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2195铝锂合金摩擦搅拌焊接头组织与腐蚀行为

马云龙, 杨子奇, 李劲风

马云龙, 杨子奇, 李劲风. 2195铝锂合金摩擦搅拌焊接头组织与腐蚀行为[J]. 焊接学报, 2019, 40(10): 142-147. DOI: 10.12073/j.hjxb.2019400276
引用本文: 马云龙, 杨子奇, 李劲风. 2195铝锂合金摩擦搅拌焊接头组织与腐蚀行为[J]. 焊接学报, 2019, 40(10): 142-147. DOI: 10.12073/j.hjxb.2019400276
MA Yunlong, YANG Ziqi, LI Jinfeng. Structure and corrosion behavior of friction stir weld joint of 2195 Al-Li alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(10): 142-147. DOI: 10.12073/j.hjxb.2019400276
Citation: MA Yunlong, YANG Ziqi, LI Jinfeng. Structure and corrosion behavior of friction stir weld joint of 2195 Al-Li alloy[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(10): 142-147. DOI: 10.12073/j.hjxb.2019400276

2195铝锂合金摩擦搅拌焊接头组织与腐蚀行为

详细信息
    作者简介:

    马云龙,男,1983年出生,高级工程师,博士研究生. 主要从事运载火箭及航天飞行器结构技术、航天新材料及制造技术应用、结构系统设计等研究工作. Email:i56567@sina.com

    通讯作者:

    李劲风,男,教授. Email:lijinfeng@csu.edu.cn

Structure and corrosion behavior of friction stir weld joint of 2195 Al-Li alloy

  • 摘要: 研究了5 mm厚度2195-T8铝锂合金板材摩擦搅拌焊(FSW)接头不同位置的显微组织、腐蚀电化学行为以及在晶间腐蚀介质中的腐蚀特征. 结果表明,母材为纤维状晶粒组织,而焊核区为晶粒尺寸小于10 μm的完全再结晶组织. 2195-T8铝锂合金母材时效强化相为T1相(Al2CuLi)和θ'相(Al2Cu),热力影响区大部分T1相和全部θ'相已重新溶解至基体中,而焊核区所有T1相和θ'相均重新溶解. 从母材至焊核区,电位逐渐增加,相应地FSW接头上表面发生宏观平面电偶腐蚀,焊核区承担阴极电流,而母材部分则承担阳极电流. 在晶间腐蚀介质中,焊核区表面发生程度较轻的均匀腐蚀,母材部分发生深入基体内部的腐蚀.
    Abstract: Microstructures, electrochemical behavior and corrosion feature of different locations in 2195-T8 Al-Li alloy FSW joint were investigated. The parent metal possesses fiber-like grains, but the nugget zone is featured with fully recrystallized grains with size less than 10 μm. The strengthening precipitates of the parent metal are T1 (Al2CuLi) and θ' (Al2Cu). In the thermo-mechanically affected zone, most T1 and all θ' are re-dissolved, but all T1 and θ' are re-dissolved in the nugget zone. From the parent metal to the nugget zone, the potential increases. Accordingly, galvanic corrosion occurs on the FSW joint surface, the parent metal undertakes anodic current and the nugget zone undertakes cathodic current. In the intergranular corrosion medium, superficial corrosion occurs on the nugget zone surface, but corrosion penetrates inside the parent metal.
  • 图  1   平面电偶腐蚀组合测试示意图(mm)

    Figure  1.   Schematic diagram for coupling test

    图  2   FSW接头金相显微组织形貌

    Figure  2.   Metallographic images of the FSW joint

    图  3   母材SAED谱及TEM暗场像形貌

    Figure  3.   SAED patterns and TEM DF images of the parent metal

    图  4   热力影响区TEM明场像形貌

    Figure  4.   TEM BF images of the TMAZ

    图  5   焊核区TEM明场像形貌及第二相能谱分析

    Figure  5.   TEM BF images of the NZ and EDS ananlysis of secondary particles

    图  6   FSW接头不同位置在3.5% NaCl溶液中电化学曲线

    Figure  6.   Electrochemical curves of different locations in the FSW joint

    图  7   FSW接头不同位置偶合电流曲线

    Figure  7.   Coupling current of different locations in the FSW joint

    图  8   FSW接头不同位置在IGC溶液中腐蚀后截面金相形貌

    Figure  8.   Sectional corrosion morphologies at different locations in the FSW joint

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出版历程
  • 收稿日期:  2018-04-03
  • 网络出版日期:  2020-07-12
  • 刊出日期:  2019-09-30

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