Ti60钛合金扩散连接边界缺陷研究  

Study on boundary defects of diffusion bonding of Ti60 titanium alloy

作　　者：张俊杰 殷宏亮 辛吉 柴尚森 武永 ZHANG Jun-jie;YIN Hong-liang;XIN Ji;CHAI Shang-sen;WU Yong(College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China;The Second Military Representative Office of the Air Force Department in Beijing Aera,Beijing 100074,China)

机构地区：[1]南京航空航天大学机电学院,江苏南京210016 [2]空军装备部驻北京地区第二军事代表室,北京100074

出　　处：《塑性工程学报》2025年第4期74-81,共8页Journal of Plasticity Engineering

基　　金：工信部制造业高质量发展专项(2023ZY01010-05)。

摘　　要：采用实验与仿真相结合的方法探究了Ti60钛合金扩散连接边界缺陷形成机理以及边界缺陷对扩散连接接头力学性能的影响。在温度910~970℃,时间1~3 h,压力1~4 MPa的条件下制备了Ti60钛合金扩散连接试样,研究了扩散界面的显微组织、剪切强度与剪切断口形貌,并利用ABAQUS有限元仿真软件分析了扩散连接过程中Ti60钛合金的蠕变行为。结果表明,随扩散温度的升高与时间的延长,接头剪切强度增大。随扩散压力的升高,剪切强度先增大后减小,且边界区域剪切强度低于中心区域。这是由于扩散连接接头边界区域发生塑性应变与应力集中,导致扩散界面产生了未焊合、凹陷、裂纹与晶粒粗大等边界缺陷,降低了扩散连接接头性能。通过对比分析,Ti60钛合金扩散连接的最佳工艺参数为950℃、2 MPa、2 h。The forming mechanism of boundary defects in diffusion bonding and the influence of boundary defects on the mechanical properties of Ti60 titanium alloy diffusion bonding joints were studied by the combination of experiment and simulation.Ti60 alloy diffusion bonding specimens were prepared under the condition of temperature of 910-970℃,time of 1-3 h,and pressure of 1-4 MPa.The microstructure,shear strength and shear fracture morphology of diffusion interface were studied,and the creep behavior during diffusion bonding process was analyzed by ABAQUS finite element simulation software.The results indicate that with the increase of diffusion temperature and the prolongation of time,the shear strength of joint increases.With the increase of diffusion pressure,the shear strength of joints first increases and then decreases and the shear strength in the boundary area is lower than that in the central area.This is due to plastic strain and stress concentration in the boundary area of diffusion bonding joints,resulting in boundary defects such as unwelded,recessed,crack and coarse grain on diffusion interface,which reduces the performance of diffusion bonding joints.Through comparative analysis,the optimum diffusion bonding parameters for Ti60 titanium alloy are as follows:950℃,2 MPa and 2 h.

关 键 词：Ti60钛合金 扩散连接 边界缺陷 剪切强度 

分 类 号：TG132[一般工业技术—材料科学与工程]