Effect of Manganese Content and Mechanical Activation on Ni + Al + Mn Combustion

This paper describes a study of the influence of mechanical activation (MA) and Mn content on burning rate, maximum combustion temperature, sample elongation during combustion, size of composite particles, mixture yield after MA, phase composition, and morphology of synthesis products in a Ni + Al + Mn mixture. The mechanical activation of the Ni + Al + Mn mixture expands the manganese content limit at which the combustion of samples without preheating is possible, from 14 to 49% (by weight). Preliminary MA makes it possible to synthesize a compound containing all three initial metals: the (Ni, Mn)Al phase being an ordered solid solution of variable composition based on NiAl. Moreover, mechanical activation causes an increase in the burning rate, elongation, and porosity of samples of products, as well as a decrease in the maximum combustion temperature. An increase in the fraction of manganese in Ni + Al + Mn causes a decrease in the size of composite particles, the elongation of product samples, and the maximum combustion temperature, as well as an increase in the mixture yield after MA. The dependence of the burning rate on the fraction of manganese in the activated Ni + Al + Mn mixture has a maximum.