As Fe impurity in recycled Al–Si–Cu alloys always form Fe-rich intermetallics which is detrimental to the mechanical properties, many studies have been searching for the effective neutralizing elements for transforming the brittle β-AlFeSi intermetallics into less harmful α-AlFeSi. In this study, three transition metals (Co, Mn, and Cr) have been studied systemically by comparing not only their percentage in 3D using X-ray computed tomography but also the elemental mapping using scanning electron microscopy equipped with energy dispersive spectrometer. It was found that the morphology and the amount transformation from β-AlFeSi to other phases largely depends on the neutralizing element additions. The addition of Co forms a high melting point intermetallic compound, Al₇CoCu₂, and adsorbs a large amount of Fe elements to form Al₇(FeCo)Cu₂ increasing plate-like intermetallics, leading to a decrease in mechanical properties from 385.7 MPa to 309.6 MPa. The addition of Mn reduces the size of Fe-rich phase and transform structure of Fe-rich phase from β to α, leading to the improvement of mechanical properties from 385.7 to 427.9 MPa. The addition of Cr forms the Al₁₃Cr₄ compound and absorb Fe atoms to reduce the β-AlFeSi by forming the Al₇(FeCr) compound. However, its effect is much lower than that of the Mn element, improving the mechanical properties by only 3.1%.

由于回收的 Al-Si-Cu 合金中的 Fe 杂质总是形成富铁金属间化合物，这对机械性能有害，许多研究一直在寻找有效的中和元素，以将脆性 β-AlFeSi 金属间化合物转化为危害较小的 α-AlFeSi。在这项研究中，系统研究了三种过渡金属（Co、Mn 和 Cr），不仅使用 X 射线计算机断层扫描比较它们在 3D 中的百分比，而且使用配备能量色散光谱仪的扫描电子显微镜进行元素映射。发现从β-AlFeSi向其他相的形态和转变量很大程度上取决于中和元素的添加。添加Co形成高熔点金属间化合物Al ₇ CoCu ₂, 并吸附大量 Fe 元素形成 Al ₇ (FeCo)Cu ₂增加的片状金属间化合物, 导致力学性能从 385.7 MPa 下降到 309.6 MPa。Mn的添加减小了富铁相的尺寸，并使富铁相的结构从β转变为α，导致力学性能从385.7 MPa提高到427.9 MPa。Cr的添加形成Al ₁₃ Cr ₄化合物并吸收Fe原子以通过形成Al ₇ (FeCr)化合物来还原β-AlFeSi。但其效果远低于Mn元素，仅提高机械性能3.1%。