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Environment-assisted crack nucleation in La(Fe,Mn,Si)13-based magnetocaloric materials.

Author(s) : WANG S., LOVELL E., GUO L., WILSON N., RYAN M. P., GIULIANI F.

Type of article: IJR article

Summary

Cracking in La(Fe,Si)13-based magnetocaloric materials has been observed to predominantly form around La-rich (La2O3) particles and pose a threat to their long-term structural integrity. To understand the formation of these cracks, FIB cross-sectional polishing followed by SEM characterisation was employed to study local microstructural evolution after air exposure. Results suggest that volume expansion and internal degradation associated with a chemical reaction between La2O3 particles and water/moisture can lead to crack nucleation in the 1:13 phase adjacent to La-rich particles. This observation indicates that the formation of La-rich particles should be suppressed, or their size minimised during material processing to ensure the long-term structural integrity of La(Fe,Mn,Si)13 magnetocaloric materials.

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Details

  • Original title: Environment-assisted crack nucleation in La(Fe,Mn,Si)13-based magnetocaloric materials.
  • Record ID : 30029383
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 135
  • Publication date: 2022/03
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2021.12.016
  • Document available for consultation in the library of the IIR headquarters only.

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