Institute of Physics of Materials AS CR, v. v. i. > Projects > Optimization of structure and properties of advanced high-temperature cast materials alloyed with carbon by complex heat treatment

Optimization of structure and properties of advanced high-temperature cast materials alloyed with carbon by complex heat treatment

Investigatorprof. Mgr. Tomáš Kruml, CSc.
Number of ProjectP107/11/0704
AgencyGrantová agentura České republiky
Duration2010-12-31 - 2014-12-30

The aim of the project is development of new advanced cast multiphase gamma based TiAl-8Nb-X alloys alloyed with the graded carbon content (0.2 to 1 at.%), produced so far only by powder metallurgy. Sufficient thermo-mechanical stability of these alloys will be guaranteed by the lamellar structure strengthened by favorable distributed precipitates obtained using an optimized complex heat treatment. The main pertinent applications of the alloys suggested are turbocharger rotor or gas turbine blade in automotive and power industry, respectively, in which a decisive degradation mechanism represents creep-fatigue interaction at higher temperatures. The structure of new-developed cast alloys and its thermo-mechanical stability will be studied both in virgin state after optimized heat treatment and after high temperature creep-fatigue tests. Neutron diffraction (in-situ and post-mortem studies), TEM (transmission electron microscopy) and other modern experimental techniques will be used for the structure analysis and the study of damage mechanisms.


Chlupová A., Heczko M., Obrtlík K., Beran P., Kruml T.: Effect of Alloying and Thermal Processing on Mechanical Properties of TiAl Alloys. Solid State Phenom. 258 (2017) 501-505


Chlupová A., Heczko M., Obrtlík K., Polák J., Roupcová P., Beran P., Kruml T.: Mechanical properties of high niobium TiAl alloys doped with Mo and C. Mater. & Design 99 (2016) 284-292

Beran P., Heczko M., Kruml T., Panzner T., Petegem S.: Complex investigation of deformation twinning in gama-TiAl byTEM and neutron diffraction. J. Mech. Phys. Solids 95 (2016) 647-662


Kruml T., Chlupová A., Obrtlík K.: Cyclic deformation of a modern TiAl alloy at high temperatures. Adv. Mater. Res. 891-892 (2014) 1131-1136

Beran P., Petrenec M., Heczko M., Smetana B., Žaludová M., Šmíd M., Kruml T., Keller L.: In-situ neutron diffraction study of thermal phase stability in a gamma-TiAl based alloy doped with Mo and/or C. Intermetallics 54 (2014) 28-38

Kruml T., Obrtlík K.: Microstructure degradation in high temperature fatigue of TiAl alloy. Int. J. Fatigue 65 (2014) 28-32

Chlupová A., Obrtlík K., Beran P., Heczko M., Polák J., Kruml T.: Monotonic and cyclic properties of TiAl alloys doped with Nb, Mo and C. Procedia Eng. 74 (2014) 405-408

Petrenec M., Vraspírová E., Němec K., Heczko M.: Effect of cyclic heat treatment on cast structure of TiAl alloy. Key Eng. Mater. 586 (2014) 222-225


Polák J., Obrtlík K., Petrenec M., Man J., Kruml T.: Mechanisms of high temperature damage in elastoplastic cyclic loading of nickel superalloys and TiAl intermetallics. Procedia Eng. 55 (2013) 114-122