Abstract Al-20wt.%Si hypereutectic alloys were designed in order to study how a high static magnetic field (HSMF) during annealing affected the microstructure evolution, atomic diffusion, and resultant mechanical properties from the microscale to the atomic scale. Our results indicate that the size of the primary silicon particles (PSPs) increased with increasing temperature, while it decreased with increasing magnetic flux density (MFD). The solid solubilities of the Al matrix were 0.84 wt% and 0.53 wt% for the ribbons annealed at 0 T and 8 T, respectively. HSMF decreased the precipitation rate of Al from the PSPs and retained the solute trapping effect in the PSPs during annealing. After annealing the ribbon, the Al matrix retained the lattice distortions under the HSMF. Applying a HSMF led to the coexistence of grain boundary strengthening, particle strengthening, dislocation strengthening, and solid solution strengthening, so the hardness and elastic modulus increased with increasing MFD. Compared with the ribbon annealed at 8 T, the ribbon annealed at 0 T had a hardness and elastic modulus improved by 139.47% and 1053.2%, respectively. This paper presents a new way to design heat treatments and even solidification processes for metallic materials by controlling their diffusion by applying an HSMF.

中文翻译：

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高静磁场下退火的 Al-20wt.%Si 薄带的扩散控制机械性能增强，从微米尺度到原子尺度

摘要 设计Al-20wt.%Si过共晶合金是为了研究退火过程中的高静磁场（HSMF）如何影响微观组织演变、原子扩散以及由此产生的从微观到原子尺度的机械性能。我们的结果表明，初级硅颗粒 (PSP) 的尺寸随着温度的升高而增加，而随着磁通量密度 (MFD) 的增加而减小。对于在 0 T 和 8 T 下退火的带材，Al 基体的固溶度分别为 0.84 wt% 和 0.53 wt%。HSMF 降低了 PSP 中铝的析出率，并在退火过程中保留了 PSP 中的溶质捕获效应。带材退火后，铝基体在 HSMF 下保留了晶格畸变。应用 HSMF 导致晶界强化的共存，颗粒强化、位错强化和固溶强化，因此硬度和弹性模量随着 MFD 的增加而增加。与8T退火带相比，0T退火带的硬度和弹性模量分别提高了139.47%和1053.2%。本文提出了一种通过应用 HSMF 控制金属材料的扩散来设计金属材料热处理甚至凝固过程的新方法。