Crystallization and magnetic hardening behaviour of Fe-rich FeSiBNb(Cu) melt-spun alloys
IR@NML: CSIR-National Metallurgical Laboratory, Jamshedpur
View Archive Info| Field | Value | |
| Title |
Crystallization and magnetic hardening behaviour of Fe-rich FeSiBNb(Cu)
melt-spun alloys
|
|
| Creator |
Murugaiyan, Premkumar
Bedanta, Subhankar Jena, S K Panda, A K Mitra, A Bysakh, S Roy, Rajat K |
|
| Subject |
Magnetic Properties
Alloys and Compounds Nano Composites Materials Charcterization Thermal Properties Electronic and Magnetic Properties Structural Properties |
|
| Description |
The sequential, multi-stage crystallization and magnetic hardening behaviour of Fe82B14Si2Nb2, Fe83B13Si2Nb2,
Fe83B12Si2Nb2Cu1 and Fe85B13Nb2 melt-spun alloys have been investigated. The microstructure-crystallizationmagnetic
property relationship was established using X-ray diffractometry (XRD), differential scanning calorimetry
(DSC), magnetometry, transmission electron microscopy (TEM) and magneto-optical Kerr effect microscopy
(MOKE) techniques. The increase of Fe content (> 82 at%) of as-quenched ribbons imparts microstructural
heterogeneity across the ribbon cross–section; i.e., textured α-Fe crystals at the free surface to heteroamorphous
microstructure in the bulk matrix. The isochronal annealing of hetero-amorphous alloys depicts
simultaneous surface and bulk crystallization process occurring before and after the crystallization onset temperature
(Tx1) temperature. The annealing temperature range (Ta < Tx1) coinciding with the paramagnetic
region of the thermo-magnetic plot, induces irreversible magnetic hardening due to simultaneous coarsening of
pre-existing crystal nuclei and exchange de-coupling between nanocrystal and intergranular matrix. The onset of
primary crystallization in the pre-crystallized ribbons results in bimodal nanocrystallite distribution having an
average crystallite size exceeding the ferromagnetic exchange length of Fe-based alloys. The minor Cu addition
alters the growth morphology of pre-existing nuclei from dendrite-like to equiaxed, assisting heterogeneous
nucleation and improving intergranular amorphous stability by delaying boride precipitation. The soft-magnetic
property deterioration of partially crystallized ribbons is discussed within the framework of Extended-Random
Anisotropy models.
|
|
| Publisher |
Elsevier
|
|
| Date |
2020-05-15
|
|
| Type |
Article
PeerReviewed |
|
| Format |
application/pdf
|
|
| Identifier |
http://eprints.nmlindia.org/8109/1/Crystallization_and_magnetic_hardening_behaviour_of_Fe-rich_FeSiBNb(Cu)_melt-spun_alloys_JMMM_2020.pdf
Murugaiyan, Premkumar and Bedanta, Subhankar and Jena, S K and Panda, A K and Mitra, A and Bysakh, S and Roy, Rajat K (2020) Crystallization and magnetic hardening behaviour of Fe-rich FeSiBNb(Cu) melt-spun alloys. Journal of Magnetism and Magnetic Materials, 502 (IF-2.683). p. 166528. |
|
| Relation |
https://doi.org/10.1016/j.jmmm.2020.166528
http://eprints.nmlindia.org/8109/ |
|