Effect of Initial Temperature and Mechanical Activation on Synthesis in a Ti + Al System
N. A. Kochetov, B. S. Seplyarskii
Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka, 142432 Russia
Keywords: горение, тепловой взрыв, механическая активация, интерметаллиды, Ti + Al, алюминид титана, температура горения, фазовый состав продуктов, combustion, thermal explosion, mechanical activation, intermetallides, Ti + Al, titanium aluminide, combustion temperature, phase composition of products
Abstract
Synthesis is carried out in a Ti + Al mixture prepared by two methods, namely preliminary mechanical activation (MA) or preheating. Synthesis occurs in the cases of layer-by-layer combustion (SHS) and thermal explosion. The dependences of burning rates of activated Ti + Al mixtures on the MA duration are investigated. The relationships between the initial temperature and the rates and maximum combustion temperatures of initial mixtures along with the elongation of samples after combustion are determined. The phase composition of the initial mixtures after activation and of the synthesis products is described. The MA duration (12 min) at which the burning rate of the mixture is maximum is experimentally determined. For this mixture (12-min MA), the dependence of the burning rates and maximum combustion temperatures along with the elongation of samples after combustion on the initial temperature is studied. Synthesis at which the content of the main phases (TiAl and Ti3Al) in the products is maximized is established.
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