Effect of Wheel Speed and Boron Content on Microstructure and Crystallographic Texture of Boron Substituted Sm-Co Melt Spun Ribbons

The Sm(Co0.71Fe0.1Cu0.12Zr0.04B0.03)7.5 (2:17 type magnet) melt spun ribbons have been produced from bulk as cast samples at low (5 m/sec) to medium (40 m/sec) wheel speed by the melt spinning technique. The crystallographic texture on wheel side, the microstructural characteristics and magnetic properties have been investigated. The soft magnetic fcc-Co forms a very high degree of texture especially at low velocities but for the first time a degree of texturing has been remarked on fcc-Co grains. Diffraction patterns have been traced by x-ray scattering using Cu-Kα radiation on the wheel and free side of the ribbons. In the pattern of ribbons which have been produced at 5 m/sec the (002) plane of fcc-Co is almost the dominant peak while at 40 m/sec this peak diminishes in parallel to the appearance of the structure type TbCu7 and (111) plane of fcc-Co structure. Scanning electron microscopy on the wheel side of the ribbons has been used to observe microstructural characteristics and showed that the formation of texture is attributed to the appearance of dendrites, with their long axis parallel to the longitudinal direction of the ribbons. Dendrites’ density depends on the wheel speed of the roller and boron content. It decreases as the velocity increases while for constant velocity of about 40 m/sec, higher boron content stabilizes higher degree of texturing. Magnetic properties are also examined from low to medium wheel speed by also using the magnetooptical Kerr microscopy. Therefore coercive field as high as 3.4 kOe and reduced remanence (mr) of ~0.76 has been detected from the hysteresis curve for as spun Sm Co0.71Fe0.1Cu0.12Zr0.04B0.03)7.5 ribbons at 5 m/sec.

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Influence of Co-Doping on Magnetic Properties and Magnetocaloric Effect of Fe–Co–Zr–Cu–B Melt-Spun Ribbons

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2021.19099 ◽

2021 ◽

Vol 21 (4) ◽

pp. 2552-2557

Author(s):

Nguyen Hai Yen ◽

Nguyen Hoang Ha ◽

Pham Thi Thanh ◽

Nguyen Huy Ngoc ◽

Tran Dang Thanh ◽

...

Keyword(s):

Magnetic Properties ◽

Magnetocaloric Effect ◽

Melt Spinning ◽

Room Temperature ◽

Tangential Velocity ◽

Magnetic Behavior ◽

Entropy Change ◽

Co Doping ◽

Melt Spun ◽

Melt Spun Ribbons

In this work, we investigated magnetic properties and magnetocaloric effect in Fe90−xCoxZr7Cu1B2 (x = 0, 1, 2, 3 and 4) melt-spun ribbons. The ribbons were prepared by using a melt-spinning method with a tangential velocity of a copper wheel of 40 m·s-1. The obtained ribbons are almost amorphous. The alloys exhibit typical soft magnetic behavior with low coercivity at room temperature. A minor replacement of Fe by Co gives an increment in Curie temperature (TC) of the alloys to higher temperatures. The TC of the alloys increases from 242 to 342 K with an increase of x from 0 to 4. Maximum magnetic entropy change, ΔSm max, of the alloys, was found to be larger than 0.7 J·kg-1·K-1 in a magnetic field change ΔH of 12 kOe for all the concentrations of Co. High refrigerant capacitys (RC >100 J ·kg-1 with ΔH = 12 kOe) at room temperature region have been obtained for the alloys. The large magnetocaloric effect near room temperature suggests that the alloys can be considered as magnetic refrigerants in the range of 250–350 K.

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Effect of super-heat treatment and quenching wheel speed on the structure and magnetic properties of Fe–Si–Nb–Cu–B–Al–Ge melt spun ribbons

Journal of Non-Crystalline Solids ◽

10.1016/j.jnoncrysol.2007.08.036 ◽

2008 ◽

Vol 354 (14) ◽

pp. 1487-1493 ◽

Cited By ~ 19

Author(s):

F. Shahri ◽

A. Beitollahi

Keyword(s):

Heat Treatment ◽

Magnetic Properties ◽

Wheel Speed ◽

Melt Spun ◽

Melt Spun Ribbons

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Melt spinning process and its effect on the magnetic properties and structures of SM(CO, FE, CU, ZR)Z melt-spun ribbons

2015 IEEE Magnetics Conference (INTERMAG) ◽

10.1109/intmag.2015.7157727 ◽

2015 ◽

Author(s):

Z. Liu ◽

Y. Fang ◽

W. Sun ◽

H. Chen ◽

M. Zhu ◽

...

Keyword(s):

Magnetic Properties ◽

Melt Spinning ◽

Melt Spun ◽

Spinning Process ◽

Melt Spun Ribbons

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Effect of quenching wheel speed on the structure, magnetic properties and magnetoimpedance effect in Co64Fe4Ni2B19−xSi8Cr3Alx (x=0, 1 and 2) melt-spun ribbons

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2010.04.007 ◽

2010 ◽

Vol 322 (18) ◽

pp. 2680-2683 ◽

Cited By ~ 7

Author(s):

A. Keyvanara ◽

R. Gholamipour ◽

Sh. Mirdamadi ◽

F. Shahri ◽

T. Salavati-fard ◽

...

Keyword(s):

Magnetic Properties ◽

Wheel Speed ◽

Melt Spun ◽

Melt Spun Ribbons

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The Effect of Quenching Rate on Structure and Soft Magnetic Properties of High Bs Fe-Based Nanocrystalline Alloys

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.829.78 ◽

2013 ◽

Vol 829 ◽

pp. 78-81

Author(s):

Farzad Hosseini-Nasb ◽

Ali Beitollahi ◽

Mohammad Kazem Moravvej-Farshi

Keyword(s):

Grain Size ◽

Melt Spinning ◽

Amorphous Matrix ◽

Wheel Speed ◽

Soft Magnetic Materials ◽

Soft Magnetic ◽

Quenching Rate ◽

Melt Spun ◽

Melt Spun Ribbons ◽

Good Agreement

Recently some nanocrystalline soft magnetic materials containing nanosized α-Fe grains have been obtained by crystallization of amorphous melt-spun ribbons. These structures are nanocomposites in which nanosized grains are distributed within an amorphous matrix. The soft magnetic ribbons composed of Fe80B10Si8Nb1Cu1 alloy were prepared by melt spinning method with different quenching rates (wheel speed of 10, 20 and 40 m/s). The XRD results exhibit an increase in the copper wheel speed (quenching rate) causes the fraction of crystallinity and grain size to decrease. The grain size varies in the range of 20 to 200 nm that is in good agreement with TEM results. The VSM results show that these nanostructured samples exhibit coercivity in the range of 10 to 30 A/m and magnetic saturation in the range of 1.5 to 1.7 T.

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