(中南大学 材料科学与工程学院，长沙 410083)
摘 要: Al-Cu-Mg-Ag合金是在Al-Cu-Mg系合金基础上开发的新型合金。根据成分的不同，该合金的常见析出相有θ′、S′和Ω相，其中在基体{111}面析出的Ω相具有较高的沉淀硬化能力和热稳定性，使得Al-Cu-Mg-Ag成为一种新型中温高强铝合金。在简要介绍该合金研究过程的基础上，回顾该合金强化相的相组成、相的析出序列和热稳定性；同时总结以Ω相为主要强化相的合金体系合金化研究进展；并对该合金的研究方向进行展望。
关键字: Al-Cu-Mg-Ag合金；热稳定性；析出序列；Ω相；合金化
（School of Materials Science and Engineering, Central South University,Changsha 410083, China）
Abstract:Al-Cu-Mg-Ag alloys based on the Al-Cu-Mg system are promising materials for new generation supersonic passenger aircraft. The common precipitates include θ′, S′ and Ω precipitates. Ω precipitate forms as thin, finely dispersed hexagonal plates on the {111} slip planes of the matrix, and its morphology remains relatively stable at 200 ℃. The excellent Ω precipitate produces a new medium strength aluminum alloy of high temperatures for their improved creep resistance. The research progress of phase composition, precipitation process and alloying behavior of minor elements in Al-Cu-Mg-Ag alloys was reviewed.
Key words: Al-Cu-Mg-Ag alloys; thermal resistance; precipitation process; Ω precipitate; alloying behavior
