TY - JOUR
T1 - Fe 50 Ni 50 synthesized by high energy ball milling
T2 - A systematic study using X-ray diffraction, EXAFS and Mössbauer methods
AU - Rodríguez, V. A.Peña
AU - Rojas-Ayala, C.
AU - Medina, J. Medina
AU - Cabrera, P. Paucar
AU - Quispe-Marcatoma, J.
AU - Landauro, C. V.
AU - Tapia, J. Rojas
AU - Baggio-Saitovitch, E. M.
AU - Passamani, E. C.
N1 - Publisher Copyright:
© 2019
PY - 2019/3
Y1 - 2019/3
N2 - Fe 50 Ni 50 alloy powder was prepared by milling the 1:1 stoichiometric mixture of Fe and Ni high purity elements using high energy vibrational ball-mill. Final powdered material was obtained directly after 30 h of milling process and the Rietveld analysis of the X-ray diffraction pattern of the sample reveals the presence of two Fe–Ni phases: the disordered γ–(Fe 45 Ni 55 ) alloy, with 91% of total fraction of the material (Fe–Ni solid solution plus grain boundary regions) and the chemically-ordered FeNi phase (9%), with L1 0 tetragonal structure. Average grain sizes of these Fe–Ni phases are respectively 60 nm and 20 nm. Results of extended X-ray absorption fine structure of Ni and Fe as well as 57 Fe Mössbauer spectroscopy also suggest the presence of atomically ordered FeNi phase. Mössbauer data have also shown that both Fe–Ni phases are magnetically ordered at room temperature. Our results indicate that high energy milling method can simulate extreme conditions of sample preparation required for the formation of the T-FeNi phase.
AB - Fe 50 Ni 50 alloy powder was prepared by milling the 1:1 stoichiometric mixture of Fe and Ni high purity elements using high energy vibrational ball-mill. Final powdered material was obtained directly after 30 h of milling process and the Rietveld analysis of the X-ray diffraction pattern of the sample reveals the presence of two Fe–Ni phases: the disordered γ–(Fe 45 Ni 55 ) alloy, with 91% of total fraction of the material (Fe–Ni solid solution plus grain boundary regions) and the chemically-ordered FeNi phase (9%), with L1 0 tetragonal structure. Average grain sizes of these Fe–Ni phases are respectively 60 nm and 20 nm. Results of extended X-ray absorption fine structure of Ni and Fe as well as 57 Fe Mössbauer spectroscopy also suggest the presence of atomically ordered FeNi phase. Mössbauer data have also shown that both Fe–Ni phases are magnetically ordered at room temperature. Our results indicate that high energy milling method can simulate extreme conditions of sample preparation required for the formation of the T-FeNi phase.
KW - Extended X-ray absorption fine structure
KW - Mechanical alloying
KW - Mössbauer spectroscopy
KW - Nanostructured materials
KW - X-ray diffraction
UR - http://www.scopus.com/inward/record.url?scp=85061193201&partnerID=8YFLogxK
U2 - 10.1016/j.matchar.2019.01.036
DO - 10.1016/j.matchar.2019.01.036
M3 - Artículo de revisión
AN - SCOPUS:85061193201
SN - 1044-5803
VL - 149
SP - 249
EP - 254
JO - Materials Characterization
JF - Materials Characterization
ER -