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High-Temperature X-ray Diffraction Studies of Lattice Dynamics in Ni_{3}(Fe,Nb) Ordered Alloys

100%
Mekhrabov A.
Acta Physica Polonica A
|
1994
|
vol. 85
|
issue 3
571-578
EN
A study is performed on characteristics of lattice dynamics in the initially ordered ternary Ni_{3}(Fe_{1-x}Nb_{x}) (x = O to 10 at.%) alloys using high temperature X-ray diffractometry for the temperature range from 300 K to 1300 K. Aspects investigated included temperature and concentration dependencies of the full mean square atomic displacements Ū²_{f}, the Debye characteristic temperature Θ_{D}, and linear thermal expansion coefficient α. It is found that the Ū²_{f}, Θ_{D}, and α parameters show anomalous change at temperatures where the alloys are subjected to order-disorder phase transitions. It is further found that Nb addition results in the considerable increase in the parameters Ū²_{f} and α and decrease in Θ_{D}. Moreover, the addition of Nb stabilizes Ni_{3}Fe ordered structure and shifts the order-disorder transition to higher temperature.
2
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Synthesis and Characterization of Fe_{80}B_{20} Nanoalloys Produced by Surfactant Assisted Ball Milling

51%
Fadaie A., Akdeniz M., Mekhrabov A.
Acta Physica Polonica A
|
2014
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vol. 125
|
issue 2
597-599
EN
In this present study attempts have been made to synthesize Fe_{80}B_{20} crystalline/amorphous nanocomposite powder by using surfactant-assisted high-energy ball milling. Comparison has been made for the differences in evolved microstructure via solidification and solid state phase transformation under equilibrium and non-equilibrium processing conditions. Structural analysis reveal that initially observed Fe_2B and Fe_3B intermetallic phases tend to disappear even at 1 h milling time and eventually lead to the stabilization of α-Fe nanoparticles and possible formation of amorphous phase by increasing milling time. This resultant structure governs the magnetic behaviour of the Fe_{80}B_{20} nanoalloy.
3
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Effects of Nanoparticle Geometry and Temperature on the Structural Evolution in FeCo Nanoalloys

51%
Yalçin M., Mekhrabov A., Akdeniz M.
Acta Physica Polonica A
|
2014
|
vol. 125
|
issue 2
600-602
EN
Effects of nanoparticle size (2.0-6.0 nm) and shape (spherical and cubic) on structural characteristic of atomic ordering processes and order-disorder transformation in B2-type ordered equiatomic-FeCo nanoalloys have been studied by combining electronic theory of alloys in the pseudopotential approximation with Ising-type Hamiltonian site exchange Monte Carlo simulation method. Structural evolutions in amorphous nanoparticles (2-6 nm) of Fe_{50}Co_{50} alloy have been utilized via molecular dynamic simulations from room temperatures to 1700 K temperatures. It has been shown that disordering starts at surface and propagates into volume of nanoparticles with increasing temperature. FeCo nanoparticles with critical dimensions more than 5 nm have order-disorder transformation behavior almost similar with bulk B2-FeCo alloys irrespective of their shape. Molecular dynamic analyses indicate that short- and medium-range ordered atomic structures exist in quenched Fe_{50}Co_{50} nanoparticles at room temperature. Deformed bcc structures and deformed icosahedron structures are most probable atomic configurations for 2, 4, 6 nm particles of Fe_{50}Co_{50} nanoalloy.
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