【摘要】：采用真空電子束焊接Al-Cu-Li合金,分析了焊態(tài)下接頭的微觀組織以及焊后熱處理對接頭微觀組織結(jié)構的影響。結(jié)果表明,在焊態(tài)下,焊縫中心為典型的樹枝晶,在樹枝晶界分布著共晶組織,其主要組成相為α+θ′(Al2Cu),焊縫中的強化相數(shù)量較少。經(jīng)過焊后熱處理,接頭焊縫區(qū)組織發(fā)生了顯著變化,焊縫中心組織由樹枝晶轉(zhuǎn)變?yōu)榈容S晶,焊態(tài)下的晶界偏析現(xiàn)象得以消除,焊縫中析出了數(shù)量較多的球狀δ′(Al3Li)相以及細針狀T1(Al2CuLi)相,使接頭的力學性能明顯改善,接頭抗拉強度由焊態(tài)下的348 MPa提高到熱處理后的423 MPa,接頭拉伸斷口呈韌性斷裂特征。
[Abstract]:The microstructure of the welded joint and the effect of post-weld heat treatment on the microstructure of the joint were analyzed by vacuum electron beam welding (Al-Cu-Li) alloy. The results show that in the welding state, the center of the weld is a typical dendrite, and the eutectic structure is distributed at the dendritic boundary. The main phase is 偽 胃'(Al2Cu), and the number of strengthening phases in the weld is less. After post-welding heat treatment, the microstructure of the weld zone of the joint changed significantly, the central structure of the weld changed from dendrite to equiaxed crystal, and the segregation phenomenon of grain boundary was eliminated in the welding state. A large number of spherical 未'(Al3Li) phases and fine needle T1 (Al2CuLi) phases were precipitated in the weld. The mechanical properties of the joints were improved obviously. The tensile strength of the joints increased from 348 MPa under welding to 423 MPa, joints after heat treatment.
【作者單位】： 南京航空航天大學材料科學與技術學院;
【基金】：航空科學基金(2015ZE52048)資助項目 江蘇高校優(yōu)勢學科建設工程資助項目
【分類號】：TG456.3

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本文編號：2256416