In situ phase formation during high-temperature synthesis in clad mechano­composites based on the Ti–Al system

An in situ synchrotron experimental study of phase formation dynamics in clad mechano­composites of Ti–Al systems during high-temperature synthesis was performed. Cladding of the obtained mechano­composites was carried out with an SiO(2) target, with a deposition time of 40 min. The high-temperature synthesis was performed using the thermal explosion method based on a microwave induction heater in the in situ mode on an experimental setup adapted to synchrotron radiation time-resolved diffractometry. The influence of the cladding on the macrokinetic parameters of synthesis in situ was investigated experimentally. It was found that for an ignition temperature T (ig) = 650 ± 10°C, the maximum synthesis temperatures were in the range T (max) = 1380–1465°C. The characteristic heating speed was 525 K min(−1). The sequence and temperature–time interval of phase formation are determined. The formation of the TiAl, TiAl(3) and Ti(3)Al compounds begins at T = 661°C. At T (max) = 1465.6°C, the synthesis product is multiphase, the structures of the formed TiAl(3) (content about 70%) and TiAl (content about 25%) have a nonequilibrium state. At the stage of system annealing with T = 1384.9°C, the reaction of the components occurs with the formation of almost monophase TiAl (content of more than 90%); Ti occupies the rest.