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为获得高强度的Ti3Al基合金接头,采用热-力学模拟试验机Gleeble 1500D进行了Ti-23Al-17Nb合金的高真空扩散连接的研究。结果表明,增大连接压力、提高连接温度以及延长保温时间能促进接头界面的焊合,但也会导致接头变形加大和基体相B2的粗化。优化的连接温度、连接压力和保温时间分别为980℃、7 MPa和30 min,其接头室温和650℃拉伸强度为921 MPa和639 MPa,分别达到了原始母材对应温度下的强度的95%和91%。低连接参数下的接头断裂发生于结合界面,而高连接参数下的接头断裂发生于远离结合界面的母材中,其断裂方式属于准解理断裂。
In order to obtain a high strength Ti3Al-based alloy joint, the high vacuum diffusion bonding of Ti-23Al-17Nb alloy was investigated by using a Gleeble 1500D thermo-mechanical simulator. The results show that increasing the connection pressure, increasing the connection temperature and prolonging the holding time can promote the welding of the joint interface, but also lead to the deformation of the joint and the coarsening of the matrix phase B2. The optimal connection temperature, connection pressure and holding time were 980 ℃, 7 MPa and 30 min, respectively. The tensile strength at room temperature and 650 ℃ of joints were 921 MPa and 639 MPa, respectively, reaching 95 % And 91%. The fracture of the joint under the low connection parameter occurs at the bond interface, whereas the fracture of the bond under the high bond parameter occurs in the parent material away from the bond interface, and the fracture mode belongs to quasi-cleavage fracture.