Large negative thermal expansion in 〈0 0 1〉 -textured AlFe2B2/epoxy composites fabricated via magnetic field-assisted dynamic self-assembly
Source abstract
Abstract
AlFe 2B 2 compounds undergo anisotropic changes in the lattice parameters across the ferromagnetic transition. The c-axis of the orthorhombic structure shows a significant lattice-level negative thermal expansion (NTE), while the a- and b-axes as well as the unit-cell volume exhibit a positive thermal expansion (PTE) character. Therefore, conventional AlFe 2B 2 bulk samples display a PTE property at the macroscopic scale. In the present work, we fabricated AlFe 2B 2/epoxy composites via magnetic field-assisted dynamic self-assembly of AlFe 2B 2-based powders, which exploits the magnetocrystalline anisotropy of the AlFe 2B 2 alloys. Crystallographic and microstructural characterizations reveal the formation of a strong 〈0 0 1〉 texture in the dynamically self-assembled AlFe 2B 2/epoxy composites. A large NTE coefficient of −10.8 × 10 -6/K was obtained over a broad temperature interval of 193.1 K from 120 K to 313.1 K. This study also highlights the great potential of textured AlFe 2B 2/epoxy composites as lightweight NTE materials.
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Research context
OpenAlex topics: Thermal Expansion and Ionic Conductivity · Layered Double Hydroxides Synthesis and Applications · Magnesium Oxide Properties and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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