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Fe含量对2219铝合金锻件焊接组织与性能的影响
马云龙1,高艺航1,陈送义2,陈康华2,邢军2
1.北京宇航系统工程研究所,北京 100076;2.中南大学轻合金研究院,长沙 410083
摘要:
为研究杂质Fe元素对2219铝合金及其焊接接头的组织、性能以及电化学腐蚀性能等的影响,采用力学拉伸、焊接试验以及金相和扫描电镜等分析测试方法,对0.15%(w)至0.01%(w)等不同Fe元素含量的2219铝合金锻件进行实验研究和分析。研究表明:2219铝合金中经热变形加工存在网络状Al2Cu变成颗粒状和纤维状的Al7Cu2(Fe,Mn)相,随着Fe含量由0.15%(w)降低至0.01%(w),合金固溶时效后的Al7Cu2(Fe,Mn)相显著减少,锻件强度和塑性显著提高;合金焊接接头断口由脆性断裂逐渐转变为韧窝尺寸细小的韧性断裂,尤其对于延伸率,提高至近1.4倍,强度和塑性显著提高;合金的自腐蚀电流逐渐减小,单位面积上的线性极化电阻增大,合金焊接接头的耐腐蚀性能显著提高。
关键词:  2219铝合金  Fe含量  组织  性能
DOI:10.12044/j.issn.1007-2330.2020.04.015
分类号:TG 146.4
基金项目:国家自然科学基金委员会——中国航天科技集团公司航天先进制造技术研究联合基金资助项目(U1637601)
Effect of Fe Content on Welding Microstructure and Properties of 2219 Aluminum Alloy
MA Yunlong1, GAO Yihang1, CHEN Songyi2, CHEN Kanghua2, XING Jun2
1.Beijing Institute of Astronautical Systems Engineering,Beijing 100076;2.Light Alloy Research Institute,Central South University,Changsha 410083
Abstract:
In order to study the influence of Fe content on the microstructure,properties and electrochemical corrosion properties of 2219 aluminum alloy and its welded joints,mechanical tensile test,welding test, metallographic and scanning electron microscope were used to conduct experimental research and analysis on 2219 aluminum alloy forgings with different Fe contents from 0.15%(w) to 0.01%(w).The results show that there are Al7Cu2(Fe,Mn) phases in 2219 aluminum alloy which are transformed into granular and fibrous Al7Cu2(Fe,Mn) phase after thermal deformation processing.With the decrease of Fe content from 0.15%(w) to 0.01%(w),the Al7Cu2(Fe,Mn) phase after solid solution aging of the alloy is significantly reduced, and the strength and plasticity of the forging are significantly increased.The fracture of the alloy welded joint is transformed from brittle fracture to ductile fracture with small dimple size.The strength and plasticity are significantly increased,and elongation is increased to nearly 1.4 times especially.The corrosion current of the alloy decreases gradually and the linear polarization resistance per unit area increases,so the corrosion resistance of alloy welded joints is improved significantly.
Key words:  2219 aluminum alloy  Fe content  Microstructure  Properties