Fe添加方式对8021铝合金铸锭组织性能的影响  

Effect of Fe addition method on microstructure and properties of 8021 aluminum alloy ingot

作　　者：吕娟 吴楠 娄洁 文静熊 LV Juan;WU Nan;LOU Jie;WEN Jingxiong(Yunnan College of Business Management,Kunming 650106,China)

机构地区：[1]云南经济管理学院,云南昆明650106

出　　处：《轻合金加工技术》2023年第2期23-26,共4页Light Alloy Fabrication Technology

摘　　要：采用铁剂和Al-Fe中间合金两种方式添加Fe元素制备了生产药品包装铝箔用的8021铝合金铸锭,采用高分辨率扫描电镜(SEM)、X射线能谱(EDS)和元素面分布技术(EDS-Mapping),研究了铸锭中合金元素的分布和第二相粒子的微观形貌及分布特征.结果表明,在8021铝合金铸锭中Fe元素主要偏聚于晶界处.其中使用铁剂所生产的铸锭,Fe元素在晶界处含量远高于在基体中的含量;使用Al-Fe中间合金生产的铸锭,Fe元素在晶界与基体中的含量差异较小,分布更为均衡.Fe元素熔点高,较低的合金化温度导致Fe元素无法充分扩散溶解至基体内,因此在晶界富集.在晶界析出的针状第二相降低了合金铸锭的加工性能.采用Al-Fe中间合金生产铸锭,不仅可以降低Fe元素的损耗,同时能提升铝合金铸锭的力学性能.The 8021 aluminum alloy ingot used for the production of pharmaceutical packaging aluminum alloy foil was prepared by adding Fe in two ways,in the form of iron additive and Al-Fe master alloy respectively.The distribution of solute elements in aluminum alloy ingot was studied and the micromorphology and distribution characteristics of the second phase particles were observed with high-resolution scanning electron microscope(SEM),Xray energy spectrum(EDS)and element surface distribution technology(EDS mapping).The results show that Fe is mainly segregated at the grain boundary in 8021 aluminum alloy ingot.Among the samples produced with iron additive,the content of Fe at the grain boundary is much higher than that of the matrix.In the samples produced with Al-Fe master alloy,the difference of Fe element content between grain boundary and matrix is smaller and the distribution is more balanced.The melting point of Fe element is high,which leads to the failure of Fe element to fully diffuse and solute into the matrix with a low alloying temperature,and a large amount of Fe element is enriched at the grain boundary.The acicular second phase precipitated at the grain boundary reduces the processing performance of aluminum foil ingot.By using Al-Fe master alloy for alloying production can not only reduce the loss of Fe elements,but also improve aluminum alloy ingot mechanical properties.

关 键 词：Fe元素分布 药品用包装 8021铝合金铸锭 合金化 组织性能 

分 类 号：TG292[金属学及工艺—铸造]