(西南铝业集团有限责任公司， 重庆 401326)
摘 要: 研究了Fe和Si杂质元素和Cu元素含量、 合金中氢含量和钠离子含量、 晶粒细化以及铸锭高温均匀化处理对7B04合金断裂韧性的影响。降低Fe和Si杂质元素及调整合金主要成分Cu含量， 可以减少难溶粗大硬相质点和过剩相； 降低合金氢含量和钠离子含量可以降低氢脆和钠脆; 加强晶粒细化可以获得细小晶粒组织； 进行高温均匀化处理促使粗大第二相质点溶入基体。 这些措施使合金获得高纯化、 高纯净化、高均匀化和非常细小的晶粒， 从而使合金的断裂韧性得到较大提高。
关键字: 7B04合金； 断裂韧性； 高纯化； 高纯净化； 高均匀化; 晶粒细化
（Southwest Aluminium Group Co. Ltd，Chongqing 401326， China）
Abstract:The effects of Fe and Si impurity elements and Cu content, the hydrogen and sodium ion content， grain refinement and high temperature homogenizing treatment on the fracture toughness of 7B04 alloy are studied. Lowering the contents of Fe and Si impurity elements and adjusting Cu content can reduce the coarse hard phases and the excess phases which are difficult to dissolve. Lowering the hydrogen and sodium ion content in the alloy can lower the hydrogen embrittlement and sodium embrittlement. Strengthening grain refinement can get fine grains. High temperature homogenizing treatment prompts the coarse second phase particle to dissolve into the matrix. The results show that high purity, high purification, high homogeneity and supper refined grains are obtained after these measures and the fracture toughness of alloy raises remarkably.
Key words: 7B04 alloy; fracture toughness; high purity; high purification; high homogeneity; grain refinement
