發(fā)布時(shí)間：2018-10-08 10:21

【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(duì)接頭微觀組織結(jié)構(gòu)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(qiáng)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(xì)針狀T1(Al2CuLi)相,使接頭的力學(xué)性能明顯改善,接頭抗拉強(qiáng)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(xué)材料科學(xué)與技術(shù)學(xué)院;
【基金】：航空科學(xué)基金(2015ZE52048)資助項(xiàng)目 江蘇高校優(yōu)勢學(xué)科建設(shè)工程資助項(xiàng)目
【分類號(hào)】：TG456.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前4條

1 李小飛;李曉紅;熊華平;李艷;郭紹慶;張學(xué)軍;;鋁鋰合金的焊縫組織與開裂敏感性研究[J];航空材料學(xué)報(bào);2007年03期

2 黃蘭萍,鄭子樵;微量Ag、Mg在2197合金中的合金化作用[J];金屬熱處理;2005年04期

3 李世晨,鄭子樵,劉祖耀,李劍,楊培勇,殷順高;Al-Cu-Li-xMg合金時(shí)效初期微結(jié)構(gòu)演變的Monte Carlo模擬[J];中國有色金屬學(xué)報(bào);2005年09期

4 袁志山;陸政;謝優(yōu)華;戴圣龍;劉常升;;時(shí)效制度對(duì)2A97鋁鋰合金組織和性能的影響[J];中國有色金屬學(xué)報(bào);2006年12期

【共引文獻(xiàn)】

相關(guān)期刊論文 前10條

1 宋e，

本文編號(hào)：2256416