scholarly journals Evolution of structure and local magnetic fields during crystallization of HITPERM glassy alloys studied by in situ diffraction and nuclear forward scattering of synchrotron radiation

2015 ◽  
Vol 17 (42) ◽  
pp. 28239-28249 ◽  
Author(s):  
Marcel Miglierini ◽  
Márius Pavlovič ◽  
Vít Procházka ◽  
Tomáš Hatala ◽  
Gerhard Schumacher ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Metallic Glasses ◽  
Local Structure ◽  
Hyperfine Interactions ◽  
Nuclear Forward Scattering ◽  
Glassy Alloys ◽  
Evolution Of Structure ◽  
Local Magnetic Fields ◽  
In Situ Diffraction

In situ transformation of local structure and hyperfine interactions are simultaneously followed in real time during temperature annealing of metallic glasses.

scholarly journals On the Formation of Nanocrystalline Grains in Metallic Glasses by Means of In-Situ Nuclear Forward Scattering of Synchrotron Radiation

Nanomaterials ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 544 ◽  
Author(s):  
David Smrčka ◽  
Vít Procházka ◽  
Vlastimil Vrba ◽  
Marcel Miglierini
Keyword(s):  
Magnetic Field ◽  
Synchrotron Radiation ◽  
External Magnetic Field ◽  
Metallic Glasses ◽  
Hyperfine Interactions ◽  
Transformation Process ◽  
Forward Scattering ◽  
Point Of View ◽  
Nuclear Forward Scattering

Application of the so-called nuclear forward scattering (NFS) of synchrotron radiation is presented for the study of crystallization of metallic glasses. In this process, nanocrystalline alloys are formed. Using NFS, the transformation process can be directly observed during in-situ temperature experiments not only from the structural point of view, i.e., formation of nanocrystalline grains, but one can also observe evolution of the corresponding hyperfine interactions. In doing so, we have revealed the influence of external magnetic field on the crystallization process. The applied magnetic field is not only responsible for an increase of hyperfine magnetic fields within the newly formed nanograins but also the corresponding components in the NFS time spectra are better identified via occurrence of quantum beats with higher frequencies. In order to distinguish between these two effects, simulated and experimental NFS time spectra obtained during in-situ temperature measurements with and without external magnetic field are compared.

scholarly journals Fast-current-heating devices to study in situ phase formation in metallic glasses by using high-energy synchrotron radiation

2020 ◽  
Vol 91 (7) ◽  
pp. 073901
Author(s):  
Jiri Orava ◽  
Konrad Kosiba ◽  
Xiaoliang Han ◽  
Ivan Soldatov ◽  
Olof Gutowski ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Phase Formation ◽  
Metallic Glasses ◽  
High Energy

Measurement of Stress in Phosphated-Iron Oxide Layers by In-Situ Diffraction of Synchrotron Radiation

2002 ◽  
Vol 404-407 ◽  
pp. 809-816 ◽  
Author(s):  
Benoit Panicaud ◽  
Pierre Olivier Renault ◽  
Jean Luc Grosseau-Poussard ◽  
J.F. Dinhut ◽  
D. Thiaudière ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Synchrotron Radiation ◽  
Oxide Layers ◽  
In Situ Diffraction

Local Structures around Zr, Ni and Cu for the Zr67Cu33 and Zr67Ni33 Metallic Glasses

2007 ◽  
Vol 539-543 ◽  
pp. 1959-1963 ◽  
Author(s):  
M. Matsuura ◽  
Masaki Sakurai ◽  
Wei Zhang ◽  
A. Inoue
Keyword(s):  
Synchrotron Radiation ◽  
Metallic Glasses ◽  
Local Structure ◽  
Liquid State ◽  
Local Structures ◽  
The Stability

XAFS measurements of the Cu, Ni and Zr K-edges for the melt-quenched Zr67Cu33 and Zr67Ni33 metallic glasses were curried out using synchrotron radiation at 20K. Fitting calculations for the EXAFS results reveal that local structure around Ni and Zr in Zr67Ni33 is well represented by those for the crystalline Zr2Ni, while local structure around Zr in Zr67Cu33 is better fitted by an icosahedron rather than crystalline Zr2Cu. Such differences of the local structure attribute to the differences of the stability of super-cooled liquid state and glass formability between Zr67Cu33 and Zr67Ni33 metallic glasses.

Thermal Stability of Retained Austenite in Low Alloyed TRIP-Steel Determined by High Energy Synchrotron Radiation

2013 ◽  
Vol 772 ◽  
pp. 129-133
Author(s):  
Stefan Brauser ◽  
Arne Kromm ◽  
Eitan Dabah ◽  
Thomas Kannengiesser ◽  
Michael Rethmeier
Keyword(s):  
Synchrotron Radiation ◽  
High Energy ◽  
Heating Process ◽  
Austenitic Phase ◽  
Trip Steels ◽  
The Stability ◽  
In Situ Diffraction ◽  
Kinetics Of ◽  
Thermal Stability Of

TRIP-steels offer a good combination between strength and ductility. Therefore TRIP-steels are widely used in the automobile industries. The aim of this work is to study the stability of involved phases during heating and to identify the kinetics of the occuring phase transformations. For that purpose, in-situ diffraction measurements, using high energy synchrotron radiation were conducted. The analysis revealed the decomposition of the metastable austenitic phase into carbide and ferrite along the heating process and the regeneration of the austenite by further heating of the sample.

Metastable Phase Formation in Undercooled Nd-Fe-B Alloys Investigated by In Situ Diffraction Using Synchrotron Radiation

2006 ◽  
Vol 508 ◽  
pp. 81-86 ◽  
Author(s):  
Joern Strohmenger ◽  
Thomas Volkmann ◽  
J.R. Gao ◽  
Dieter M. Herlach
Keyword(s):  
Synchrotron Radiation ◽  
Metastable Phase ◽  
European Synchrotron Radiation Facility ◽  
Wide Composition Range ◽  
Short Period ◽  
Metastable Phase Formation ◽  
Undercooled Melt ◽  
Electromagnetically Levitated ◽  
In Situ Diffraction

Diffraction experiments on electromagnetically levitated Nd-Fe-B alloys during solidification of the undercooled melt have been performed at the European Synchrotron Radiation Facility (ESRF). By using high intensity synchrotron radiation complete diffraction spectra could be detected within a short period of some seconds thus enabling the observation of metastable solidification products that exhibits a limited lifetime. A metastable phase that crystallizes in wide composition range and that initiates the solidification of the stable Nd2Fe14B1-phase (φ-phase) have been observed.

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