可以发现在Cu母材侧钎缝界面处显微硬度明显高于其它钎缝区，最高显微硬度为284.6HV，其它钎缝区显微硬度在187HV上下波动。这进一步表明在Cu侧钎缝界面处有脆硬相生成。

It can be found that the microhardness at the brazing seam interface on the side of the Cu base material is significantly higher than that of other brazing seam areas. The highest microhardness is 284.6HV, and the microhardness of other brazing seam areas fluctuates up and down 187HV. This further indicates that brittle and hard phases are formed at the Cu side brazing joint interface.