Iron can cause negative effects on the recycling and mechanical performance of Al–Si alloys, because it is difficult to remove, and easy to form Fe‐rich intermetallic with large size. In this regard, travelling magnetic fields are performed to optimize Fe‐rich intermetallic in Al–12 wt% Si–2 wt% Fe alloys; and experiments and simulations are conducted to study the related evolutions induced by different Fe content from 0.1 to 2 wt% and by travelling magnetic fields. Current findings conclude that the increase of Fe content changes the precipitation sequence, causing Fe‐rich intermetallic to preferentially form and convert from α‐Al₈Fe₂Si to β‐Al₉Fe₂Si₂; accompanied by the increase of aspect ratio and max‐length from 1.81 and 15.0 μm ( wt% Fe) to 50.2 and 578.2 μm (2 wt% Fe) respectively, as well as the decrease of curvature from 0.079 μm⁻¹ (0.1 wt% Fe) to 0.001 μm⁻¹ (2 wt% Fe). Moreover, precipitates containing Cu shift from adhering to the (Al, Si) phases to Fe‐rich intermetallic. In additionally, primary Si particles and Al–Si eutectic phases decrease. Noteworthily, travelling magnetic fields can reduce nucleate radius and generate intense long‐range directional melt flows, further to distribute temperature and solute uniformly and break up Fe‐rich intermetallic, so as to optimize them. Consequently, max‐length and aspect ratio decrease by 43.7% and 44.6%, whereas curvature increases by 2.7 times.

中文翻译：

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通过添加行进磁场优化Al-12 wt％Si–2 wt％Fe合金中富铁金属间化合物的微观结构优化

铁可能难以去除并且容易形成大尺寸的富铁金属间化合物，会对铝硅合金的循环利用和机械性能造成负面影响。在这方面，通过行进磁场来优化Al-12 wt％Si-2 wt％Fe合金中的富铁金属间化合物。并进行了实验和模拟研究，研究了不同含量的铁（0.1％至2％）和行进磁场引起的相关演化。当前的发现得出结论，铁含量的增加改变了沉淀顺序，导致富铁金属间化合物优先形成并从α‐ Al ₈ Fe ₂ Si转变为β‐ Al ₉ Fe ₂ Si _2。; 伴随着长宽比和最大长度从1.81和15.0μm（wt％Fe）分别增加到50.2和578.2μm（2 wt％Fe）以及曲率从0.079μm ^-1（0.1 wt％ （Fe）至0.001μm ^-1（2 wt％Fe）。此外，含铜的沉淀物从附着相转移到（Al，Si）相，转变成富铁金属间化合物。另外，原始的Si颗粒和Al-Si共晶相减少。值得注意的是，行进的磁场可以减小成核半径，并产生强烈的远程定向熔体流动，进一步均匀地分布温度和溶质，并破坏富铁金属间化合物，从而对其进行优化。因此，最大长度和长宽比分别减少了43.7％和44.6％，而曲率增加了2.7倍。