【摘要】 为实现大尺寸铝合金构筑成形，对7050高强铝合金在不同温度和不同保温时间下进行真空热压扩散连接试验，研究界面扩散结合行为和愈合机理。分别在440、450、460、470和480℃下进行扩散连接试验，保温时间为3 h，控制变形量为30%，随后在480℃的基础上将保温时间延长到6 h和9 h。结果表明，随着扩散连接温度升高，氧化膜破裂分解，界面逐渐愈合，连接强度提高，适当延长保温时间也有利于界面愈合。在480℃、保温6 h时，界面抗拉强度达到200 MPa，为基体的74.6%，剪切强度达到165 MPa，为基体的84.2%，界面处硬度也与两侧基体相当。更多还原

【Abstract】 To achieve the construction and forming of large-sized aluminum alloys, vacuum hot pressing diffusion bonding tests were conducted on 7050 high-strength aluminum alloy at different temperatures and holding time to investigate the interfacial diffusion bonding behavior and healing mechanism. Diffusion bonding tests were carried out at 440, 450, 460, 470, and 480 ℃, with holding time of 3 h and deformation of 30%. Subsequently, the holding time was increased to 6 h and 9 h at 480 ℃. The results indicate that the oxide film is ruptured and decomposed as the diffusion bonding temperature rises, and the interface is gradually healed with increasing connection strength. Appropriate extension of holding time is also beneficial to interface healing. Under the conditions of 480 ℃ and 6 h, the tensile strength and shear strength of interface reach 200 MPa and 165 MPa, which is 74.6% and 84.2% of the matrix, respectively, and the hardness at the interface is also comparable to that of the lateral matrices.更多还原