Microstructure, magnetocaloric and mechanical properties of LaFe11.8Si1.2/Y64Co36 composites prepared by hot pressing and diffusion annealing
Source abstract
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/ Y64Co36composites were investigated. After annealing, Co atoms diffused into the LaFe11.8Si1.2particles 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 ofTCand (− ΔSM)maxincreased. A relatively large (− ΔSM)maxof 4.94 J/(kg·K) (μ0∆H= 2 T) at aTCof ~ 223 K was observed. Y2Fe17-type phase bonded with the LaFe11.8Si1.2particles, resulting in improved compressive strength (σbc)maxof 309 MPa for a Y64Co36content of 10wt%.Graphical abstract(a) Schematic diagram of synthesis of LaFe11.8Si1.2/xwt%Y64Co36bulk composites and element diffusion; (b) Relatively large magnetic entropy changes of LaFe11.8Si1.2/xwt%Y64Co36HT bulk composites; (c) The excellent mechanical properties of LaFe11.8Si1.2/xwt%Y64Co36HT bulk composites.
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Research context
OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Magnetic Properties of Alloys · Rare-earth and actinide compounds
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (34)
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