Phase Transformations and Hyperfine Interactions in Mechanically Alloyed Fe-Cu Solid Solutions

Kaloshkin, S.D.; Tomilin, I.A.; Andrianov, G. A.; Baldokhin, U.V.; Шелехов, Е.В.

doi:10.4028/www.scientific.net/msf.235-238.565

Cited by 25 publications

(19 citation statements)

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“…The formation of a QC alloy starting from the ternary mixture of Al, Cu and Fe is accompanied by a relatively large exothermal effect (about K20 kJ/mole), but it is to be considered that the characters of interaction in the individual binary pairs are strongly different. The Al-Cu and Al-Fe systems are characterized by negative heats of mixing (K25.2 kJ/mole for AlFe, K12.2 kJ/mole for Al 2 Cu, K19.9 for AlCu [53]), whereas the heat of mixing of the Fe-Cu system is significantly positive (wC15 kJ/mole, [54,55]). Hence, the forces of repulsion between Cu and Fe atoms have an important influence on the element distribution in the phases during the transformations under heating.…”

Section: Discussionmentioning

confidence: 98%

Quasicrystalline phase formation in the mechanically alloyed Al–Cu–Fe system

Tcherdyntsev¹,

Kaloshkin²,

Шелехов³

et al. 2005

Intermetallics

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Section: Discussionmentioning

confidence: 98%

Quasicrystalline phase formation in the mechanically alloyed Al–Cu–Fe system

Tcherdyntsev¹,

Kaloshkin²,

Шелехов³

et al. 2005

Intermetallics

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“…The first one is attributed to the paramagnetic behavior of Fe atoms in the FCC phase (γ-Fe) at RT which at low temperatures behaves as antiferromagnetic [15]. The second one, recalling that FCC-FeNi alloys with compositions near the Invar one, shows a paramagnetic site as a consequence of the low spin of Fe atoms in this region which interact antiferromagnetically [16,17]. Low temperature experiments are now in progress in order to elucidate the appropriate interpretation.…”

Section: Mössbauermentioning

confidence: 98%

Effect of Ni on the lattice parameter and the magnetic hyperfine field in (Fe70Al30)100 − x Ni x alloys

et al. 2009

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Samples of the (Fe 70 Al 30 ) 100−x Ni x system, with x = 5, 10, 15, and 20, were prepared by mechanical alloying using milling times of 12, 24, 36, 48, and 72 h and characterized by X-ray diffraction (XRD) and Mössbauer spectrometry (MS). XRD of all the samples allowed us to identify the BCC structure as the main component. A decreasing lattice parameter, as the milling time and Ni content increase, was obtained. The MS experiments were carried out at room temperature. The spectra were fitted with a hyperfine magnetic field distribution (HMFD). The Mean Hyperfine Fields (MHF) are ranged between 27 and 29 T with a small dependence with the milling time and was not strongly influenced by Ni content. An additional paramagnetic single line in the spectra of samples with x = 20 and that of sample with x = 15 and milled during 72 h must be included. The Mössbauer spectral area of this phase increases when the milling time increases and it was associated to an FCC phase.

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“…1, видно, что взаимная рас-творимость металлов при МАО намного превышает их равновесные значения [9] (в соответствии с диаграммами состояния, железо и кобальт в меди и медь в железе при комнатной температуре не рас-творяются вообще). Этот вывод полностью согласуется с результа-тами работ [1][2][3][4][5][6][7][8]. Для нанопорошков (НП) Cu-Fe параметры решё-ток твёрдых растворов, как на основе меди, так и на основе железа, увеличиваются при растворении в них железа и меди соответствен-но (табл.…”

Section: экспериментальные результаты и их обсуждениеunclassified

“…Это обусловлено их уникальными электрическими и магнит-ными свойствами. Бинарные системы Cu-Co и Cu-Fe были предме-том многочисленных исследований [1][2][3][4][5][6][7][8] из-за того, что они во мно-гих отношениях являются модельными [3,4,6]. Во-первых, в ре-зультате положительного значения энергии смешивания указан-ные компоненты имеют крайне малую взаимную растворимость даже при высоких температурах [9].…”

Section: Introductionunclassified