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Title: Mayerling Martinez Celis: On the role of impurities on spheroidal graphite degeneracy in cast irons
Number: 66/21
Status: Closing date exceeded
Begin: Čtvrtek, 09.12. 2021, 14:00
Tutor: Václav Holý, Milan Dopita
Location: The seminar will be held on Thursday, December 9 at 2pm in room F2, MFF UK Ke Karlovu 2, and via the zoom meeting: 91749453028

nanocent


Nano Seminar

Thursday, 9. 12. 2021, 14.00

Lecture room F2, MFF UK Ke Karlovu 5
and via the zoom meeting: https://cesnet.zoom.us/j/91749453028
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Mayerling Martinez Celis

Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic

On the role of impurities on spheroidal graphite degeneracy in cast irons

Though manufacturing spheroidal graphite cast irons is a well-established industrial process, good nodularity which is essential for mechanical properties may be hampered by several factors. Amongst them is the presence of impurities at trace level which lead to the growth of protrusions and the question is how they can destroy the spheroidizing effect of magnesium. For the first time, it is shown that such impurities are present together with magnesium at the interface between spheroid and protrusion. For getting this result, site-specific electron transparent lamellae were prepared using Focused Ion Beam and characterized at nanometric scale using atomic resolution scanning-transmission electron microscope. It is also shown by automatic crystal orientation mapping that there is no definite crystallographic relationship between protrusions and underlying spheroids.


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