X-ray diffraction and Mössbauer studies of nanocrystalline FeNi alloys prepared by mechanical alloying

Solid-state synthesis and phase transformations in Ni/Fe films: Structural and magnetic studies

“…Also, the Ni 3 Fe phase was found in the samples prepared by mechanical alloying and annealing at a temperature above 600 K [55,56]. The paramagnetic phase was observed in Fe-Ni alloys with Ni concentration 430 at% prepared by mechanical alloying from Fe and Ni elemental metals [22][23][24][25][26][27]. The annealing of the obtained samples at a temperature above 920 K expanded the concentration range of the paramagnetic phase existence.…”

“…These facts are consistent with our results and also may be associated with the solid-state synthesis at a temperature above T 0 3 . Such synthesis leads to the formation of paramagnetic phases between Ni and Fe grains which were not involved in the reaction during the film growth [30,31] or mechanical alloying [22][23][24][25][26][27] of Ni and Fe powders.…”

“…The transition into equilibrium state goes by phase decomposition into g-and a-phases in the case of lowtemperature annealing [7,18,19], or paramagnetic g par and ferromagnetic NiFe phases, as it was found in meteorites [4][5][6], electronic beam irradiated samples [7,20,21] and samples prepared using mechanical alloying [22][23][24][25][26][27]. The paramagnetic g par and ferromagnetic NiFe phases are indistinguishable by diffraction methods; therefore, their cell parameters are accepted to be the same.…”

X-ray diffraction, microstructure, Mössbauer and magnetization studies of nanostructured Fe50Ni50 alloy prepared by mechanical alloying

“…We would like to emphasize that for the unmilled powder, the value of the crystallite size equal to 74 nm and the internal strain of 0.018% are only given by the instrumental width of the XRD peaks. It is interesting to note that Jartych et al [17] obtained a crystallite size and lattice strain of 10 nm and 0.5% after 50 h of milling using a high-energy planetary ball mill and Djekoun et al [23] achieved a grain size value of 8 nm after 48 h of milling using Pulverisette 7 planetary ball mill. Also note that the grain size and strain values found in this work (12.9 nm and 0.41%) are comparable to those reported by Pękala et al [24] (14 nm and 0.5%) but after 400 h of milling using low-energy horizontal ball mill.…”

Mechanical alloying of the FeNi–Ag system

“…There are some reports on Fe-Ni mechanically alloyed [1][2][3][4][5][6][7][8][9] system and very limited literature on the Fe-Ni-Ag system [10]. Fe-Ag and Ni-Ag are immiscible at equilibrium and Fe-Ni shows complete solubility.…”