(哈尔滨工业大学 材料科学与工程学院, 哈尔滨 150001)
摘 要: 在不同温度、压力、保温时间下对TB2钛合金进行了扩散连接实验，利用SEM观察了扩散连接接头断口形貌并进行了分形维数计算，通过剪切实验得到了不同条件下的扩散连接接头的剪切强度。结果表明，连接温度、保温时间、连接压力对TB2钛合金扩散连接接头的剪切强度和分形维数都有影响。剪切强度和分形维数呈正相关，工艺参数为扩散连接温度850℃，保温时间30min，连接压力5MPa时接头的剪切强度最高（890MPa），同时，表面分形维数最大（2.23）。
关键字: 扩散连接；TB2钛合金；剪切强度；分形维数
（School of Materials Science and Engineering,
Harbin Institute of Technology, Harbin 150001, China）
Abstract:The diffusion welding experiment on, TB2 titanium alloy was carried out on Gleeble-1500 simulation tester. The microstructures of the welding joints in the experiment were analyzed through SEM and fractal dimensions of fracture surface were calculated. In addition, the shearing strengths of the welding joints under various experimental conditions were obtained through shearing experiment and some investigations on the strength of the joint were carried out. The experiments show that the welding temperature, time and pressure have great influence on the shearing strength and fractal dimension of the diffusion welding joints. The shearing strength of the diffusion bonding joint and fractal dimension have positive relation. The highest shearing strength of the joint (890MPa) and the highest fractal dimension arrive at the same time when the welding process parameters are 900℃, 30min and 5MPa.
Key words: diffusion welding; TB2 titanium alloy; shearing strength; fractal dimension
