Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Uncovering the initial nucleation process during rapid heating of Fe-Co-Nb-B metallic glasses

Löfstrand, Julia ; Tidefelt, Mattias ; Fisk, Martin LU ; Kaplan, Maciej ; Sahlberg, Martin ; Han, Xiaoliang ; Kaban, Ivan and Jönsson, Petra E. (2025) In Materials and Design 259.
Abstract

Fe-based metal amorphous nanocomposites, consisting of dispersed nanocrystallites within an amorphous metallic glass matrix, are used as low-loss soft-magnetic components in energy conversion devices. The nanocrystallites are formed by partial devitrification of the amorphous matrix and the properties of the composite are a result of the devitrification process. Understanding the rate-dependent crystallisation kinetics is therefore essential for tailoring the properties of such nanocomposites. In this study, we monitor the devitrification process in situ during rapid heating of metallic glasses with composition (Fe0.75Co0.25)95−xNb5Bx, x=15, 20 at.%, by using high-energy wide angle... (More)

Fe-based metal amorphous nanocomposites, consisting of dispersed nanocrystallites within an amorphous metallic glass matrix, are used as low-loss soft-magnetic components in energy conversion devices. The nanocrystallites are formed by partial devitrification of the amorphous matrix and the properties of the composite are a result of the devitrification process. Understanding the rate-dependent crystallisation kinetics is therefore essential for tailoring the properties of such nanocomposites. In this study, we monitor the devitrification process in situ during rapid heating of metallic glasses with composition (Fe0.75Co0.25)95−xNb5Bx, x=15, 20 at.%, by using high-energy wide angle X-ray scattering. The results are compared to samples devitrified at low heating rates, analysed using differential scanning calorimetry, X-ray diffraction, and magnetometry. Additionally, we present a model describing the crystallisation kinetics based on classical nucleation and growth theory coupled with thermodynamic data for a generalised Fe-B system. The model successfully reproduces the onset of devitrification as a function of time, temperature, and B-concentration, thereby providing valuable insights for the design of advanced soft-magnetic metal amorphous nanocomposites.

(Less)
Please use this url to cite or link to this publication:
author
; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CALPHAD, Classical nucleation and growth theory (CNGT), HITPERM, Magnetic properties, Metal amorphous nanocomposite (MANC)
in
Materials and Design
volume
259
article number
114799
publisher
Elsevier
external identifiers
  • scopus:105017742731
ISSN
0264-1275
DOI
10.1016/j.matdes.2025.114799
language
English
LU publication?
yes
id
6a88ac49-db10-47c0-9ef5-4916df758225
date added to LUP
2025-11-24 14:04:14
date last changed
2025-11-24 14:05:31
@article{6a88ac49-db10-47c0-9ef5-4916df758225,
  abstract     = {{<p>Fe-based metal amorphous nanocomposites, consisting of dispersed nanocrystallites within an amorphous metallic glass matrix, are used as low-loss soft-magnetic components in energy conversion devices. The nanocrystallites are formed by partial devitrification of the amorphous matrix and the properties of the composite are a result of the devitrification process. Understanding the rate-dependent crystallisation kinetics is therefore essential for tailoring the properties of such nanocomposites. In this study, we monitor the devitrification process in situ during rapid heating of metallic glasses with composition (Fe<sub>0.75</sub>Co<sub>0.25</sub>)<sub>95−x</sub>Nb<sub>5</sub>B<sub>x</sub>, x=15, 20 at.%, by using high-energy wide angle X-ray scattering. The results are compared to samples devitrified at low heating rates, analysed using differential scanning calorimetry, X-ray diffraction, and magnetometry. Additionally, we present a model describing the crystallisation kinetics based on classical nucleation and growth theory coupled with thermodynamic data for a generalised Fe-B system. The model successfully reproduces the onset of devitrification as a function of time, temperature, and B-concentration, thereby providing valuable insights for the design of advanced soft-magnetic metal amorphous nanocomposites.</p>}},
  author       = {{Löfstrand, Julia and Tidefelt, Mattias and Fisk, Martin and Kaplan, Maciej and Sahlberg, Martin and Han, Xiaoliang and Kaban, Ivan and Jönsson, Petra E.}},
  issn         = {{0264-1275}},
  keywords     = {{CALPHAD; Classical nucleation and growth theory (CNGT); HITPERM; Magnetic properties; Metal amorphous nanocomposite (MANC)}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Materials and Design}},
  title        = {{Uncovering the initial nucleation process during rapid heating of Fe-Co-Nb-B metallic glasses}},
  url          = {{http://dx.doi.org/10.1016/j.matdes.2025.114799}},
  doi          = {{10.1016/j.matdes.2025.114799}},
  volume       = {{259}},
  year         = {{2025}},
}