Institute of Physics of Materials AS CR, v. v. i. > Projects > Preparation and Optimization of Creep Resistant Submicron-Structured Composite with Fe-Al Matrix and Al2O3 Particles

Preparation and Optimization of Creep Resistant Submicron-Structured Composite with Fe-Al Matrix and Al2O3 Particles

InvestigatorRNDr. Jiří Svoboda, CSc., DSc.
Number of Project14-24252S
AgencyGrantová agentura České republiky
Duration2013-12-31 - 2016-12-30

Anotace
Research on compacting mechanically alloyed powders in the applicants’ home institutions has lead to a new type of submicron-structured composite consisting of Fe-Al solid solution matrix and Al2O3 strengthening particles. Preliminary experiments indicate that the composite exhibits excellent creep- and oxidation-resistance. Compared to nickel based superalloy single crystals, the composite promises a much better performance/cost ratio in many applications. During the solution of the project the following results are expected. 1. development of a processing method leading to a uniform distribution of oxide particles of proper size and volume fraction in the matrix, 2. experimentally verified thermomechanical treatment leading to grain growth resulting in the best creep resistance, 3. detailed description of properties of the composite during high-temperature forming. A new optimized creep- and oxidation-resistant low-cost composite for long-term loading at very high temperatures and characterization of its basic properties are expected as the key results of the project.


2016

Fischer F., Svoboda J., Antretter T., Kozeschnik E.: Stress relaxation by power-law creep during growth of a misfitting precipitate. Int. J. Solids Struct. 96 (2016) 74-80

Riedl H., Svoboda J.: A model for strain hardening, recovery, recrystallization and grain growth with applications to forming processes of nickel base alloys. Mater. Sci. Eng. A 665 (2016) 175-183

Svoboda J., Shan Y., Kozeschnik E., Fischer F.: A thermokinetic model for Mg-Si couple formation in Al-Mg-Si alloys. Model. Simul. Mater. Sci. Eng. 24 (2016) 1-16

Mašek B., Khalaj O., Nový Z., Kubina T., Jirková H., Svoboda J., Štádler C.: Behaviour of new ODS alloys under single and multiple deformation. Mater. Technol. 50 (2016) 891-898



2015

Fischer F., Svoboda J.: Stress, deformation and diffusion interactions in solids - A simulation study. J. Mech. Phys. Solids 78 (2015) 427-442

Svoboda J., Shan Y., Fischer F.: A new self-consistent model for thermodynamics of binary solutions. Scr. Mater. 108 (2015) 27-30

Khalaj O., Mašek B., Jirková H., Ronešová A., Svoboda J.: Investigation on new creep-and oxidation-resistant materials. Mater. Sci. Technol. 49 (2015) 645-651

Fischer F., Svoboda J., Antretter T., Kozeschnik E.: Relaxation of a precipitate misfit stress state by creep in the matrix. Int. J. Plast. 64 (2015) 164-176

Ženíšek J., Kozeschnik E., Svoboda J., Fischer F.: Modelling the role of compositional fluctuations in nucleation kinetics. Acta Mater. 91 (2015) 365-376



2014

Svoboda J., Fischer F.: Generalization of the Lifshitz-Slyozov-Wagner coarsening theory to non-dilute multi-component systems. Acta Mater. 79 (2014) 304-314

Svoboda J., Stopka J., Fischer F.: Two-dimensional simulation of reactive diffusion in binary systems. Comp. Mater. Sci. 95 (2014) 309-315

Svoboda J., Shan Y., Kozeschnik E., Fischer F.: Determination of depths of multiple traps for interstitials and their influence on diffusion kinetics. Model. Simul. Mater. Sci. Eng. 22 (2014) 065015