National Repository of Grey Literature 296 records found  beginprevious287 - 296  jump to record: Search took 0.01 seconds. 

Ševc, P. ; Janovec, J. ; Výrostková, A. ; Svoboda, Milan ; Grabke, H. J. ; Viefhaus, H. ; Mayer, K. H.
The interfacial and microstructural studies after tempering and long-term aging (steels 9Cr1MoVNbB and 10Cr1Mo1WVNbN) and relaxation strength tests (steel TAF650) were performed. Transgranular cleavage was found to be prevalent fracture mechanism of samples impact fractured at about -100°C. Portion of intergranular facets on analyzed fracture surfaces was extremely low. Low GB concentration of phosphorus (below 1 at.%) was detected in all experimental states. No boron was observed in the AES spectra of the investigated steels.
The effect of thermal treatment on the microstructure of plasma sprayed coatings
Matyáš, V. ; Buršík, Jiří
Several types of plasma sprayed protective coatings on Ni-based substrates were studied in the as-deposited state and after long term annealing at 1173 and 1273 K by means of analytical electron microscopy. The microstructure changes were detected and quantified.
Plasma sprayed protective coatings studied by analytical electron microscopy
Matyáš, V. ; Buršík, Jiří
The formation of Al-rich phase dominates the microstructural changes at the interface of plasma sprayed protective coatings on Ni-based substrates during long term annealing at 1173 and 1273 K. Other changes in coating microstructure were detected and quantified by means of analytical electron microscopy.
Study of phase equilibria in Al-Cr-Ni-W and Al-Cr-Ni-Co alloys
Picha, R. ; Buršík, Jiří ; Brož, P.
The quaternary systems Ni-Al-Cr-W and Ni-Al-Cr-Co were studied after long term annealing at 1173 K by means of analytical electron microscopy. The experimentally obtained quantitative parameters were used for thermodynamic modelling of phase equilibria using software Thermocalc.
Study and modelling of the gamma and gamma prime phase equilibrium in Ni-Al-Cr-Co system
Brož, P. ; Buršík, Jiří ; Picha, R.
Several alloys of Ni-Al-Cr-Co system with constant Ni content of 70 at. % were studied after long term annealing at 1173 and 1273 K by means of analytical electron microscopy. The quantitative structural parameters showed good agreement with calculated data obtained by means of the software Thermocalc. Optimization of some thermodynamic parameters was performed.
Recent developments in understanding structure-property relationship in composite materials
Sklenička, Václav ; Pahutová, Marie ; Kuchařová, Květa
The paper is concerned with the creep properties of metal matrix composites in which the metallic matrix is reinforced through ceramic short-fibres and particles. The future development of the composites is briefly discussed.
Properties of NiCrW alloys during long-term high-temperature annealing
Kudrman, J. ; Podhorná, B. ; Hrbáček, K. ; Sklenička, Václav
The results of investigation of mechanical properties and their changes during long-term annealing are presented for model NiCrWC alloys. The relationship between the alloy properties and its microstructure is discussed.
Creepové chování modifikované 9 Cr martenzitické oceli po dlouhodobém žíhání
Sklenička, Václav ; Kudrman, J. ; Kuchařová, Květa ; Míková, R. ; Kloc, Luboš ; Svoboda, Milan
The results show that the creep resistance of the aged steels is considerably deteriorated by comparison with steels in the as-received state in the dislocation creep regime.By contrast, no significant effect of microstructural stability on creep behaviour was found in a regime of viscous creep.
Microstructure and phase composition of rapidly solidified Al-Ni-Zr alloys
Verner, J. ; Vojtěch, D. ; Bártová, Barbora ; Gemperle, Antonín ; Studnička, Václav
Aluminium alloys with transition elements prepared by rapid qienchinf methods have tendencies to form nanocrystalline and amorphous structures. These alloys high tensile strength and good stability at higher temperature. Microstructure, phase composition and changes at elevated temperature of AlNi 18.5 and AlNi 17 Zr 1.8 alloys have been investigated in our experimental study.

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