Structural and phase composition modification of nanocrystalline Nd14Fe79B7 allloy during thermomagnetic measurements

0339981 - ÚFM 2010 RIV SR eng J - Článek v odborném periodiku
Talijan, N. - Ćosović, V. - Žák, Tomáš - Grujić, A. - Stajić-Trošić, J.
Structural and phase composition modification of nanocrystalline Nd14Fe79B7 allloy during thermomagnetic measurements.
Journal of Mining and Metallurgy Section B-Metallurgy. Roč. 45, č. 1 (2009), s. 111-119. ISSN 1450-5339. E-ISSN 2217-7175
Grant CEP: GA MŠMT 1M0512
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: Neodymium rich Nd-Fe-B alloy * Thermomagnetic mesurement * X-ray diffraction * Magnetic properties
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 0.548, rok: 2009

Changes in the microstructure phase composition and magnetic properties of rapid quenched Nd-rich Nd14Fe79B7 alloy as caused by thermomagnetic measurement (TM) were studied using XRD methods of phase analysis, crystallite size and lattice microstrain determination. The changes were analysed between the optimized magnetic state and state after TM up to 800 degrees C. Measurement of magnetic properties was on the SQUID magnetometer at ambient temperature. The obtained experimental results show that the investigated alloy in the optimized magnetic state has nearly monophase composition with predominant content of hard magnetic Nd2Fe14B phase (up to 95 mass %) with mean crystallite size below 60 nm. In the state after TM, it was found that the decreased amount of Nd2Fe14B phase (75 mass %), increased amount of soft magnetic phases, predominantly of Fe7Nd5, formation of Nd-rich oxide Nd2O3 phase, as well as grain growth have caused the observed quality loss of hard magnetic properties.
Trvalý link: http://hdl.handle.net/11104/0183331