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Microstructure, magnetocaloric and mechanical properties of LaFe11.8Si1.2/Y64Co36 composites prepared by hot pressing and diffusion annealing

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Abstract

To elucidate the role of elements in the increase of 1:13 phase content in La-Fe-Si/RE-Co composites prepared by hot pressing and annealing, the diffusion behavior of Y and Co during annealing and their influence on the microstructure, magnetocaloric and mechanical properties of LaFe11.8Si1.2/ Y64Co36 composites were investigated. After annealing, Co atoms diffused into the LaFe11.8Si1.2 particles and stabilized the 1:13 phase. Y atoms reacted with Fe atoms to form the stable Y2Fe17-type phase, instead of diffusing into the 1:13 phase. As a result, the values of TC and (− ΔSM)max increased. A relatively large (− ΔSM)max of 4.94 J/(kg·K) (μ0∆H = 2 T) at a TC of ~ 223 K was observed. Y2Fe17-type phase bonded with the LaFe11.8Si1.2 particles, resulting in improved compressive strength (σbc)max of 309 MPa for a Y64Co36 content of 10wt%.

Graphical abstract

(a) Schematic diagram of synthesis of LaFe11.8Si1.2/xwt%Y64Co36 bulk composites and element diffusion; (b) Relatively large magnetic entropy changes of LaFe11.8Si1.2/xwt%Y64Co36 HT bulk composites; (c) The excellent mechanical properties of LaFe11.8Si1.2/xwt%Y64Co36 HT bulk composites.

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Data availability

The experimental datasets obtained from this research work and then the analyzed results during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Grant Nos. 51874143, 52066001); the Guangdong Basic and Applied Basic Research Foundation (Grant Nos. 2022A1515012578, 2019A1515010970); the Special Project of Foshan Scientific and Technological Innovation Team (Grant Nos. 2030032000171, 2120001010823); This research is partially supported by grants from the National Research Foundation, Prime Minister’s Office, Singapore under its Campus of Research Excellence and Technological Enterprise (CREATE) programme.

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Authors and Affiliations

  1. School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, China

    G. P. Li, X. C. Zhong, X. Huang, H. Y. Yu & Z. W. Liu

  2. Baotou Research Institute of Rare Earths, Baotou, 014030, China

    C. L. Liu & J. H. Huang

  3. Sanqiaohui (Foshan) New Materials Co., Ltd, Foshan, 528253, China

    K. W. Long

  4. School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore

    R. V. Ramanujan

  5. Singapore-HUJ Alliance for Research and Enterprise (SHARE), The Smart Grippers for Soft Robotics (SGSR) Programme, Campus for Research Excellence and Technological Enterprise (CREATE), Singapore, 138602, Singapore

    R. V. Ramanujan

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  1. G. P. Li
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Li, G.P., Zhong, X.C., Huang, X. et al. Microstructure, magnetocaloric and mechanical properties of LaFe11.8Si1.2/Y64Co36 composites prepared by hot pressing and diffusion annealing. Journal of Materials Research 38, 3720–3729 (2023). https://doi.org/10.1557/s43578-023-01094-7

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