摘要：微合金化是高性能鋁合金發展的重要方向，其相關機理研究是目前鋁合金領域關注的焦點。本文以Al-Cu合金作為模型材料，對比研究了微量元素Sc和Sn的微合金化作用，及其對材料強度、延性和斷裂行為的影響。研究結果表明，Sc在Al-Cu合金中的微合金化作用機理為Sc原子在Al2Cu析出相界面的偏聚，通過降低界面能抑制了析出相長大，大幅度提高了材料的強度，并在一定范圍內改善了材料的變形行為；Sn的微合金化作用機理為Sn顆粒誘發了Al2Cu析出相的異質形核，提高了形核密度，促進了析出相的彌散分布。通過微觀結構的觀察與統計，對材料的強韌化與變形斷裂行為進行了分析和討論。

　　關鍵詞：鋁合金；強韌化；變形斷裂；微合金化

Strengthening and deformation behaviors of microalloyed aluminum alloys

Gang Liu 1）， Jun Sun

State Key Laboratory for Mechanical Behaviors of Materials,Xi'an Jiaotong University, ShaanXi Xi'an 710049

　　Abstract:Microalloying is an important approach to develop high-performance aluminum alloys, and the microalloying mechanism is now extensively focused. In this paper, we study the microalloying effect of Sc and Sn on the strength, ductility, and fracture behaviors of Al-Cu alloy. Experimental results show that the addition of Sc significantly inhibit the precipitation growth and thus increase the strength of the Al-Cu alloy, for which the microalloying mechanism is Sc segregation at the precipitate/matrix interfaces. While the Sn microalloying mechanism is that the Sn particles promote the heterogeneous precipitation of Al2Cu strengthening phases, increase the precipitate density, and enhance the dispersion of precipitates. Strenthening/toughening and deformation/fracture behaviors have been systematically analyzed with respect to the microstructural evolution caused by the microalloying effect.

　　Key words:Aluminum alloys; Strengthening and toughening; Deformation behaviors; Microalloying

　　聯系方式

　　劉剛：lgsammer@mail.xjtu.edu.cn

責任編輯：趙澤南

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