Al-5Ti-1B/Al-10Ce复合添加对再生铝富铁相的变质作用

Modification Effect of Combined Al-5Ti-1B and Al-10Ce Additions on Iron-Rich Phases in Recycled Aluminum

摘要: 本文以A356.2合金和Al-10Fe中间合金为原料，采用复合添加Al-5Ti-1B和Al-10Ce的方法对再生铝进行细化变质处理。通过金相显微镜、X射线衍射仪、扫描电镜结合拉伸、硬度等力学实验，研究了Al-10Ce不同添加量对再生铝金相组织及力学性能的影响规律。结果表明：当Al-5Ti-1B添加量为0.65 wt%、Al-10Ce添加量为0.5 wt%时，富铁相晶粒尺寸减小53.87%，合金综合力学性能达到最优，其硬度为54.11 kgf/mm²，抗拉强度为167 MPa，伸长率为5.57%。研究证实复合添加Al-5Ti-1B和Al-10Ce能有效细化变质富铁相，但过量Al-10Ce会降低细化效果，该工艺参数为再生铝降铁处理提供了重要工艺参考。

Abstract: This study utilized A356.2 alloy and Al-10Fe master alloy as raw materials, employing a composite addition of Al-5Ti-1B and Al-10Ce to refine and modify recycled aluminum. Metallographic microscopy, X-ray diffractometry (XRD), and scanning electron microscopy (SEM) coupled with tensile and hardness tests were systematically employed to investigate the influence of varying Al-10Ce additions on the microstructure and mechanical properties of recycled aluminum. The results indicated that when Al-5Ti-1B and Al-10Ce were added at 0.65 wt% and 0.5 wt%, respectively, the grain size of iron-rich phases was reduced by 53.87%, achieving optimal comprehensive mechanical properties. The alloy exhibited a hardness of 54.11 kgf/mm², an ultimate tensile strength (UTS) of 167 MPa, and an elongation of 5.57%. The findings demonstrated that the synergistic addition of Al-5Ti-1B and Al-10Ce effectively refined and modified iron-rich phases; however, excessive Al-10Ce additions diminished the refining efficiency. This optimized process parameter provides critical guidance for iron reduction in recycled aluminum alloys.