The Effects of a High Magnetic Field on the Annealing of [(FeCo)BSi]Nb₄ Bulk Metallic Glass.

Materials (Basel, Switzerland) · 2016 · Benefit · Low evidence

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BenefitLow evidencePaper 2858

Study snapshot

PublicationMaterials (Basel, Switzerland) · 2016

Study typeengineering

Reported directionBenefit

Evidence ratingLow

Abstract

In contrast with amorphous alloys, nanocrystalline soft magnetic materials show improved thermal stability and higher soft magnetic properties. The nanocrystalline soft magnetic composites are usually fabricated by partially crystallizing from parent amorphous alloys. This paper reports our experimental observation on the sequence of crystallization in metallic glass under a high magnetic field (HMF). An application of a HMF to bulk metallic glass (BMG) of [(FeCo)BSi]Nb₄ prioritizes the precipitation of α-(Fe,Co) phase separated from the subsequent precipitation of borides, (Fe,Co)B₆, upon isothermal annealing at a glass transition temperature. Furthermore, it was observed that, through the annealing treatment under a HMF, a soft magnetic nanocomposite, in which only α-(Fe,Co) phase uniformly distributes in amorphous matrix, was achieved for boron-bearing BMG. The promotion of the α-Fe or (Fe,Co) phase and the prevention of the boride phases during the isothermal annealing process help to produce high-quality soft magnetic nanocomposite materials. The mechanism by which a HMF influences the crystallization sequence was interpreted via certain changes in Gibbs free energies for two ferromagnetic phases. This finding evidences that the annealing treatment under a HMF is suitable for enhancing the soft magnetic properties of high B content (Fe,Co)-based bulk amorphous and nanocrystalline materials.

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AI evidence extraction

Structured fields below were generated from the paper’s abstract and metadata to make the evidence easier to inspect. Automated extraction may be incomplete or incorrect; verify important details against the original paper.

Study typeengineering

Effect directionbenefit

PopulationNot supplied

Sample sizeNot supplied

Exposureisothermal annealing at a glass transition temperature

Evidence strengthLowConfidence: 74% · Peer reviewed: yes

Main findings

Applying a high magnetic field during isothermal annealing of [(FeCo)BSi]Nb4 bulk metallic glass was observed to prioritize precipitation of the α-(Fe,Co) phase and separate it from subsequent boride precipitation. Under high magnetic field annealing, a nanocomposite with only α-(Fe,Co) uniformly distributed in an amorphous matrix was reported, with prevention of boride phases and suitability for enhancing soft magnetic properties.

Outcomes measured

crystallization sequence during annealing
precipitation of α-(Fe,Co) phase
precipitation/prevention of boride phases ((Fe,Co)B6)
formation of soft magnetic nanocomposite microstructure
soft magnetic properties (enhancement)

Limitations

No magnetic field strength or exposure parameters are provided in the abstract.
No quantitative results or statistical analysis are described in the abstract.
Study is materials-focused (not a biological/health study).

View raw extracted JSON

{
  "study_type": "engineering",
  "exposure": {
    "band": null,
    "source": "high magnetic field (HMF) applied during isothermal annealing",
    "frequency_mhz": null,
    "sar_wkg": null,
    "duration": "isothermal annealing at a glass transition temperature"
  },
  "population": null,
  "sample_size": null,
  "outcomes": [
    "crystallization sequence during annealing",
    "precipitation of α-(Fe,Co) phase",
    "precipitation/prevention of boride phases ((Fe,Co)B6)",
    "formation of soft magnetic nanocomposite microstructure",
    "soft magnetic properties (enhancement)"
  ],
  "main_findings": "Applying a high magnetic field during isothermal annealing of [(FeCo)BSi]Nb4 bulk metallic glass was observed to prioritize precipitation of the α-(Fe,Co) phase and separate it from subsequent boride precipitation. Under high magnetic field annealing, a nanocomposite with only α-(Fe,Co) uniformly distributed in an amorphous matrix was reported, with prevention of boride phases and suitability for enhancing soft magnetic properties.",
  "effect_direction": "benefit",
  "limitations": [
    "No magnetic field strength or exposure parameters are provided in the abstract.",
    "No quantitative results or statistical analysis are described in the abstract.",
    "Study is materials-focused (not a biological/health study)."
  ],
  "evidence_strength": "low",
  "confidence": 0.74,
  "peer_reviewed_likely": "yes",
  "keywords": [
    "high magnetic field",
    "HMF",
    "bulk metallic glass",
    "BMG",
    "annealing",
    "isothermal annealing",
    "crystallization sequence",
    "nanocrystalline soft magnetic materials",
    "α-(Fe,Co) phase",
    "borides",
    "(Fe,Co)B6",
    "Gibbs free energy"
  ],
  "suggested_hubs": []
}

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AI-extracted fields are generated from the abstract and metadata and may be incomplete or incorrect. This material is for informational purposes and is not medical advice.

Identifiers and source

DOI: 10.3390/ma9110899
PubMed: 28774018

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