2026-04-17T01:03:28Zhttps://recercat.cat/oai/requestoai:recercat.cat:10256/127432024-06-18T11:49:36Zcom_2072_452955com_2072_2054col_2072_453063
RECERCAT
author
Suñol Martínez, Joan Josep
author
González Gasch, Àlex
author
Saurina Canals, Joan
author
Escoda i Acero, Ma. Lluïsa
author
Bruna, Pere
2024-06-18T11:49:35Z
2024-06-18T11:49:35Z
info:eu-repo/date/embargoEnd/2026-01-01info:eu-repo/date/embargoEnd/2026-01-012004-07-01
http://hdl.handle.net/10256/12743
Three nanocrystalline alloys, Fe94-xNb6Bx (x=9,14,20), were synthesized from elemental powders in a planetary high-energy ball mill. The microstructure and thermal properties of the milled powders were characterized by X-ray diffraction (XRD), transmission Mössbauer spectroscopy (TMS), scanning electron microscopy (SEM) with microanalysis, induction-coupled plasma (ICP) spectroscopy and differential scanning calorimetry (DSC).Slight contamination from milling tools and atmosphere were detected. After 80h of milling the nanocrystallites size was about 50nm. The lattice parameter increases with increasing milling time and boron content. Furthermore, the thermal stability of the nanocrystalline phase increases with increasing boron concentration. Apparent activation energies were obtained: 360±35, 305±30 and 324±35kJmol-1, respectively (associated with grain growth process). Slight differences were detected in the Mössbauer analysis. Nevertheless, in boron rich alloys increases of about 150% of the magnetic field values were obtained between 18.5 and 24TFinancial support from MICYT (project nos. MAT2000-0388 and MAT2001-0957) and DURSI (SGR2001-00190)
Tots els drets reservats info:eu-repo/semantics/embargoedAccess
Nanocristalls
Nanocrystals
Aliatges
Alloys
Aliatges -- Propietats mecàniques
Alloys -- Mechanical properties
Thermal and structural characterization of Fe-Nb-B alloys prepared by mechanical alloying
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion