Effect of Ti and C additions on structural and magnetic properties of (Pr,Nd)–Fe–B nanocrystalline magnetic materials

Murakami, R.K.; Rechenberg, H.; Neiva, A.C.; Missell, F.P.; Villas-Boas, Valquı́ria

doi:10.1016/j.jmmm.2008.02.150

Cited by 15 publications

(8 citation statements)

References 9 publications

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“…This effect of TiC is applicable to different 2-14-1 compositions. For example, in a previous work by Murakami et al, the addition of 3 at.% TiC to Pr9.5Fe84.5B6 alloy yielded a coercive field of 8.4 kOe without the need for any heat treatment after melt-spinning 27 . Also, the effect was reported in non-iron containing Pr2Co14B.…”

Section: 1 22 23) Melt-spun Ribbonsmentioning

confidence: 98%

Enhancement in hard magnetic properties of (Nd, Pr)–Fe–B melt-spun ribbons

Gandha

Liu

Tang

et al. 2020

Journal of Applied Physics

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The coercivity of RE2Fe14B-type permanent magnet is strongly influenced by the microstructural features such as grain boundary phases as well as grain sizes. We have combined micromagnetic simulations and experiments to elucidate the role of excess RE (Nd/Pr) in determining the resulting hard magnetic properties of Nd-Pr-Fe-B melt-spun ribbons. The intrinsic coercivity (Hc) at room temperature significantly enhanced from 9.7 kOe to 15.3 kOe with the increase in the Nd/Pr content. Also, the effect of non-magnetic grain refining refractory carbide (TiC) on both the microstructure and magnetic hardening was studied. The addition of TiC showed a very high coercivity Hc of up to 19.0 kOe at room temperature. Micromagnetic simulation indicates that the coercivity enhancement is mainly due to reduction of inter-grain magnetic interaction, which is due to RE-rich nonmagnetic grain boundary (GB) phase and/or TiC distributed at GB. This work provides useful information on the roles of non-magnetic grain boundary phases for improving the coercivity of Nd-Pr-Fe-B magnets. Combined with experimental and modeling results, we will discuss the mechanism responsible for the enhancements in coercivity and the suitability of the alloys for high performance permanent magnet development.

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Section: 1 22 23) Melt-spun Ribbonsmentioning

confidence: 98%

Enhancement in hard magnetic properties of (Nd, Pr)–Fe–B melt-spun ribbons

Gandha

Liu

Tang

et al. 2020

Journal of Applied Physics

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“…A new group of Fe-based bulk glassy alloy widely investigated in recently are Fe-Co-RE-B alloys containing RE elements such as Nd, Dy, Nb, and Pr [1][2][3][4]. The good magnetic properties in this group of alloys appear from the exchange interaction between magnetically hard and soft phases.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties and Magnetization Reversal Processes in Nanocrystalline (Pr, Dy)-(Fe, Co)-B Doped Ni and Mn Ribbons

2019

Acta Phys. Pol. A

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The magnetization reversal processes responsible for magnetic properties of rapidly solidified ribbons produced from Pr8Dy1Fe60Co7Mn6−xNixB14Zr1Ti3 alloys (where x = 0, 3, 6) were investigated. The ingot samples were obtained by arc-melting of high purity constituent elements. The single roll spinning technique was used for producing rapidly solidified ribbons. Subsequently, the ribbons were subjected to annealing at 963 K temperature for 5 min in order to induce the crystallization. The magnetic parameters were determined from magnetic hysteresis loops measured in the external magnetic field up to 2 T at room temperature. The analysis of the magnetization reversal processes in the tested materials was carried out based on measurements of recoil curves and minor hysteresis loops. The series of recoil curves were obtained for the initially saturated and for the thermally demagnetized specimens. The minor hysteresis loops were used to obtain the field dependences of remanence Jr and coercivity J Hc. In order to characterize interactions between grains of crystalline phases the δM plots were also constructed from recoil curves.

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“…Magnetic nanocomposites containing hard phase in a soft matrix as R 2 Fe 14 B/α-Fe, are promising materials for the production of resin-bonded magnets [11]. The Möss-bauer spectroscopy is a very useful and powerful technique to nd the particle size eect and the spin structure to study the supertransferred hyperne interactions in magnetic materials.…”

Section: Introductionmentioning

confidence: 99%

Study of the Effect of Boron Concentration on Magnetic and Structural Properties of Nd_7.5Pr_2.5Fe_90-xB_xMelt-Spun Alloys

Siddique

Ahmad²,

Kanwal³

et al. 2015

Acta Phys. Pol. A

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The Mössbauer spectroscopy and X-ray diraction techniques have been used to investigate the eect of boron concentration on the structural and magnetic properties of as-quenched and heat-treated melt-spun alloys Nd7.5Pr2.5Fe90−xBx (x = 6, 8, 10) produced by melt-spinning technique. X-ray diraction and Mössbauer spectroscopy results indicate that as-prepared samples are completely amorphous in nature. The X-ray diraction patterns of samples heat-treated at 700• C are indexed as Fe3B, α-Fe, (NdPr)2Fe14B and Fe23B6 phases. The Mössbauer spectra of heat-treated samples are very complex and constituted a number of sextets and a quadrupole doublet. Two main phases are (NdPr)2Fe14B hard and t-Fe3B soft magnetic phases while α-Fe and Nd23Fe6 are detected as minor phases. The average internal magnetic eld decreases with the increase of boron content; more sharply in as-prepared and comparatively slowly in heat-treated samples. The X-ray diraction and Mössbauer spectroscopy results are in good agreement with each other.

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Effect of Ti and C additions on structural and magnetic properties of (Pr,Nd)–Fe–B nanocrystalline magnetic materials

Cited by 15 publications

References 9 publications

Enhancement in hard magnetic properties of (Nd, Pr)–Fe–B melt-spun ribbons

Enhancement in hard magnetic properties of (Nd, Pr)–Fe–B melt-spun ribbons

Magnetic Properties and Magnetization Reversal Processes in Nanocrystalline (Pr, Dy)-(Fe, Co)-B Doped Ni and Mn Ribbons

Study of the Effect of Boron Concentration on Magnetic and Structural Properties of Nd_7.5Pr_2.5Fe_90-xB_xMelt-Spun Alloys

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Effect of Ti and C additions on structural and magnetic properties of (Pr,Nd)–Fe–B nanocrystalline magnetic materials

Cited by 15 publications

References 9 publications

Enhancement in hard magnetic properties of (Nd, Pr)–Fe–B melt-spun ribbons

Enhancement in hard magnetic properties of (Nd, Pr)–Fe–B melt-spun ribbons

Magnetic Properties and Magnetization Reversal Processes in Nanocrystalline (Pr, Dy)-(Fe, Co)-B Doped Ni and Mn Ribbons

Study of the Effect of Boron Concentration on Magnetic and Structural Properties of Nd7.5Pr2.5Fe90-xBxMelt-Spun Alloys

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Study of the Effect of Boron Concentration on Magnetic and Structural Properties of Nd_7.5Pr_2.5Fe_90-xB_xMelt-Spun Alloys