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以50μm厚的纯铜箔作为中间层对AZ31镁合金进行了真空扩散钎焊工艺试验;利用金相显微镜、X射线衍射及显微硬度计对接头扩散区的显微组织及硬度进行了测试与分析。结果表明,在加热温度为520℃、压力为1MPa、保温时间为10～30 min时能得到良好的扩散钎焊接头,扩散钎焊界面区形成了Mg2Cu新相;接头扩散区的显微硬度范围为100～550HV,高于AZ31母材的显微硬度;扩散区靠近镁合金基体的两侧区域的硬度较扩散区中心的硬度高,随着保温时间的延长,扩散区的显微硬度和宽度也相应增大。
The vacuum diffusion brazing process of AZ31 magnesium alloy was carried out with the pure copper foil of 50μm thick as the intermediate layer. The microstructure and hardness of the joint diffusion zone were tested by metallographic microscope, X-ray diffraction and microhardness tester. analysis. The results show that a good diffusion brazed joint can be obtained when the heating temperature is 520 ℃, the pressure is 1MPa and the holding time is 10 ~ 30 min. The new phase of Mg2Cu is formed in the diffusion brazing interface zone. The microhardness of the joint diffusion zone Is 100 ~ 550HV, higher than the AZ31 base metal microhardness; diffusion zone near the magnesium alloy substrate on both sides of the hardness than the diffusion zone center hardness, with the holding time, the diffusion zone hardness and width of the micro Also increased accordingly.