Mechanism analysis of metalloid elements affecting amorphous forming ability and magnetic properties of Co-Y-B alloy

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Abstract

Co-based metallic glass (MG) is a new class of soft magnetic material and has promising applications in high-frequency fields due to its high magnetic permeability and low coercivity. However, this kind of MG has poor glass-formation ability (GFA) and relatively low saturated magnetic flux density, so its application scope is limited. The atomic size of metalloid element M (B, C, Si, and P) is small, which can easily enter into the gap between atoms, and there is a relatively large negative enthalpy of mixing between metalloid element and metal element. Therefore, alloying with metalloid element M is an effective method to improve the GFA while maintaining superior soft magnetic properties for Co-based MG. In this work, the formation process of Co ₇₂Y ₃B ₁₅M ₁₀MG is simulated by ab initiomolecular dynamics (AIMD) method, and the effects of the addition of metalloid elements C, Si, P on the GFA and magnetic properties of Co-Y-B MGs are investigated. It is devoted to analyzing the relationship between local atomic structure and property at an atomic level. According to the results of the characterization parameters of local atomic structure (pair distribution function, coordination numbers, chemical short-range order, Voronoi polyhedron index, local five-fold symmetry, and mean square displacement), it is found that the GFA of the four alloys is different due to their different local atomic structures. Both Co ₇₂Y ₃B ₁₅C ₁₀alloy and Co ₇₂Y ₃B ₁₅P ₁₀alloy possess a higher fraction of prism structure, weaker solute segregation between B/C-C and B/P-P atoms, higher atomic diffusivity in the supercooled state (1100 K), and hence weakening the GFA of the alloys. The Co ₇₂Y ₃B ₁₅Si ₁₀alloy has a higher fraction of icosahedral-like structure, stronger attraction between Co-Si atoms and the solute segregation between B/Si-Si atoms, lower atomic diffusivity in the supercooled state, thereby increasing the GFA. Therefore, the addition of Si is beneficial for enhancing the GFA, while the addition of C or P will reduce the GFA, that is, the GFA of the four alloys decreases in the order of Co ₇₂Y ₃B ₁₅Si ₁₀> Co ₇₂Y ₃B ₂₅> Co ₇₂Y ₃B ₁₅P ₁₀> Co ₇₂Y ₃B ₁₅C ₁₀. In terms of magnetic properties, with the addition of C, Si, P elements, the total magnetic moment of Co ₇₂Y ₃B ₁₅M ₁₀(M = B, C, Si, P) alloy decreases in the following order: Co ₇₂Y ₃B ₂₅> Co ₇₂Y ₃B ₁₅Si ₁₀> Co ₇₂Y ₃B ₁₅C ₁₀> Co ₇₂Y ₃B ₁₅P ₁₀. The stronger p-d orbital hybridization between Co-Si atoms enhances the ferromagnetic exchange interaction, leading the total magnetic moment to be less affected by Si addition.

Keywords:

Co-based metallic glasses/
ab initio molecular dynamics simulations/
glass-forming ability/
magnetic property

Authors and contacts

Corresponding author:Zhang Wei,wzhang@dlut.edu.cn; Yao Man,yaoman@dlut.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant No. 51871039).

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Alloys	μ_total	μ_Co	μ_Y	μ_B	μ_C	μ_Si	μ_P
Co₇₂Y₃B₂₅	75.179	1.086	–0.133	–0.063	—	—	—
Co₇₂Y₃B₁₅C₁₀	69.645	1.005	–0.097	–0.067	–0.042	—	—
Co₇₂Y₃B₁₅Si₁₀	72.722	1.053	–0.140	–0.059	—	–0.037	—
Co₇₂Y₃B₁₅P₁₀	68.969	0.977	–0.097	–0.057	—	—	–0.023

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Vol. 71, Issue 22 - 2022-11-20

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