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

Shahri, Farzad; Beitollahi, Ali

doi:10.1016/j.jnoncrysol.2007.08.036

Cited by 30 publications

(20 citation statements)

References 20 publications

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“…The behavior of the coercivity of Fe-Co-Zr-B-Cu alloy with annealing temperature is different from that of Fe-Si-B-Nb-Cu [11] and Fe-Zr-B-Cu [13] alloys. Low coercivity is achieved in 47 and 39 m/s ribbons, which are fully/almost amorphous, and annealing has no significant effect on the coercivity.…”

Section: Discussionmentioning

confidence: 99%

“…Effect of process parameters during melt spinning on the structure and soft magnetic properties of nanocrystalline materials have been studied in Fe-Si-B-Cu-Nb [11] and Fe-Zr-Nb-B-Cu [12,13] alloys. In the case of Fe-Si-BCu-Nb alloys, Shahri et al [11] reported that lower wheel speed leads to the deterioration of soft magnetic properties due to the decrease in degree of amorphicity and increase in magnetostriction.…”

Section: Introductionmentioning

confidence: 99%

“…In the case of Fe-Si-BCu-Nb alloys, Shahri et al [11] reported that lower wheel speed leads to the deterioration of soft magnetic properties due to the decrease in degree of amorphicity and increase in magnetostriction. In the case of Fe-ZrNb-B-Cu alloys, Wu et al [12] reported that the textured sample shows inferior soft magnetic properties as compared to fully amorphous ribbons.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Melt-Spinning Parameters on the Structure and Soft Magnetic Properties of (Fe0.65Co0.35)88Zr7B4Cu1 Alloy

Babu

Srivastava

Majumdar

et al. 2010

Metall Mater Trans A

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Melt-spun ribbons of (Fe 0.65 Co 0.35 ) 88 Zr 7 B 4 Cu 1 alloy have been prepared at different wheel speeds, namely, 47, 39, 34, and 17 m/s, and subsequently annealed at 773 K (500°C) under controlled atmosphere. Structural and soft magnetic properties have been evaluated using X-ray diffraction, differential scanning calorimetry, transmission electron microscopy, and vibrating sample magnetometer. The structure of as-spun ribbons changes from fully amorphous to partially amorphous/nanocrystalline to fully nanocrystalline (bcc a-Fe(Co) + Fe 2 Zr) on decreasing the wheel speed. Annealing of amorphous ribbons leads to the precipitation of nanocrystalline bcc a-Fe(Co) phase. The Curie temperature (T c ) of the amorphous phase is found to increase with decreasing wheel speed possibly due to the effect of exchange field penetration of nanocrystals present in the amorphous matrix. The saturation magnetization (4pM s ) of as-spun ribbons having partially nanocrystalline bcc a-Fe(Co) phase is high as compared to the ribbons with completely amorphous phase, and it remains almost the same even after annealing. The lowest coercivity has been achieved in the ribbons that are fully amorphous, and the coercivity was found to increase with decreasing wheel speed.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Melt-Spinning Parameters on the Structure and Soft Magnetic Properties of (Fe0.65Co0.35)88Zr7B4Cu1 Alloy

Babu

Srivastava

Majumdar

et al. 2010

Metall Mater Trans A

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“…Many attempts of improving the properties of classical Finemet have been done up to now. They consist in searching the optimal chemical composition [3][4][5][6][7][8] as well as manufacturing conditions [9] and also thermal treatment terms [10][11].…”

Section: Introductionmentioning

confidence: 99%

Mössbauer Study of Magnetic Texture of Finemet-Type Ribbons

et al. 2011

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Magnetic texture of amorphous Finemet-type alloys substituted by Co, Ni, Mn, Ge and V was investigated by means of Mössbauer spectroscopy using various angular configurations. Samples in form of ribbons were manufactured by single-roller melt spinning technique. In most of investigated alloys some preference of alignment of atomic magnetic moments in-plane of sample is stated, except of some alloys substituted by germanium in which slight tendency to out-of plane spin orientation is proved.

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“…Some significant effects of cooling rate were also observed in several other alloy systems. In Al/Ge substituted FINEMET alloys, higher wheel velocity and higher super-heat during melt-spinning helped to produce the rapidly solidified ribbons with higher amorphicity/higher coercivity but with lower magnetic saturation and lower initial magnetic permeability [8]. In Nd-Fe-C-(B) system or Nd 2 Fe 14 B/␣-Fe nanocomposite, a more uniform structure, a stronger exchange coupling interaction and a better magnetic properties reaching a maximum value: i H c = 5.5 kOe, J r = 10.8 kG, (BH) max = 14.44 MGOe were obtained by using a specific range of wheel speed or an optimum wheel speed of 12 m/s [9,10].…”

Section: Introductionmentioning

confidence: 99%

Effect of wheel speed on the microstructures and magnetic properties of rapidly solidified Sm–Co alloys

Aich

Shield

2010

Journal of Alloys and Compounds

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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

Cited by 30 publications

References 20 publications

Influence of Melt-Spinning Parameters on the Structure and Soft Magnetic Properties of (Fe0.65Co0.35)88Zr7B4Cu1 Alloy

Influence of Melt-Spinning Parameters on the Structure and Soft Magnetic Properties of (Fe0.65Co0.35)88Zr7B4Cu1 Alloy

Mössbauer Study of Magnetic Texture of Finemet-Type Ribbons

Effect of wheel speed on the microstructures and magnetic properties of rapidly solidified Sm–Co alloys

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