V. I. Yakovlev

Analysis of the Influence of High Temperature Synthesis Parameters on the Structure Formation in the Mechanically Activated 3Ti+Al Powder Mixture

The influence of basic high-temperature synthesis parameters on the process of structure formation in the mechanically activated powder mixture 3Ti+Al was investigated in the study. The synthesis was realized by the method of induction heating in the thermal explosion mode. The heating temperature of the mixture reached 1500°C during the solid state reaction. This temperature exceeded the adiabatic combustion temperature. The investigations of the phase structure formation processes were conducted by XRD methods. In order to obtain a Ti3Al single-phase compound, the optimal time-temperature parameters of the synthesis were determined.

The Features of Structure Formation in Mechanically Activated Powder Mixture 3Ti+Al in the Thermal Explosion Mode

The experimental investigation of structure formation processes in preliminary mechanically activated powder mixture 3Ti + Al was carried out. The synthesis was realized in the thermal explosion mode with the use of high-frequency induction heating. The characteristic features of structure and phase formation in this system by quenching of the mixture at different annealing times were installed. It was shown, that the processes of structure-phase formation occur in the following sequence: chemical reaction - structural relaxation - thermal relaxation - thermal equilibrium. The time-temperature intervals of Ti3Al strictly single-phase compound existence with various concentrationsof non-equilibrium defects of the structure were established.

Microwave-assisted combustion synthesis in mechanically activated 3Ti + Al powder mixtures: Structure formation issues

MW-assisted combustion synthesis in mechanically activated 3Ti+Al powder mixtures in a thermal explosion mode was explored by thermography and XRD with special emphasis on the influence of mode/rate of MW heating. The main stages of the process were outlined as well as optimal conditions for preparation of single-phase Ti3Al.

The evolution of structural and phase states of titanium aluminides after γ irradiation in small doses

The structural and phase state of powder samples of compounds Ti3Al and TiAl has been investigated experimentally before and after the action of small doses of gamma irradiation. To study phase and structure parameters, the X-ray diffractometry has been used. It has been established experimentally that after the same conditions of gamma irradiation structural states of these compounds differ. It has been revealed that for compound Ti3Al small doses of gamma irradiation serve stimulators to form radiation-induced states. In the irradiated TiAl sample, a crystal-lattice distortion was observed with the retention of a high crystallinity of the structure and no signs of a special radiation-induced state were revealed.