Institute of Physics of Materials AS CR, v. v. i. > Projects > Deformation mechanisms of in-situ composite materials

Deformation mechanisms of in-situ composite materials

Investigatorprof. RNDr. Antonín Dlouhý, CSc.
Number of Project202/09/2073
AgencyGrantová agentura České republiky
Duration2008-12-31 - 2011-12-30

We would like to take advantage of highly regular and stable microstructure of advanced in-situ composites and use them as model systems to investigate basic (high temperature) deformation mechanisms in two phase solids. Attention will be given mainly to (i) a size effect the (sub)micron sized reinforcement may have on the overall strength of the composite, (ii) the dislocation level understanding of stress redistribution (transfer) from the ductile matrix towards stiffer fibres, (iii) the role of interface phenomena (sliding, dislocation transfer and diffusion controlled recovery) on the composite strength and (iv) the mechanisms of fibre fragmentation due to high temperature exposures. Were the project granted, we may expect the following results: (i) new experimental data on the strength of in-situ composites tested in the CP, CN and TP mode, (ii) new experimental data relating the size and distribution of reinforcement and the high temperature composite strength and (iii) new TEM evidence on the (dislocation) mechanisms of stress redistribution between composite constituents.


Záležák T., Šiška F., Stratil L., Luptáková N., Šmíd M., Bártková D., Svoboda J., Dlouhý A.: A Numerical Analysis of Deformation Processes in Oxide Dispersion-Strengthened Materials - Influence of Dislocation-Particle Interactions. Solid State Phenom. 258 (2017) 106-109

Záležák T., Svoboda J., Dlouhý A.: High temperature dislocation processes in precipitation hardened crystals investigated by a 3D discrete dislocation dynamics. Int. J. Plast. 97 (2017) 1-23


Záležák T., Dlouhý A.: 3D Discrete Dislocation Dynamics Applied to Interactions between Dislocation Walls and Particles. Acta Phys. Pol. A 122 (2012) 450-452


Dudová M., Kuchařová K., Barták T., Bei H., George E., Somsen C., Dlouhý A.: Creep in Directionally Solidified NiAl-Mo Eutectics. Scr. Mater. 65 (2011) 699-702