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Improvement of Microstructure and Mechanical Properties of Near‐Eutectic Al–Mg2Si Alloys by Eu Addition
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2021-01-12 , DOI: 10.1002/adem.202001447 Yinling Jin 1 , Hongze Fang 1 , Shu Wang 1 , Ruirun Chen 1, 2 , Yanqing Su 1, 2 , Jingjie Guo 1, 2
Advanced Engineering Materials ( IF 3.4 ) Pub Date : 2021-01-12 , DOI: 10.1002/adem.202001447 Yinling Jin 1 , Hongze Fang 1 , Shu Wang 1 , Ruirun Chen 1, 2 , Yanqing Su 1, 2 , Jingjie Guo 1, 2
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To modify the microstructure and improve the tensile properties of Al–Mg2Si alloys, different contents of Eu are added into near‐eutectic Al–Mg2Si alloys by melting. Results show that the near‐eutectic Al–Mg2Si alloys consist of primary α‐Al, the first eutectic and second eutectic (Al + Mg2Si) phases, and a few Fe‐containing phase. When the addition of Eu reaches 0.05%, the first eutectic structure is refined, and the first eutectic Mg2Si phase transforms from platelet into fiber. Meanwhile, the second eutectic phase increases, even that the alloy is almost the second eutectic phase when the Eu content is 0.3%. These changes are induced by the modification of Eu. Tensile testing shows that the ductility and the strength are improved to 8.6% and 178 MPa from 1% and 145 MPa when the Eu content is 0.05%, and fracture mode is also changed. This improvement is caused by the modification of the eutectic structure. The tensile properties are decreased or even deteriorated with further increasing the Eu content, which is induced by over‐modification of Eu addition. It is concluded that the modification of eutectic Mg2Si phase by Eu addition contributes to the enhancement of mechanical properties of the near‐eutectic Al–Mg2Si alloys.
中文翻译：
Eu添加改善近共晶Al-Mg2Si合金的组织和力学性能
为了改变Al-Mg 2 Si合金的微观结构并改善其拉伸性能，通过熔化将不同含量的Eu添加到近共晶Al-Mg 2 Si合金中。结果表明，近共晶的Al-Mg 2 Si合金由初生α-Al，第一共晶和第二共晶（Al + Mg 2 Si）相以及一些含Fe相组成。当Eu的添加量达到0.05％时，第一共晶组织被细化，并且第一共晶Mg 2Si相从血小板转变为纤维。同时，当Eu含量为0.3％时，即使合金几乎是第二共晶相，第二共晶相也增加。这些变化是由Eu的修饰引起的。拉伸试验表明，当Eu含量为0.05％时，塑性和强度从1％和145 MPa分别提高到8.6％和178 MPa，并且断裂模式也发生了变化。这种改进是由于共晶结构的改变而引起的。随着Eu含量的进一步增加，拉伸性能会降低甚至降低，这是由于Eu添加量的过度改性引起的。结论是，通过添加Eu对Mg 2 Si共晶相的改性有助于提高近共晶Al–Mg 2的力学性能。硅合金。
更新日期：2021-01-12
中文翻译：
Eu添加改善近共晶Al-Mg2Si合金的组织和力学性能
为了改变Al-Mg 2 Si合金的微观结构并改善其拉伸性能，通过熔化将不同含量的Eu添加到近共晶Al-Mg 2 Si合金中。结果表明，近共晶的Al-Mg 2 Si合金由初生α-Al，第一共晶和第二共晶（Al + Mg 2 Si）相以及一些含Fe相组成。当Eu的添加量达到0.05％时，第一共晶组织被细化，并且第一共晶Mg 2Si相从血小板转变为纤维。同时，当Eu含量为0.3％时，即使合金几乎是第二共晶相，第二共晶相也增加。这些变化是由Eu的修饰引起的。拉伸试验表明，当Eu含量为0.05％时，塑性和强度从1％和145 MPa分别提高到8.6％和178 MPa，并且断裂模式也发生了变化。这种改进是由于共晶结构的改变而引起的。随着Eu含量的进一步增加，拉伸性能会降低甚至降低，这是由于Eu添加量的过度改性引起的。结论是，通过添加Eu对Mg 2 Si共晶相的改性有助于提高近共晶Al–Mg 2的力学性能。硅合金。
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