Formation and decomposition of Fe3B/Nd2Fe14B nanocomposite structure in Fe–Nd–B–Cr melt-spun ribbons under isothermal annealing
1999; American Institute of Physics; Volume: 85; Issue: 8 Linguagem: Inglês
10.1063/1.369912
ISSN1520-8850
AutoresK. Suzuki, J. M. Cadogan, Minoru Uehara, S. Hirosawa, H. Kanekiyo,
Tópico(s)Metallic Glasses and Amorphous Alloys
ResumoThe decomposition process of the precursor amorphous phase in Nd5Fe77−xB18Crx (x=0 and 3) has been studied by means of x-ray diffractometry and Mössbauer spectroscopy with particular attention paid to the formation of Nd2Fe14B induced by Cr. Amorphous Nd5Fe74Cr3B18 was confirmed to decompose to stable α-Fe/Fe2B/NdFe4B4 via metastable Fe3B/Nd2Fe14B during isothermal annealing at 953 K. However, the metastable formation of magnetically hard Fe3B/Nd2Fe14B in the Cr-added system is spoiled by a preannealing treatment at 873 K which alters the metastable decomposition products from Fe3B/Nd2Fe14B to Fe3B/Nd2Fe23B3. We discuss the Cr-induced formation of Nd2Fe14B from the viewpoint of kinetics.
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