Influence of Cu Content on Structure, Thermal Stability and Magnetic Properties in Fe72−xNi8Nb4CuxSi2B14 Alloys

Warski, Tymon; Radoń, Adrian; Zackiewicz, P.; Włodarczyk, P.; Polak, Marcin; Wójcik, Anna; Maziarz, W.; Kolano-Burian, Aleksandra; Hawełek, ᴌ.

doi:10.3390/ma14040726

Cited by 10 publications

(4 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Liu et al [35] found values ranged between 138 and 356 kJ/mol in Fe-Ni-Zr-B alloys produced by mechanical alloying. The addition of Cu facilitates the reduction of (a) the crystallisation temperature and (b) the activation energy [36]. In Fe-based alloys, with a minor addition of Cu, values ranging from 177 to 233 kJ/mol were calculated [37].…”

Section: Thermal Analysismentioning

confidence: 99%

Two Fe-Zr-B-Cu Nanocrystalline Magnetic Alloys Produced by Mechanical Alloying Technique

et al. 2023

View full text Add to dashboard Cite

Fe-rich soft magnetic alloys are candidates for applications as magnetic sensors and actuators. Spring magnets can be obtained when these alloys are added to hard magnetic compounds. In this work, two nanocrystalline Fe-Zr-B-Cu alloys are produced by mechanical alloying, MA. The increase in boron content favours the reduction of the crystalline size. Thermal analysis (by differential scanning calorimetry) shows that, in the temperature range compressed between 450 and 650 K, wide exothermic processes take place, which are associated with the relaxation of the tensions of the alloys produced by MA. At high temperatures, a main crystallisation peak is found. A Kissinger and an isoconversional method were used to determine the apparent activation of the exothermic processes. The values are compared with those found in the scientific literature. Likewise, adapted thermogravimetry allowed for the determination of the Curie temperature. The functional response has been analysed by hysteresis loop cycles. According to the composition, the decrease of the Fe/B ratio diminishes the soft magnetic behaviour.

show abstract

Section: Thermal Analysismentioning

confidence: 99%

Two Fe-Zr-B-Cu Nanocrystalline Magnetic Alloys Produced by Mechanical Alloying Technique

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The crystallisation behaviour of Cu-free alloys is completely different from that of Cu-containing alloys. Additionally, the appropriate amount of Cu addition can optimise and allow the highest possible magnetic properties [ 15 , 16 ]. The co-presence of Nb and Cu can further refine the microstructure.…”

Section: Introductionmentioning

confidence: 99%

Influence of Nb and Mo Substitution on the Structure and Magnetic Properties of a Rapidly Quenched Fe79.4Co5Cu0.6B15 Alloy

Hawelek,

Zackiewicz,

Wojcik

et al. 2023

Materials

Self Cite

View full text Add to dashboard Cite

The importance of amorphous and nanocrystalline Fe-based soft magnetic materials is increasing annually. Thus, characterisation of the chemical compositions, alloying additives, and crystal structures is significant for obtaining the appropriate functional properties. The purpose of this work is to present comparative studies on the influence of Nb (1, 2, 3 at.%) and Mo (1, 2, 3 at.%) in Fe substitution on the thermal stability, crystal structure, and magnetic properties of a rapidly quenched Fe79.4Co5Cu0.6B15 alloy. Additional heat treatments in a vacuum (260–640 °C) were performed for all samples based on the crystallisation kinetics. Substantial improvement in thermal stability was achieved with increasing Nb substitution, while this effect was less noticeable for Mo-containing alloys. The heat treatment optimisation process showed that the least lossy states (with a minimum value of coercivity below 10 A/m and high saturation induction up to 1.7 T) were the intermediate state of the relaxed amorphous state and the nanocomposite state of nanocrystals immersed in the amorphous matrix obtained by annealing in the temperature range of 340–360 °C for 20 min. Only for the alloy with the highest thermal stability (Nb = 3%), the α-Fe(Co) nanograin grows, without the co-participation of the hard magnetic Fe3B, in a relatively wide range of annealing temperatures up to 460 °C, where the second local minimum in coercivity and core power losses exists. For the remaining annealed alloys, due to lower thermal stability than the Nb = 3% alloy, the Fe3B phase starts to crystallise at lower annealing temperatures, making an essential contribution to magneto-crystalline anisotropy, thus the substantial increase in coercivity and induction saturation. The air-annealing process tested on the studied alloys for optimal annealing conditions has potential use for this type of material. Additionally, optimally annealed Mo-containing alloys are less lossy materials than Nb-containing alloys in a frequency range up to 400 kHz and magnetic induction up to 0.8 T.

show abstract

“…they are also known to have low eddy current losses, due to high electric resistance and formability to a thickness of approximately 25 μm. thus, many efforts have been made to improve the magnetic properties of different groups of soft magnetic materials like Fe-si-B-nb-Cu (FineMet) [1], Fe-M-B (nAnOPeRM) [2][3][4][5][6], Fe-Co-M-B (hitPeRM; M = nb, zr, hf) [7], Fe-Co-nb-B-P (PyROPeRM) [8] and Feni-based [9][10][11][12]. soft magnetic nanocrystalline alloys are often obtained by thermal annealing of amorphous alloys, however, their magnetic properties are sensitive to chemical composition as well as microstructure.…”

Section: Introductionmentioning

confidence: 99%

TEM, HREM, L-TEM Studies of Fe-Based Soft Magnetic Melt-Spun Ribbons Subjected to Ultra-Rapid Annealing Process

Maziarz,

Kolano-Burian,

Kowalczyk

et al. 2023

Archives of Metallurgy and Materials

View full text Add to dashboard Cite

To uLTRa-Rapid annEaLing pRocESS in the present work, we performed the ultra-rapid annealing (ura) process for amorphous Fe 78 ni 8 B 14 melt-spun ribbons in order to obtain fine excellent microstructure assuring the best soft magnetic properties. several microscopic methods mainly based on transmission electron microscopy (teM) and lorentz teM (l-teM) were applied for detailed studies of the microstructure and magnetic domains structure. the investigation revealed that the optimized parameters of the uRA process (500°C/0.5-5 s) lead to outstanding soft magnetic properties. A mixture containing close to 50% amorphous phase and 50% α-Fe nanocrystals of size up to 30 nm has been already obtained after annealing for 3 s. these annealing conditions appear to be the most suitable in terms of microstructure providing the best magnetic properties.

show abstract

Influence of Cu Content on Structure, Thermal Stability and Magnetic Properties in Fe72−xNi8Nb4CuxSi2B14 Alloys

Cited by 10 publications

References 33 publications

Two Fe-Zr-B-Cu Nanocrystalline Magnetic Alloys Produced by Mechanical Alloying Technique

Two Fe-Zr-B-Cu Nanocrystalline Magnetic Alloys Produced by Mechanical Alloying Technique

Influence of Nb and Mo Substitution on the Structure and Magnetic Properties of a Rapidly Quenched Fe79.4Co5Cu0.6B15 Alloy

TEM, HREM, L-TEM Studies of Fe-Based Soft Magnetic Melt-Spun Ribbons Subjected to Ultra-Rapid Annealing Process

Contact Info

Product

Resources

About