Studying nearest neighbor correlations by atom probe tomography (APT) in metallic glasses as exemplified for Fe40Ni40B20 glassy ribbons

Handle URI:
http://hdl.handle.net/10754/562038
Title:
Studying nearest neighbor correlations by atom probe tomography (APT) in metallic glasses as exemplified for Fe40Ni40B20 glassy ribbons
Authors:
Shariq, Ahmed; Al-Kassab, Talaat; Kirchheim, Reiner
Abstract:
A next nearest neighbor evaluation procedure of atom probe tomography data provides distributions of the distances between atoms. The width of these distributions for metallic glasses studied so far is a few Angstrom reflecting the spatial resolution of the analytical technique. However, fitting Gaussian distributions to the distribution of atomic distances yields average distances with statistical uncertainties of 2 to 3 hundredth of an Angstrom. Fe 40Ni40B20 metallic glass ribbons are characterized this way in the as quenched state and for a state heat treated at 350 °C for 1 h revealing a change in the structure on the sub-nanometer scale. By applying the statistical tool of the χ2 test a slight deviation from a random distribution of B-atoms in the as quenched sample is perceived, whereas a pronounced elemental inhomogeneity of boron is detected for the annealed state. In addition, the distance distribution of the first fifteen atomic neighbors is determined by using this algorithm for both annealed and as quenched states. The next neighbor evaluation algorithm evinces a steric periodicity of the atoms when the next neighbor distances are normalized by the first next neighbor distance. A comparison of the nearest neighbor atomic distribution for as quenched and annealed state shows accumulation of Ni and B. Moreover, it also reveals the tendency of Fe and B to move slightly away from each other, an incipient step to Ni rich boride formation. © 2011 Elsevier B.V.
KAUST Department:
Materials Science and Engineering Program
Publisher:
Elsevier
Journal:
Journal of Alloys and Compounds
Issue Date:
Jan-2012
DOI:
10.1016/j.jallcom.2011.09.079
Type:
Article
ISSN:
09258388
Sponsors:
The Lower Saxony's government and SFB 602 are gratefully acknowledged for the financial support of this project.
Appears in Collections:
Articles; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorShariq, Ahmeden
dc.contributor.authorAl-Kassab, Talaaten
dc.contributor.authorKirchheim, Reineren
dc.date.accessioned2015-08-03T09:43:21Zen
dc.date.available2015-08-03T09:43:21Zen
dc.date.issued2012-01en
dc.identifier.issn09258388en
dc.identifier.doi10.1016/j.jallcom.2011.09.079en
dc.identifier.urihttp://hdl.handle.net/10754/562038en
dc.description.abstractA next nearest neighbor evaluation procedure of atom probe tomography data provides distributions of the distances between atoms. The width of these distributions for metallic glasses studied so far is a few Angstrom reflecting the spatial resolution of the analytical technique. However, fitting Gaussian distributions to the distribution of atomic distances yields average distances with statistical uncertainties of 2 to 3 hundredth of an Angstrom. Fe 40Ni40B20 metallic glass ribbons are characterized this way in the as quenched state and for a state heat treated at 350 °C for 1 h revealing a change in the structure on the sub-nanometer scale. By applying the statistical tool of the χ2 test a slight deviation from a random distribution of B-atoms in the as quenched sample is perceived, whereas a pronounced elemental inhomogeneity of boron is detected for the annealed state. In addition, the distance distribution of the first fifteen atomic neighbors is determined by using this algorithm for both annealed and as quenched states. The next neighbor evaluation algorithm evinces a steric periodicity of the atoms when the next neighbor distances are normalized by the first next neighbor distance. A comparison of the nearest neighbor atomic distribution for as quenched and annealed state shows accumulation of Ni and B. Moreover, it also reveals the tendency of Fe and B to move slightly away from each other, an incipient step to Ni rich boride formation. © 2011 Elsevier B.V.en
dc.description.sponsorshipThe Lower Saxony's government and SFB 602 are gratefully acknowledged for the financial support of this project.en
dc.publisherElsevieren
dc.subjectAtom probe tomographyen
dc.subjectData analysesen
dc.subjectMetallic glassesen
dc.subjectShort range orderingen
dc.titleStudying nearest neighbor correlations by atom probe tomography (APT) in metallic glasses as exemplified for Fe40Ni40B20 glassy ribbonsen
dc.typeArticleen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.identifier.journalJournal of Alloys and Compoundsen
dc.contributor.institutionInstitute of Material Physics, Georg-August-University, Friedrich-Hund Platz 1, D-37077 Goettingen, Germanyen
dc.contributor.institutionFhG Center Nanoelectronic Technologies, Koenigsbruecker Strasse 180, D-01099 Dresden, Germanyen
kaust.authorAl-Kassab, Talaaten
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