Magnetic properties, phase evolution, and microstructure of melt spun SmCo7−xHfxCy (x=0–0.5; y=0–0.14) ribbons

Magnetic properties, phase evolution, and microstructure of melt spun SmCo7−xHfxCy (x=0–0.5; y=0–0.14) ribbons via direct quenching have been investigated. For SmCo7−xHfx series ribbons, proper volume fraction of Hf is effective to stabilize and increase the magnetocrystalline anisotropy field of the TbCu7-type structure. Accordingly, the optimal magnetic properties of Br=6.4kG, Hci=7.3kOe, and (BH)max=8.7MGOe could be obtained for x=0.1. Furthermore, a slight C addition to above alloys is helpful in refining the grain size of the ribbons from 100–400nm for C-free to 10–80nm for C-containing samples. As a result, the magnetic properties are further improved to Br=6.9kG, Hci=11.8kOe, and (BH)max=10.6MGOe for SmCo6.8Hf0.2C0.12 nanocomposite ribbons.

[1]  J. Liu,et al.  Structure and magnetic properties of SmCo 7x Ti x with TbCu 7-type structure , 2017 .

[2]  W. Li,et al.  Structure and magnetic characteristics of novel SmCo-based hard magnetic alloys , 2006 .

[3]  Quanlin Liu,et al.  Effects of the doping element on crystal structure and magnetic properties of Sm(Co,M)7 compounds (M=Si, Cu, Ti, Zr, and Hf) , 2005 .

[4]  W. Li,et al.  Structural stability and magnetic properties of SmCo7−xGax , 2005 .

[5]  L. H. Lewis,et al.  Rapidly solidified nanocomposite SmCo7/fcc Co permanent magnets , 2005 .

[6]  Jingkui Liang,et al.  Crystal structure and magnetic properties of SmCo7−xHfx compounds , 2004 .

[7]  S. Aich,et al.  Phase formation and magnetic properties of SmCo5+x alloys with the TbCu7-type structure , 2004 .

[8]  Jingkui Liang,et al.  Crystal structure and magnetic properties of SmCo5.85Si0.90 compound , 2004 .

[9]  G. Hadjipanayis,et al.  Structure and magnetic properties of RCo7−xMnx alloys (R=Sm, Gd; x=0.1–1.4) , 2002 .

[10]  X. Zhao,et al.  Phase transformation and magnetic properties of SmCo7−xBx alloys prepared by mechanical alloying , 2001 .

[11]  Ralph Skomski,et al.  Sm–Co–Cu–Ti high-temperature permanent magnets , 2000 .

[12]  M. McHenry,et al.  Structure and magnetic properties of RCo7−xZrx(R=Y, Gd, Nd, or Ho, x=0–0.8) , 2000 .

[13]  J. Liu,et al.  Structure and magnetic properties of SmCo7−xTix with TbCu7-type structure , 2000 .

[14]  G. Hadjipanayis.  Nanophase hard magnets , 1999 .

[15]  T. Chin,et al.  Intergrain exchange coupling and coercivity mechanism of nanocrystalline Sm2Fe15-xCuxSi2C (x=0 and 1) ribbons prepared by melt spinning , 1999 .

[16]  M. McHenry,et al.  STRUCTURE AND MAGNETIC PROPERTIES OF RCO7-XZRX(R=PR OR ER, X=0-0.8) , 1999 .

[17]  W. Gong,et al.  Comparison on the magnetic and structural properties of Sm(Co0.67−xFe0.25Cu0.06Zr0.02Cx)8.0, where x=0–0.15, melt spun ribbons and cast alloys , 1999 .

[18]  M. McHenry,et al.  Structure and magnetic properties of SmCo7−xZrx alloys (x=0–0.8) , 1998 .

[19]  T. Chin,et al.  Magnetic properties of microcrystalline SmCo/sub x/ alloys by melt spinning , 1996 .

[20]  Z. Altounian,et al.  Structure and magnetic properties of mechanically alloyed SmCo/sub 7/ compound , 1996 .

[21]  K. Buschow,et al.  Composition and crystal structure of hexagonal Cu-rich rare earth–copper compounds , 1971 .