(湖南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410082)
摘 要: AlMgSi(Cu)合金是應(yīng)用最廣泛的可熱處理強(qiáng)化鋁合金，該類合金的主要性能與時效階段析出的硬化相緊密相關(guān)。綜述AlMgSi(Cu)合金在不同熱處理階段形成的納米析出相的形貌、結(jié)構(gòu)和穩(wěn)定性。提出了動態(tài)結(jié)構(gòu)的概念和模型，并以此揭示了納米析出相結(jié)構(gòu)演變規(guī)律及其與力學(xué)性能間的關(guān)系。在含銅 6×××系鋁合金的納米析出相結(jié)構(gòu)演變研究領(lǐng)域有若干未解決的基本問題，而這些問題的解決對高中強(qiáng)度6×××系鋁合金的開發(fā)具有重要的指導(dǎo)意義。
關(guān)鍵字: 鋁合金；析出相；熱處理; 人工時效；微觀結(jié)構(gòu)
（College of Materials Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:The performances of AlMgSi(Cu) alloys widely used in the industry, largely correlate with the precipitates formed in the thermal process. The morphologies, the structural features and the phase stabilities of all well-known precipitates that possibly form in the AlMgSi(Cu) alloys were reviewed. In order to understand the structural transformations between the early-stage hardening precipitates in the alloys, and their relations with the mechanical properties of the materials, a concept of dynamic structure to describe the evolution of the hardening particles was introduced. For further development of the high-strength 6××× series alloys, a few un-answered questions about the structural transformations in Cu-containing 6××× series alloys are crucial.
Key words: aluminum alloy; precipitate; heat treatment; artificial aging; microstructure
