瞬间液相(TLP)扩散连接GH4169/TC4接头的微观结构及力学性能  

Microstructure and Mechanical Properties of GH4169/TC4 Joints Prepared by Transient Liquid Phase(TLP) Diffusion Bonding

作　　者：王杰[1] 熊清莲 熊宴邻 张富淇 杨锦 Wang Jie;Xiong Qinglian;Xiong Yanlin;Zhang Fuqi;Yang Jin(Southwest Petroleum University,Chengdu 610500,China;Chengdu Sky Combustion Control Technology Co.Ltd,Chengdu 610500,China)

机构地区：[1]西南石油大学,四川成都610500 [2]成都天空燃控科技股份有限公司,四川成都610500

出　　处：《稀有金属材料与工程》2019年第4期1275-1280,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51602269);西南石油大学"过学术关"项目(201499010006)

摘　　要：为制备镍基高温合金/钛合金复合构件,拓展二者应用领域,以Ti/Ni复合箔片作为中间层,采用瞬间液相(TLP)扩散连接技术制备了GH4169高温合金/TC4钛合金接头,并对接头微观结构、力学性能和连接机理进行了研究和探讨。通过扫描电镜(SEM)、X射线衍射仪(XRD)、能谱分析仪(EDS)、万能试验机和显微硬度仪等对GH4169/TC4接头进行连接界面和断口形貌观察、成分表征、剪切性能和显微硬度测试,结果表明:在连接温度960℃,连接压力5 MPa,保温时间30min的工艺条件下,通过中间层与母材之间的元素扩散和化学反应,形成了"GH4169/Ni(s,s)/TiNi_3/Ti_2Ni/Ti/T_i2Ni/Ni/TiNi+Ti_2Ni/TC4"的多层梯度结构接头,除了"Ni/TiNi+Ti_2Ni"界面处存在一定的孔洞和微裂纹,其余各连接界面连续致密,无明显缺陷。所制备GH4169/TC4接头各区域硬度起伏较大,其中,残余Ti层、Ni层区域硬度最低,有利于缓解接头的内应力;GH4169侧界面区域硬度最高,主要是由于连接过程中形成的Ni(s,s)和TiNi_3硬度较高。结合接头剪切性能测试、断口形貌和物相分析,所制备GH4169/TC4接头抗剪切强度达124.6MPa,开裂发生在TC4附近的"Ni/TiNi+Ti_2Ni"界面区域,呈脆性断裂特征。To expand Ni-based superalloy and titanium alloy application fields, the preparation of Ni-based superalloy/titanium alloy composite joints is necessary. The GH4169/TC4 joint was prepared with Ti/Ni composite foils as interlayer by transient liquid phase(TLP)diffusion bonding. The microstructure, mechanical properties and formation mechanism of joint were investigated. The interfaces, fracture,composition and phases of as-prepared GH4169/TC4 joint were analyzed by scanning electronic microscopy(SEM), energy disperse spectroscopy(EDS) and X-ray diffraction(XRD), as well as the shear strength and microhardness of joints were tested by universal testing machine and microhardness tester, respectively. The results show that element interdiffusion and chemical reaction take place in the joining zone and multiple interlayer gradient structure, i.e."GH4169/Ni(s,s)/TiNi3/Ti2Ni/Ti/Ti2Ni/Ni/TiNi+Ti2Ni/TC4" forms between GH4169 and TC4 under the process parameters of 960 ℃, 5 MPa, 30 min. The joint is compact with continuous interfacial bonding without obvious defects except some pores and microcracks exist in the interface of "Ni/TiNi+Ti2Ni". The hardness of each part of the prepared joint is not uniform, among them, the residual Ti and Ni interlayers have lower hardness, which is beneficial to alleviate the internal stress, and the peak value appears in the GH4169 side as a result of the formation of Ni(s,s) and TiNi3. Combined with the shear test, fracture morphology and phase analysis, the shear strength of as-prepared GH4169/TC4 joint achieves 124.6 MPa and fracture occurs in the interface of "Ni/TiNi+Ti2Ni", which presents a brittle characteristic.

关 键 词：GH4169高温合金 TC4钛合金 瞬间液相 扩散连接 

分 类 号：TG456[金属学及工艺—焊接]