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利用真空电阻炉对T2紫铜和2A12硬铝进行真空扩散焊接,利用光学金相显微镜(OM)、扫描电镜(SEM)、电子探针(EPMA)和显微硬度计对结合区的组织形貌和成分以及显微硬度进行表征与测试,研究焊接工艺对T2/2A12双金属复合材料组织与性能的影响。结果表明:当扩散温度为700℃、保温60 min时,制备的T2/2A12复合材料结合区宏观界面清晰,未见明显焊接缺陷,出现Cu_3Al_2、Cu_9Al_4、Cu Al金属间化合物,金属间化合物对结合区的强化作用使其硬度显著升高;溶解层随扩散温度的升高和保温时间的延长而增厚,晶粒逐渐粗大,γ_2相在δ相区的溶解量增加。
The T2 red copper and 2A12 duraluminum were vacuum-diffused using a vacuum resistance furnace. The microstructure of the junction area was characterized by optical microscope (OM), scanning electron microscopy (SEM), electron probe (EPMA) and microhardness tester Composition and microhardness were characterized and tested to study the welding process on T2 / 2A12 bimetal composite structure and properties. The results show that when the diffusion temperature is 700 ℃ and holding time is 60 min, the macroscopic interface of the prepared T2 / 2A12 composites is clear and no obvious welding defects are found. The intermetallic compounds Cu_3Al_2, Cu_9Al_4 and CuAl appear, The hardness of the dissolution zone increases significantly with the increase of diffusion temperature and holding time, and the grains gradually become coarse. The dissolved amount of γ_2 phase increases in δ phase zone.