Pavel Lukáč
Charles University in Prague
Composite numberUltimate tensile strengthDeformation (engineering)Strain rateCreepDislocationComposite materialAcoustic emissionHardening (metallurgy)MetallurgyMaterials scienceStress relaxationMagnesium alloyAlloyAtmospheric temperature rangeMagnesiumCrystal twinningMicrostructureStress (mechanics)Thermodynamics
258Publications
31H-index
3,318Citations
Publications 259
Newest
#1Zuzanka TrojanováH-Index: 20
#2Zdeněk DrozdH-Index: 9
Last. Jan DžuganH-Index: 11
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#1Zuzanka TrojanováH-Index: 20
#2Zdeněk DrozdH-Index: 9
Last. Pavel LukáčH-Index: 31
view all 8 authors...
An extruded magnesium AZ31 magnesium alloy was processed by rotary swaging (RSW) and then deformed by tension and compression at room temperature. The work-hardening behaviour of 1–5 times swaged samples was analysed using Kocks-Mecking plots. Accumulation of dislocations on dislocation obstacles and twin boundaries is the deciding factor for the strain hardening. Profuse twinning in compression seems to be the reason for the higher hardening observed during compression. The main softening mecha...
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#1Zuzanka TrojanováH-Index: 20
Last. Pavel LukáčH-Index: 31
view all 6 authors...
An AX52 magnesium alloy (nominal composition Mg-5Al-2Ca in w.%) was submitted to equal channel angular pressing (ECAP) using processing route A; 1–8 passes through the ECAP tool were applied. The thermal conductivity of the ECAP samples was measured using a flash method in the temperature interval from room temperature up to 350 °C. The microstructure and texture of the samples were studied by light and electron microscopy. The severe plastic deformation, realized by the ECAP, influences the the...
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#1Zuzanka TrojanováH-Index: 20
#2Zoltán SzárazH-Index: 8
Last. Jan DžuganH-Index: 11
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AX61 magnesium alloy was reinforced with short Saffil fibres using squeeze cast technology. Samples were cut from the casting in two directions: parallel and perpendicular to the fibre plane. Samples were deformed in compression at various temperatures from room temperature to 300 °C. Various strengthening mechanisms such as load transfer, increased dislocation density, Orowan and Hall–Petch strengthening were analysed. During deformation, the stress relaxation tests were subsequently performed....
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#1Zuzanka Trojanová (Charles University in Prague)H-Index: 20
#2Zdeněk Drozd (Charles University in Prague)H-Index: 9
Last. Manoj Gupta (NUS: National University of Singapore)H-Index: 78
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Magnesium samples reinforced with 0.7, 1.4, and 2.4 vol.% of Inconel 718 particles were prepared using a disintegrated melt deposition technique followed by hot extrusion. Mechanical properties, thermal expansion, and damping were studied with the aim of revealing the particle influence on the microstructure, texture, tensile and compressive behavior, thermal expansion coefficient, and internal friction. The flow stresses are significantly influenced by the test temperature and the vol.% of part...
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#1Zuzanka Trojanová (Charles University in Prague)H-Index: 20
#2Zdeněk Drozd (Charles University in Prague)H-Index: 9
Last. František Chmelík (Charles University in Prague)H-Index: 28
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Source
#1Daria Drozdenko (Charles University in Prague)H-Index: 11
#2Michiaki Yamasaki (Kumamoto University)H-Index: 42
Last. Yoshihito Kawamura (Kumamoto University)H-Index: 70
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Abstract The presented work is focused on the investigation of dilute Mg-Zn-Y alloys prepared by the consolidation of rapidly solidified ribbons. Particularly, the influence of both amount of the Zn and Y alloying elements (varies between 1 and 2 at.%) and the metal flow rate during extrusion on the initial microstructure and resulting mechanical properties is discussed. The average grain size of investigated alloys varies between 700 and 1200 nm. Furthermore, dispersive Zn- and Y-rich stacking ...
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#1Michal Knapek (Charles University in Prague)H-Index: 9
#2Josef Pešička (Charles University in Prague)H-Index: 18
Last. Robert Král (Charles University in Prague)H-Index: 16
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Abstract This letter presents a systematic study of serrated flow of the FeAlCrMo medium-entropy alloy in compression, first observed at 400 °C and a strain rate of ~10−4 s−1. In this work, these parameters were varied in order to evaluate how they affect the deformation behavior. Compression curves together with the acoustic emission data suggest that dynamic strain aging (the Portevin-Le Châtelier effect) is responsible for the jerky flow. Furthermore, at certain conditions, peculiar periodic ...
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#1Zuzanka TrojanováH-Index: 20
Last. Pavel LukáčH-Index: 31
view all 6 authors...
Source
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