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Charakterizace mikrostrtuktury kvazikrystalického aproximantu Al77,5Cr16,5Fe6
Svoboda, Milan ; Buršík, Jiří ; Janovec, J. ; Dolinšek, J.
Characterisation of the quasicrystalline approximant in Al77,5Cr16,5Fe6 alloy is the main aim of this work. The characterisation was performed by transmission electron microscopy,electron diffraction,scanning electron microscopy and energy dispersive X-ray spectroscopy. By using those methods we have identified 2 phases differing each other especially by content of iron.
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Quasicrystals in 11Cr-3W-3Co Steel
Výrostková, A. ; Svoboda, Milan ; Ševc, P. ; Janovec, J. ; Grabke, H. J.
The microstructural and phase analysis after relaxation strength tests performed at 480, 540 and 570 °C of 10Cr3WVNbB steel TAF 650 and after long term ageing at 480 and 600 °C of 10Cr1Mo1WVNbN steel were carried out. Laves phase in TAF 650 can be denoted as Fe2W type and in the 10Cr1Mo1WVNbN steel as Fe2Mo type Quasicrystalline phase of the same chemical composition as Laves phase was found in TAF 650 steel in all states examined.
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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.
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