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Uncovering the effects of neutralizing elements (Co, Mn and Cr) on the Fe-rich intermetallic formation in Al–Si–Cu alloys
Materials Science and Engineering: A ( IF 6.1 ) Pub Date : 2022-09-27 , DOI: 10.1016/j.msea.2022.144090
Bing Wang , Junsheng Wang , Xinxiu Liu , Quan Li , Xiaoguang Liu

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%.



中文翻译:

揭示中和元素(Co、Mn 和 Cr)对 Al-Si-Cu 合金中富铁金属间化合物形成的影响

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%。

更新日期:2022-09-27
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