Microstructure and magnetostriction of Fe1-xTbx alloys prepared by solid-state synthesis

Pekka Ruuskanen

Research output: Contribution to journalArticleScientificpeer-review

6 Citations (Scopus)

Abstract

Fe1−xTbx was mechanically alloyed over a range of compositions 0.1<x<0.9. Based on X-ray diffraction measurements, a complete diagram of the resulting phases was drawn as a function of alloying time and composition. Depending on the composition, the microstructure of the as-milled powder is nanocrystalline or amorphous, with solubility ranges differing from those observed in the thermodynamically equilibrium structures. Terbium is soluble in the iron lattice with 0<x<0.33. A single-phase amorphous structure was isolated with x=0.33, and a single-phase Laves Fe2Tb structure with 0.4<x<0.5. At higher terbium concentrations, a mixture of Fe2Tb and terbium was obtained. The magnetic properties of the mechanically alloyed binary Fe2Tb were studied in more detail. The mechanically alloyed binary Fe2Tb powders were cold compacted and annealed. The highest magnetostriction was measured after annealing the samples at 500°C, resulting in a crystal size of 7–8 nm. Without an external load, the saturation magnetostriction λs for the nanocrystalline Fe2Tb was measured to be 1225×10−6. This is 30% higher than that of the zone-melted coarse-grained Terfenol-D with the composition of Fe2Tb0.3Dy0.7. When a constant magnetic field was applied perpendicular to the primary driving magnetic field, the saturation magnetostriction λs of the nanocrystalline Fe2Tb sample was measured to be 1582×10−6. This value is 80% higher than the magnetostriction in unstressed zone-melted Terfenol-D.
Original languageEnglish
Pages (from-to)257-268
JournalJournal of Magnetism and Magnetic Materials
Volume265
Issue number3
DOIs
Publication statusPublished - 2003
MoE publication typeA1 Journal article-refereed

Fingerprint

Magnetostriction
Terbium
magnetostriction
terbium
solid state
microstructure
Microstructure
synthesis
Chemical analysis
Magnetic fields
saturation
Nanocrystalline powders
Laves phases
Alloying
magnetic fields
Powders
alloying
Magnetic properties
Iron
solubility

Keywords

  • magnetic properties
  • magnetostriction
  • mechanical alloying
  • nanocrystalline materials

Cite this

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title = "Microstructure and magnetostriction of Fe1-xTbx alloys prepared by solid-state synthesis",
abstract = "Fe1−xTbx was mechanically alloyed over a range of compositions 0.1<x<0.9. Based on X-ray diffraction measurements, a complete diagram of the resulting phases was drawn as a function of alloying time and composition. Depending on the composition, the microstructure of the as-milled powder is nanocrystalline or amorphous, with solubility ranges differing from those observed in the thermodynamically equilibrium structures. Terbium is soluble in the iron lattice with 0<x<0.33. A single-phase amorphous structure was isolated with x=0.33, and a single-phase Laves Fe2Tb structure with 0.4<x<0.5. At higher terbium concentrations, a mixture of Fe2Tb and terbium was obtained. The magnetic properties of the mechanically alloyed binary Fe2Tb were studied in more detail. The mechanically alloyed binary Fe2Tb powders were cold compacted and annealed. The highest magnetostriction was measured after annealing the samples at 500°C, resulting in a crystal size of 7–8 nm. Without an external load, the saturation magnetostriction λs for the nanocrystalline Fe2Tb was measured to be 1225×10−6. This is 30{\%} higher than that of the zone-melted coarse-grained Terfenol-D with the composition of Fe2Tb0.3Dy0.7. When a constant magnetic field was applied perpendicular to the primary driving magnetic field, the saturation magnetostriction λs of the nanocrystalline Fe2Tb sample was measured to be 1582×10−6. This value is 80{\%} higher than the magnetostriction in unstressed zone-melted Terfenol-D.",
keywords = "magnetic properties, magnetostriction, mechanical alloying, nanocrystalline materials",
author = "Pekka Ruuskanen",
year = "2003",
doi = "10.1016/S0304-8853(03)00274-9",
language = "English",
volume = "265",
pages = "257--268",
journal = "Journal of Magnetism and Magnetic Materials",
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}

Microstructure and magnetostriction of Fe1-xTbx alloys prepared by solid-state synthesis. / Ruuskanen, Pekka.

In: Journal of Magnetism and Magnetic Materials, Vol. 265, No. 3, 2003, p. 257-268.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Microstructure and magnetostriction of Fe1-xTbx alloys prepared by solid-state synthesis

AU - Ruuskanen, Pekka

PY - 2003

Y1 - 2003

N2 - Fe1−xTbx was mechanically alloyed over a range of compositions 0.1<x<0.9. Based on X-ray diffraction measurements, a complete diagram of the resulting phases was drawn as a function of alloying time and composition. Depending on the composition, the microstructure of the as-milled powder is nanocrystalline or amorphous, with solubility ranges differing from those observed in the thermodynamically equilibrium structures. Terbium is soluble in the iron lattice with 0<x<0.33. A single-phase amorphous structure was isolated with x=0.33, and a single-phase Laves Fe2Tb structure with 0.4<x<0.5. At higher terbium concentrations, a mixture of Fe2Tb and terbium was obtained. The magnetic properties of the mechanically alloyed binary Fe2Tb were studied in more detail. The mechanically alloyed binary Fe2Tb powders were cold compacted and annealed. The highest magnetostriction was measured after annealing the samples at 500°C, resulting in a crystal size of 7–8 nm. Without an external load, the saturation magnetostriction λs for the nanocrystalline Fe2Tb was measured to be 1225×10−6. This is 30% higher than that of the zone-melted coarse-grained Terfenol-D with the composition of Fe2Tb0.3Dy0.7. When a constant magnetic field was applied perpendicular to the primary driving magnetic field, the saturation magnetostriction λs of the nanocrystalline Fe2Tb sample was measured to be 1582×10−6. This value is 80% higher than the magnetostriction in unstressed zone-melted Terfenol-D.

AB - Fe1−xTbx was mechanically alloyed over a range of compositions 0.1<x<0.9. Based on X-ray diffraction measurements, a complete diagram of the resulting phases was drawn as a function of alloying time and composition. Depending on the composition, the microstructure of the as-milled powder is nanocrystalline or amorphous, with solubility ranges differing from those observed in the thermodynamically equilibrium structures. Terbium is soluble in the iron lattice with 0<x<0.33. A single-phase amorphous structure was isolated with x=0.33, and a single-phase Laves Fe2Tb structure with 0.4<x<0.5. At higher terbium concentrations, a mixture of Fe2Tb and terbium was obtained. The magnetic properties of the mechanically alloyed binary Fe2Tb were studied in more detail. The mechanically alloyed binary Fe2Tb powders were cold compacted and annealed. The highest magnetostriction was measured after annealing the samples at 500°C, resulting in a crystal size of 7–8 nm. Without an external load, the saturation magnetostriction λs for the nanocrystalline Fe2Tb was measured to be 1225×10−6. This is 30% higher than that of the zone-melted coarse-grained Terfenol-D with the composition of Fe2Tb0.3Dy0.7. When a constant magnetic field was applied perpendicular to the primary driving magnetic field, the saturation magnetostriction λs of the nanocrystalline Fe2Tb sample was measured to be 1582×10−6. This value is 80% higher than the magnetostriction in unstressed zone-melted Terfenol-D.

KW - magnetic properties

KW - magnetostriction

KW - mechanical alloying

KW - nanocrystalline materials

U2 - 10.1016/S0304-8853(03)00274-9

DO - 10.1016/S0304-8853(03)00274-9

M3 - Article

VL - 265

SP - 257

EP - 268

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

IS - 3

ER -