Institute of Physics of Materials AS CR, v. v. i. > Projects > Phase Stability and Plasticity in Medium-to-High-Entropy Alloys

Phase Stability and Plasticity in Medium-to-High-Entropy Alloys

Investigatorprof. RNDr. Antonín Dlouhý, CSc.
Number of Project14-22834S
AgencyGrantová agentura České republiky
Duration2013-12-31 - 2016-12-30

Anotace
Research focuses on a new class of quaternary and quinary single-phase CoCrFeMnNi solid solutions that exhibit medium-tohigh configurational entropy. Their successful processing results from a technological progress achieved in last few years, therefore, very little is known concerning, e.g., their phase stability and microstructural development during high temperature loadings. The research addresses two open questions: (i) how does the high temperature stability and strength of these systems depend on the alloy processing parameters and (ii) how does the transition from the quinary system to the quaternary sub-systems influence the mechanical properties. We expect the following main results: (i) first ever published data on the relation between creep mechanisms in the quinary single-phase CoCrFeMnNi alloy and its microstructural state and (ii) a microstructurally based scenario accounting for the unusually strong temperature dependence of flow stress based on the system complexity (on the configuration entropy).

2022

Moravčík I., Zelený M., Dlouhý A., Hadraba H., Moravčíková-Goueva L., Papež P., Fikar O., Dlouhý I., Raabe D., Li Z.: Impact of interstitial elements on the stacking fault energy of an equiatomic CoCrNi medium entropy alloy: theory and experiments. Sci. Technol. Adv. Mater. 23 (2022) 376-392


2021

Heczko M., Mazánová V., Gröger R., Záležák T., Hooshmand M., George E., Mills M., Dlouhý A.: Elemental segregation to lattice defects in the CrMnFeCoNi high-entropy alloy during high temperature exposures. Acta Mater. 208 (2021) 116719


2020

Schneider M., George E., Manescau T., Záležák T., Hunfeld J., Dlouhý A., Eggeler G., Laplanche G.: Analysis of strengthening due to grain boundaries and annealing twin boundaries in the CrCoNi medium-entropy alloy. Int. J. Plast. 124 (2020) 155-169


2019

Schneider M., George E., Manescau T., Záležák T., Hunfeld J., Dlouhý A., Eggeler G., Laplanche G.: Benchmark dataset of the effect of grain size on strength in the single-phase FCC CrCoNi medium entropy alloy. Data in Brief 27 (2019) 104592

Kamarád J., Friák M., Kastil J., Schneeweiss O., Šob M., Dlouhý A.: Effect of high pressure on magnetic properties of CrMnFeCoNi high entropy alloy. J. Magn. Magn. Mater. 487 (2019) 165333


2018

Wu X., Dlouhý A., Eggeler Y., Spiecker E., Kostka A., Somsen C., Eggeler G.: On the nucleation of planar faults during low temperature and high stress creep of single crystal Ni-base superalloys. Acta Mater. 144 (2018) 642-655


2017

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

Hadraba H., Chlup Z., Dlouhý A., Dobeš F., Roupcová P., Vilémová M., Matějíček J.: Oxide dispersion strengthened CoCrFeNiMn high-entropy alloy. Mater. Sci. Eng. A 689 (2017) 252-256

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

Schneeweiss O., Friák M., Dudová M., Holec D., Šob M., Kriegner D., Holý V., Beran P., George E., Neugebauer J., Dlouhý A.: Magnetic properties of the CrMnFeCoNi high-entropy alloy. Phys. Rev. B 96 (2017) 014437


2016

Otto F., Dlouhý A., Pradeep K., Kuběnová M., Raabe D., Eggeler G., George E.: Decomposition of the single-phase high-entropy alloy CrMnFeCoNi after prolonged anneals at intermediate temperatures. Acta Mater. 112 (2016) 40-52

Wu X., Wollgramm P., Somsen C., Dlouhý A., Kostka A., Eggeler G.: Double minimum creep of single crystal Ni-base superalloys. Acta Mater. 112 (2016) 242-260

Yardley V., Povstugar I., Choi P., Raabe D., Parsa A., Kostka A., Somsen C., Dlouhý A., Neukin K., George E., Eggeler G.: On Local Phase Equilibria and the Appearance of Nanoparticles in the Microstructure of Single-Crystal Ni-Base Superalloys. Adv. Eng. Mater. 18 (2016) 1556-1567


2015

Parsa A., Wollgramm P., Buck H., Kostka A., Somsen C., Dlouhý A., Eggeler G.: Ledges and grooves at gama/gama´ interfaces of single crystal superalloys. Acta Mater. 90 (2015) 105-117

Záležák T., Dlouhý A.: 3D Discrete Dislocation Dynamics: Influence of Segment Mobility on Critical Shear Stress. Acta Phys. Pol. A 128 (2015) 654-656