摘要
目的解决TiNi/TC4异种金属的焊接问题,扩大此2种金属的结合应用。方法选用3 mm×40 mm×0.5 mm的FeCoCrNiMn高熵合金薄片作为中间层,采用电子束焊接方法焊接TiNi/TC4。对形成的接头进行宏观分析,采用电子显微镜以及X射线衍射仪对其微观组织进行表征;通过拉伸和硬度测试,分析该接头的力学性能。结果接头宏观成形存在裂纹缺陷,观察微观组织发现,在焊接接头中只形成了AlTi_(3)相和Ni_(0.35)Al_(0.30)Ti_(0.35)相,没有形成Ti_(2)Ni相。接头的抗拉强度为81.8 MPa,伸长率为4.38%,平均显微硬度为HV661,断口呈脆性断裂特征。结论将高熵合金作为中间层焊接TiNi/TC4是一种有效的方法,可以成功实现异种金属的焊接,中间层的存在可以有效调控焊缝中的析出相种类。
The work aims to solve the welding problem of TiNi/TC4 dissimilar metals and expand the combined use of these two metals.A 3 mm×40 mm×0.5 mm FeCoCrNiMn high-entropy alloy(HEA)sheet was selected as the interlayer,and TiNi/TC4 dissimilar metals were welded by electron beam welding.The macroscopic analysis of the formed joint was carried out,and the microstructure of the joint was characterized by a scanning electron microscope and an X-ray diffraction.The mechanical properties of the joint were analyzed through tensile and hardness tests.The joint was macroscopically formed with cracking defects and the microstructure showed that only AlTi_(3) and Ni_(0.35)Al_(0.30)Ti_(0.35) were formed in the welded joint,and no Ti_(2)Ni phase was formed.The tensile strength of the joint was 81.8 MPa,the elongation was 4.38%,the average microhardness was HV661,and the fracture was characterized by brittle fracture.Welding TiNi/TC4 with high-entropy alloy as the interlayer is an effective method,which can successfully realize the welding of dissimilar metals.The existence of the interlayer can effectively control the phase formed in the weld.
作者
孟凡刚
王严
谢吉林
陈玉华
MENG Fan-gang;WANG Yan;XIE Ji-lin;CHEN Yu-hua(Natural Resources and Planning Bureau of Anqiu City,Weifang 262100,China;Jiangxi Key Laboratory of Forming and Joining Technology for Aerospace Components,Nanchang Hangkong University,Nanchang 330036,China;State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150080,China)
出处
《精密成形工程》
北大核心
2021年第6期130-137,共8页
Journal of Netshape Forming Engineering
基金
国家自然科学基金(No.51865035)
先进焊接与连接国家重点实验室开放基金(AWJ-22M11)。
关键词
异种金属
高熵合金
电子束焊接
金属间化合物
dissimilar metals
high-entropy alloy
electron beam welding
intermetallic compounds
