Kinetics of intermetallic phase formation in the Ti/Al multilayers

Production of intermetallic compounds from Ti/Al and Ni/Al multilayer thin films—A comparative study

“…For periods between 30 and 200 nm trialuminide phases such as TiAl 3 , NiAl 3 and Ni 2 Al 3 occur at intermediate temperatures. Therefore, the structural evolution sequence strongly depends on the multilayer period, corroborating the kinetic study of Illeková et al [13]. Variations on the reaction temperatures occur as they depend on the multilayer films' processing and heat treatment conditions.…”

“…The grain growth depends on the heat treatment temperature, isothermal period and heating rate. The resultant grain size distribution should correlate with the JMA nucleation-and-growth kinetics deduced by Illeková et al [13]. After heat treatment even by SEM it is possible to distinguish the grains as illustrated in Fig.…”

“…The influence of the modulation period has been definitely proven in a recently published detailed kinetic study [13]. The Johnson-Mehl-Avrami (JMA) nucleation-and-growth kinetics of Ti/Al multilayers depend on the individual layer thickness and different kinetic regimes have been found for thick, thin and very thin layers [13].…”

“…Furthermore, phase formation sequence in these multilayers depends on their average chemical composition, modulation period and processing history [7,[8][9][10][11][12]. The influence of the modulation period has been definitely proven in a recently published detailed kinetic study [13]. The Johnson-Mehl-Avrami (JMA) nucleation-and-growth kinetics of Ti/Al multilayers depend on the individual layer thickness and different kinetic regimes have been found for thick, thin and very thin layers [13].…”

Synchrotron in situ studies of mechanical activation treatment and γ-radiation impact on structural-phase transitions and high-temperature synthesis parameters during the formation of γ-(TiAl) compound

“…These alloys can seriously compete with nickel-based superalloys, since titanium aluminides are lighter, have high corrosion resistance, resistance to high-temperature oxidation, high modulus of elasticity and strength, and do not require expensive and scarce elements for alloying. Obtaining singlephase compositions of titanium aluminides of various stoichiometry, including the method of high-temperature synth-ISSN 1600-5775 # 2019 International Union of Crystallography esis (SHS), has been the subject of many research works (Lagos et al, 2010;Nová k et al, 2009;Illeková et al, 2008). However, the traditional SHS method allows only a strictly single-phase TiAl 3 compound to be obtained (Wang & Zhang, 2006).…”