TY - JOUR
T1 - Magnetic properties and core losses of nanocrystalline FeMB (M Zr, Hf or Nb) alloys
AU - Makino, Akihiro
AU - Suzuki, Kiyonori
AU - Inoue, Akihisa
AU - Masumoto, Tsuyoshi
PY - 1994/5/1
Y1 - 1994/5/1
N2 - A mostly single b.c.c. phase with nanoscale grain sizes of 10-20 nm was found to form by annealing amorphous FeZrB, FeHfB and FeNbB alloys prepared by the melt-spinning method for 3.6 ks in the temperature range 773-923 K. The highest μc and Bs values reach 22 000 and 1.63 T for Fe90Zr7B3, 32 000 and 1.59 T for Fe89Hf7B4 and 22 000 and 1.49 T for Fe84Nb7B9 alloys. The low core loss of 0.066 W kg-1 at 1 T and 50 Hz was confirmed for the b.c.c. Fe89Hf7B4 alloy and is considerably smaller than that of a commercial Fe-based amorphous alloy being used in practical uses as core materials in transformer. The magnetostriction λs of FeMB alloys shows a tendency to decrease with increasing annealing temperature and is as small as -1 × 10-6 for the b.c.c. Fe89Hf7B4 alloy. The small λs and the small grain size are concluded to be the reasons for the good soft magnetic properties. The residual existence of the amorphous phase with a large amount of solute elements in the grain boundaries of the b.c.c. phase was observed by high resolution transmission electron microscopy observations on the Fe84Nb7B9 alloy annealed for 3.6 ks at 923 K and is presumed to suppress the grain growth of the nanocrystalline b.c.c. phase.
AB - A mostly single b.c.c. phase with nanoscale grain sizes of 10-20 nm was found to form by annealing amorphous FeZrB, FeHfB and FeNbB alloys prepared by the melt-spinning method for 3.6 ks in the temperature range 773-923 K. The highest μc and Bs values reach 22 000 and 1.63 T for Fe90Zr7B3, 32 000 and 1.59 T for Fe89Hf7B4 and 22 000 and 1.49 T for Fe84Nb7B9 alloys. The low core loss of 0.066 W kg-1 at 1 T and 50 Hz was confirmed for the b.c.c. Fe89Hf7B4 alloy and is considerably smaller than that of a commercial Fe-based amorphous alloy being used in practical uses as core materials in transformer. The magnetostriction λs of FeMB alloys shows a tendency to decrease with increasing annealing temperature and is as small as -1 × 10-6 for the b.c.c. Fe89Hf7B4 alloy. The small λs and the small grain size are concluded to be the reasons for the good soft magnetic properties. The residual existence of the amorphous phase with a large amount of solute elements in the grain boundaries of the b.c.c. phase was observed by high resolution transmission electron microscopy observations on the Fe84Nb7B9 alloy annealed for 3.6 ks at 923 K and is presumed to suppress the grain growth of the nanocrystalline b.c.c. phase.
UR - http://www.scopus.com/inward/record.url?scp=0028427380&partnerID=8YFLogxK
U2 - 10.1016/0921-5093(94)90178-3
DO - 10.1016/0921-5093(94)90178-3
M3 - Article
AN - SCOPUS:0028427380
SN - 0921-5093
VL - 179-180
SP - 127
EP - 131
JO - Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
JF - Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
IS - PART 1
ER -