+x(\mathrm{Fe}+\mathrm{Co}+\mathrm{Cr}+\mathrm{Ni}+\mathrm{Al})$ combustion

This paper describes a study of the effect of a $\mathrm{Fe}+\mathrm{Co}+\mathrm{Cr}+\mathrm{Ni}+\mathrm{Al}$ 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 $\mathrm{Ti}+2\mathrm{B}+x(\mathrm{Fe}+\mathrm{Co}+\mathrm{Cr}+\mathrm{Ni}+\mathrm{Al})$ 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 $\mathrm{Fe}+\mathrm{Co}+\mathrm{Cr}+\mathrm{Ni}+\mathrm{Al}$ binder to the activated $\mathrm{Ti}+2\mathrm{B}$ mixture prevents mechanochemical synthesis from proceeding during 5-min long MA.