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Atom probe tomography of interfaces in ceramic films and oxide scales
Stiller, K.,Thuvander, M.,Povstugar, I.,Choi, P.P.,André,n, H.-O. Cambridge University Press (Materials Research Soc 2016 MRS bulletin Vol.41 No.1
<▼1><B>Abstract</B><P/></▼1><▼2><P>Atomic-scale characterization of interfaces in ceramic materials is needed in order to fully understand their electronic, ionic, mechanical, magnetic, and optical properties. The latest development of laser-assisted atom probe tomography (APT), as well as new specimen preparation methods, have opened the realm of ceramics for structural and chemical characterization with high sensitivity and nearly atomic spatial resolution. This article reviews recent APT investigations of interfaces in thin nitride films and thermally grown oxides: TiAlN layers and oxide scales on alumina- and chromia-formers and Zr alloys. The selected examples highlight the role of interfaces in the decomposition of films and in transport processes.</P></▼2>
Choi, Pyuck-Pa,Povstugar, Ivan The Korean Powder Metallurgy Institute 2012 한국분말재료학회지 (KPMI) Vol.19 No.1
The present paper gives an overview about the Atom Probe Tomography technique and its application to powder materials. The preparation of needle-shaped Atom Probe specimens from a single powder particle using focused-ion-beam milling is described. Selected experimental data on mechanically alloyed (and sintered) powder materials are presented, giving insight into the atomic-scale elemental redistribution occurring under powder metallurgical processing.
Morsdorf, L.,Pradeep, K. G.,Herzer, G.,Ková,cs, A.,Dunin-Borkowski, R. E.,Povstugar, I.,Konygin, G.,Choi, P.,Raabe, D. American Institute of Physics 2016 JOURNAL OF APPLIED PHYSICS - Vol.119 No.12
<P>Nucleation of soft magnetic Fe3Si nanocrystals in Cu-free Fe74.5Si15.5Nb3B7 alloy, upon rapid (10 s) and conventional (30 min) annealing, was investigated using x-ray diffraction, transmission electron microscopy, Mossbauer spectroscopy, and atom probe tomography. By employing rapid annealing, preferential nucleation of Fe3Si nanocrystals was achieved, whereas otherwise there is simultaneous nucleation of both Fe3Si and undesired Fe-B compound phases. Analysis revealed that the enhanced Nb diffusivity, achieved during rapid annealing, facilitates homogeneous nucleation of Fe3Si nanocrystals while shifting the secondary Fe-B crystallization to higher temperatures resulting in pure soft magnetic nanocrystallization with very low coercivities of similar to 10 A/m. (C) 2016 AIP Publishing LLC.</P>