用纯金属Ni作中间层扩散连接铝基复合材料

Diffusion Bonding of Aluminium Metal Matrix Composite with Ni Interlayer

采用纯金属Ni作中间层扩散连接氧化铝颗粒增强铝基复合材料（Al2O3P／6061Al），探究了连接温度和保温时间对接头显微结构与力学性能的影响。结果表明，连接温度610～620℃时，连接区主要由Al3Ni和Ni在Al中固溶体组成，Al2Ni含量随连接温度升高、保温时间延长而减少；连接温度630℃时，连接区主要由Al2O3颗粒和Ni在Al中固溶体组成，Al2O3颗粒偏聚于接头中心。连接温度620℃、保温时间5～120min条件下，接头抗剪强度68-93MPa，断裂于连接区与母材界面；连接温度630℃、保温时间5～120min条件下，接头抗剪强度93-97MPa，断裂于增强相偏聚区。

The effects of bonding temperature and bonding time on the microstructure and mechanical property of diffusion bonded aluminium-based metal matrix composite Al2O3P/6061Al joint with Ni interlayer have been investigated. The experimental results show that, within the bonding temperature range of 610-620℃, the bonding region mainly consists of Al3Ni and aluminium solid solution, and with increasing the bonding temperature and holding time results in the decrease of the amount of Al3Ni in the joint. At the bonding temperature 630℃, the bonding region mainly consists of alumina particle and aluminium solid solution, in which alumina particles segregate in the center of the joint. For the joint bonded at 620℃/5 120min, shear strength is 68-93MPa and fracture occurs at the bonding region/base metal interface. For the joint bonded at 630℃/5 min-120min, shear strength is 93- 97MPa and fracture occurs at alumina particle segregation region.