【摘 要】
：
Vacuum brazing of TiAl alloy to 40Cr steel was carried out in a vacuum furnace using Ti40Zr10Cu34.95Ni11.2Sn3.85,Ti51Zr8.7Cu24.5Ni11.8Sn4 and pure copper foils,
【机 构】
：
School of Materials Science and Engineering,Key Laboratory of Materials Modification by Laser
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Vacuum brazing of TiAl alloy to 40Cr steel was carried out in a vacuum furnace using Ti40Zr10Cu34.95Ni11.2Sn3.85,Ti51Zr8.7Cu24.5Ni11.8Sn4 and pure copper foils, and the microstructure and microhardness of the resultant joints were investigated. The experimental results reveal that FeTi compounds formed in the brazing seam made with pure copper foil.However,the FeTi compounds were not detected when using Ti-Zr-Cu-Ni-Sn foils and the brazing seams were composed of two layers,one layer mixed Ti (Ni,Cu) Al and Ti-Al compounds,and the other mixed the filler metal matrix with Ti-Sn and Ti (Ni,Cu) compounds. The microhardness test results show that the brazing seams have higher microhardness values than the TiAl alloy and 40Cr steel base metals.Moreover,the microhardness in the brazing seam made with Ti51Zr8.7Cu24.5Ni11.8Sn4 is higher than those made with Ti40 Zr10Cu34.95Ni11.2Sn3.85 and pure copper.
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