The effect of refractory metals on the magnetic properties of {alpha}-Fe/R{sub 2}Fe{sub 14}B-type nanocomposites

Journal Article · Wed Sep 01 00:00:00 EDT 1999 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers)

DOI:https://doi.org/10.1109/20.800493· OSTI ID:20000750

Chang, W C; Wang, S H; Chang, S J; Tsai, M Y; Ma, B M

The phase transformations and magnetic properties of rare earth lean and boron rich (Nd{sub 0.95}La{sub 0.05}x)Fe{sub bal.}M{sub 2}B{sub 10.5}, where x = 9.5 or 11 and M = Cr, Ti, Nb, V, Mo, Zr, Hf, Ta, Mn or W, melt spun ribbons have been investigated. Two magnetic phases, namely {alpha}-Fe and R{sub 2}Fe{sub 14}B, were found in ribbons studied. A third magnetic phase, the R{sub 2}Fe{sub 23}B{sub 3}, was also detected in (Nd{sub 0.95}La{sub 0.05}){sub 9.5}Fe{sub 78}M{sub 2}B{sub 10.5} (M = Mo and Mn). Remanence (B{sub r}) and coercivity ({sub i}H{sub c}) values in the range of 8.0 to 9.1 kG and 9.5 to 18.9 kOe, respectively, have been achieved in nanocomposites with merely two magnetic phases. Among compositions studied, the Ti and W-substitutions were found to be most effective in increasing the B{sub r} and {sub i}H{sub c}, respectively. For a fixed refractory metal substitution, namely M = Cr, Ti or Nb, an increase in the total rare earth concentration resulted in nanocomposites of small grain sizes and a high volume fraction of the R{sub 2}Fe{sub 14}B phase. The combination of fine grain size and high volume fraction of R{sub 2}Fe{sub 14}B phase led to an increase in the {sub i}H{sub c} and maximum energy product, (BH){sub max}, of nanocomposites studied. A B{sub r} of 9.1 kG, {sub i}H{sub c} of 16.7 kOe and (BH){sub max} of 16.8 MGOe have been obtained on (Nd{sub 0.95}La{sub 0.05}){sub 11}Fe{sub 76.5}Ti{sub 2}B{sub 10.5}.

• Research Organization: Chung Cheng Univ., Ming-Hsiung, Chia-Yi (TW)
• OSTI ID: 20000750
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers), Vol. 35, Issue 5Pt2; Conference: 1999 international magnetics conference (Intermag '99), Kyongju (KR), 05/18/1999--05/21/1999; Other Information: PBD: Sep 1999; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
PHASE TRANSFORMATIONS
MAGNETIC PROPERTIES
LAYERS
COMPOSITE MATERIALS
IRON-ALPHA
IRON BASE ALLOYS
BORON ALLOYS
REFRACTORY METALS
METALLURGICAL EFFECTS