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Mean hyperfine fields at57Fe in dilute iron-based alloys studied by Mössbauer spectroscopy

100%
Idczak R., Konieczny R., Chojcan J.
Nukleonika
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2015
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vol. 60
|
issue 1
39-42
EN
The room temperature Mössbauer spectra of 57Fe were measured for numerous dilute iron-based alloys Fe1−xDx (D = Al, Co, Cr, Mn, Mo, Ni, Os, Pt, Re, Ru, Ta, Ti, V, W, Zn), annealed at 1270 K for 2 h before the measurements. The spectra were analyzed using the Hesse–Rübartsch method in order to determine the mean hyperfine magnetic field at the 57Fe nuclei as a function of concentration x of the minority component of the alloy. As the binary alloys are one-faze solid solutions of an element D in iron, a linear relationship between and x is observed. The result supports the suggestion that Mössbauer spectroscopy is a useful tool for the study of dissolution of different elements in iron.
2
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Temperature dependence of the short-range order parameter for Fe0.90Cr0.10and Fe0.88Cr0.12alloys

100%
Idczak R., Konieczny R.
Nukleonika
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2015
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vol. 60
|
issue 1
35-38
EN
The 57Fe Mössbauer spectra for the iron-based solid solutions Fe0.90Cr0.10 and Fe0.88Cr0.12 were measured at different temperatures ranging from 300 K to 900 K. Analysis of the obtained spectra shows that the distribution of impurity atoms in the two first coordination shells of 57Fe nuclei is not random and it cannot be described by the binomial distribution. Quantitatively, the effects were described in terms of the atomic short-range order (SRO) parameters and the pair-wise interaction energy with the help of a quasi-chemical type formulation introduced by Cohen and Fine. The obtained results reveal strong clustering-type correlations in the studied samples (a predominance of Fe-Fe and Cr-Cr bonds). Moreover, the changes in SRO values observed during thermal processing suggest that the distribution of Cr atoms in an α-iron matrix is strongly temperature dependent.
3
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Interactions between osmium atoms dissolved in iron observed by the57Fe Mössbauer spectroscopy

100%
Konieczny R., Idczak R., Chojcan J.
Nukleonika
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2015
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vol. 60
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issue 1
75-79
EN
The room temperature 57Fe Mössbauer spectra for binary iron-based solid solutions Fe1−xOsx, with x in the range 0.01 ≤ x ≤ 0.05, were analyzed in terms of binding energy Eb between two Os atoms in the Fe-Os system. The extrapolated values of Eb for x = 0 were used for computation of enthalpy of solution of osmium in iron. The result was compared with that resulting from the cellular atomic model of alloys by Miedema. The comparison shows that our findings are in qualitative agreement with the Miedema's model predictions.
4
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The Role of Microstructure in High Temperature Tribology of Iron Alloys

75%
Krawczyk J., Rożniata E., Zimowski S., Kot M., Dądrowski R., Dziurka R., Frocisz Ł.
Archives of Metallurgy and Materials
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2018
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vol. 63
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issue 2
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