2Si相的一部分Si元素會被過多的Ce、La元素?fù)寠Z而導(dǎo)致強(qiáng)化相減少，另一方面，較多數(shù)量或較大尺寸的稀土相容易成為裂紋源，不利于合金組織的改善和性能的提升。富鈰稀土與Al-Ti-B復(fù)合添加的形式能夠在保證合金強(qiáng)度的同時(shí)顯著提升6061鑄態(tài)合金的塑性。采用復(fù)合添加比例為Al-Ti-B:RE=2:1時(shí)，制備得到的新型6061-RE鋁合金在鑄態(tài)狀態(tài)下和經(jīng)過均勻化熱處理后，平均延伸率相較原始6061鋁合金分別增長了50%與45%，這有利于合金后續(xù)的變形加工。采用復(fù)合添加比例為Al-Ti-B:RE=2:1時(shí)，制備得到的該6061-RE鋁合金經(jīng)540 ℃/1 h固溶與180 ℃/5 h時(shí)效熱處理后，析出大量針狀 Mg-Si相，其平均極限抗拉伸強(qiáng)度與屈服強(qiáng)度分別達(dá)313.2與283.1 MPa，相較原始6061鋁合金分別提升了12.3%與14.5%，平均延伸率提升了41%。;Modification of 6061 aluminum alloy was conducted through composite addition of cerium-rich rare earths and Al-Ti-B. Results show that the composite addition of Al-Ti-B and Ce/La element at a specific ratio notably promotes the refinement of the alloy's grains. Ce and La elements are combined with Si and other elements to form rare earth phases, improving the morphology and distribution of precipitates and mitigating the adverse effects of β-Fe phases on the microstructure and mechanical properties of alloy. However, excessive rare earth content poses challenges; it not only leads to a decrease in Mg-Si strengthening phase by binding with Si but also promotes the formation of larger or numerous rare earth phases that may act as initiation points for cracks, thereby impeding the improvement of the structure and performance of alloy. The composite addition of cerium-rich rare earths and Al-Ti-B not only preserves the strength of the alloy but also significantly enhances the plasticity of the 6061 as-cast alloy. At a composite addition ratio of Al-Ti-B:RE=2:1, the newly developed 6061-RE aluminum alloy exhibits increased average elongation by 50% and 45% in its as-cast and homogenized states, respectively, compared to the baseline 6061 alloy, facilitating subsequent deformation processing. After solution treatment at 540 °C for 1 h and aging at 180 °C for 5 h, the average ultimate tensile strength and yield strength of 6061-RE alloys reach 313.2 and 283.1 MPa, increased by 12.3% and 14.5% compared with those of the original alloy, respectively, and the average elongation is improved by 41%."/>