Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Kinetics of fcc-Al nanocrystallization in Al90Tb10 metallic glass
Date
2013-10-15
Author
DEMIRTAS, T.
Kalay, Yunus Eren
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
99
views
0
downloads
Cite This
The crystallization kinetics of Al90Tb10 amorphous alloy were investigated by a combined study of differential scanning calorimetry (DSC), transmission electron microscopy (TEM), Cu-K alpha X-ray diffraction (XRD) analyses and microhardness measurements. Amorphous to fcc-Al transformation kinetics were descried through Johnson-Mehl-Avrami OMA) approach based on the isothermal DSC hold at 220 degrees C. XRD and TEM revealed the formation of highly populated (similar to 10(21) m(-3)) fcc-Al nanocrystals after the first crystallization event. JMA indicated a three dimensional diffusional growth with constant nucleation rate. TEM and XRD analyses agree well with the three dimensional diffusional growth of fcc-Al within the amorphous matrix. Nucleation of fcc-Al nanocrystals was attributed to already existing Al rich clusters embedded in the amorphous matrix. The deviation in cooling rate at the free and the wheel sides caused variations in Al rich cluster size and population through the thickness of the ribbon specimen. Microhardness tests captured this discrepancy which results in anomalous Avrami exponent, n(x).
Subject Keywords
Materials Chemistry
,
Electronic, Optical and Magnetic Materials
,
Condensed Matter Physics
,
Ceramics and Composites
URI
https://hdl.handle.net/11511/35082
Journal
JOURNAL OF NON-CRYSTALLINE SOLIDS
DOI
https://doi.org/10.1016/j.jnoncrysol.2013.06.020
Collections
Department of Metallurgical and Materials Engineering, Article
Suggestions
OpenMETU
Core
Theoretical prediction of bulk glass forming ability (BGFA) of Ti-Cu based multicomponent alloys
SUER, Sila; Mehrabov, Amdulla; Akdeniz, Mahmut Vedat (Elsevier BV, 2009-03-01)
The bulk glass forming ability (BGFA) of Ti-Cu based multicomponent alloys has been evaluated via theoretical modeling and computer simulation studies based on a combination of electronic theory of alloys in the pseudopotential approximation and the statistical thermodynamical theory of liquid alloys The. magnitude of atomic ordering energies, calculated by means of the electronic theory of alloys in the pseudopotential approximation, was subsequently used for calculation of the key thermodynamic parameters...
Phase Identification of La-Doped Hard Magnetic Barium Ferrite Using Artificial Neural Network
Sozeri, Huseyin; KÜÇÜK, İLKER; Ozkan, Husnu (Springer Science and Business Media LLC, 2011-01-01)
A model based on an artificial neural network (ANN) was designed for the simulation and estimation of 2 theta and intensity values obtained by X-Ray Diffraction (XRD) of pure and La-doped barium ferrite powders which have been synthesized in ammonium nitrate melt. Its performance is evaluated by the influences of different La content, sintering temperature, Fe/Ba ratio, and washed in HCl (or not washed in HCl) samples. The XRD patterns of samples estimated by the ANN agree well with the experimental values,...
Evolution of magnetic and structural properties of TiO2 with Co-doping
Topal, Ugur; Ozkan, Husnu; Bakan, Halil I.; Cankur, Oktay; Topal, Kevser (Elsevier BV, 2008-03-15)
This paper presents the phase formations and magnetic properties of Co-doped TiO2 synthesized by the colloidal and ammonium nitrate melt techniques (ANMT). The phase formations and ferromagnetic properties were studied with XRD and SQUID magnetometry. Crystallization of the TiO2 rutile lattice was completed at 1000 degrees C and that was preserved during annealing up to 1300 degrees C. For the samples annealed at 1200 degrees C, elemental analysis has shown that the colloidal technique leads to a single-pha...
Optical properties of (Ga2Se3)(0.)(75) - (Ga2S3)(0.)(25) single crystals by spectroscopic ellipsometry
Işık, Mehmet; Hasanlı, Nızamı; Gasanova, L. (Elsevier BV, 2019-05-01)
Structural and optical properties of 75 mol % Ga2Se3 - 25 mol % Ga2S3 system of single crystals were investigated by experimental techniques of x-ray diffraction (XRD), energy dispersive spectroscopy, Raman spectroscopy and ellipsometry. XRD pattern indicated that the studied compound has crystalline nature with cubic structure. Vibrational modes in the crystal were revealed using Raman spectroscopy experiments in the 90-450 cm(-1) frequency range and nine modes were observed in the spectrum. Ellipsometry m...
Phonon dispersions and elastic constants of disordered Pd-Ni alloys
Kart, SO; Tomak, Mehmet; Cagin, T (Elsevier BV, 2005-01-31)
Phonon frequencies of Pd-Ni alloys are calculated by molecular dynamics (MD) simulation. Lattice dynamical properties computed from Sutton-Chen (SC) and quantum Sutton-Chen (Q-SC) potentials as a function of temperature are compared with each other. We present all interatomic force constants up to the 8th nearest-neighbor shell obtained by using the calculated potential. Elastic constants evaluated by two methods are consistent with each other. The transferability of the potential is also tested. The result...
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
T. DEMIRTAS and Y. E. Kalay, “Kinetics of fcc-Al nanocrystallization in Al90Tb10 metallic glass,”
JOURNAL OF NON-CRYSTALLINE SOLIDS
, pp. 71–78, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35082.