焊接温度对AZ91/TC4扩散焊接接头组织和性能的影响  

Effect of welding temperature on microstructure and properties of AZ91/TC4 diffusion welded joints

作　　者：何子涛 黄本生[1,2,3] 黄思语 刘罗林 HE Zi-tao;HUANG Ben-sheng;HUANG Si-yu;LIU Luo-lin(School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China;Energy Equipment Institute,Southwest Petroleum University,Chengdu 610500,China;Sichuan Engineering Technology Research Center of Basalt Fiber Composites Development and Application,Southwest Petroleum University,Chengdu 610500,China;Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]西南石油大学新能源与材料学院,四川成都610500 [2]西南石油大学能源装备研究院,四川成都610500 [3]四川省玄武岩纤维复合材料及开发应用工程技术研究中心,四川成都610500 [4]中国核动力研究设计院核反应堆系统设计重点实验室,四川成都610213

出　　处：《材料热处理学报》2023年第6期191-198,共8页Transactions of Materials and Heat Treatment

基　　金：四川省科技厅区域创新合作项目(23QYCX0060)。

摘　　要：以Al箔为中间层,在不同工艺参数下对AZ91镁合金与TC4钛合金进行了瞬间液相扩散焊接试验。通过扫描电镜(SEM)、能谱仪(EDS)和X射线衍射(XRD)对接头的微观形貌、元素扩散及物相组成进行分析。采用显微硬度计及剪切试验测试了接头的力学性能,并提出了接头界面形成过程的理想模型。结果表明:在保温20 min,压力1 MPa的条件下,在480~510℃的焊接温度范围内可以实现镁合金与钛合金的扩散连接;随着焊接温度的升高,焊接界面的元素扩散加快,反应逐渐充分,生成了Al_(12)Mg_(17)和Al_(3)Ti相,接头的性能呈先增加后减小的趋势;当焊接温度为500℃时,接头的抗剪切强度和硬度达到最大,分别为71.72 MPa和223.6 HV0.3;提出的接头界面形成的理想模型,与XRD测试的物相结果相符合。Using Al foil as the intermediate layer,transient liquid phase diffusion welding experiments were conducted on AZ91 magnesium alloy and TC4 titanium alloy under different process parameters.Microstructure,element diffusion and phase composition of the joint were analyzed by means of scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS)analysis and X-ray diffraction(XRD).The mechanical properties of the joint were tested using microhardness tester and shear test,and an ideal model for the formation process of the joint interface was proposed.The results show that the diffusion bonding between magnesium alloy and titanium alloy can be achieved at welding temperature range of 480-510℃under pressure of 1 MPa and holding time of 20 min.With the increase of welding temperature,the diffusion of elements at the welding interface is accelerated,the reaction is gradually sufficient,the Al_(12)Mg_(17) and Al_(3)Ti phases are formed,and the performance of the joint increases first and then decreases.When the welding temperature is 500℃,the shear strength and hardness of the joint are the highest,which are 71.72 MPa and 223.6 HV0.3,respectively.The proposed ideal model for the formation of joint interfaces is consistent with the phase results of XRD testing.

关 键 词：AZ91镁合金 TC4钛合金 瞬间液相扩散焊 显微组织 力学性能 

分 类 号：TG453[金属学及工艺—焊接]