The Joint Strength and Fracture Mechanisms of TC4/TC4 and TA0/TA0 Brazed with Ti-25Cu-15Ni Braze Alloy |
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| Authors: | Zhihuan Zou Fanhao Zeng Haobo Wu Jian Liu Yi Li Yi Gu Tiechui Yuan Fuqin Zhang |
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| Affiliation: | 1.The National Key Laboratory of Science and Technology on High-Strength Lightweight Structural Materials,Central South University,Changsha,China;2.Shanxi Coal and Chemical Technology Institute,Xi’an,China;3.The State Key Laboratory of Powder Metallurgy,Central South University,Changsha,China |
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| Abstract: | In this paper, Ti-25Cu-15Ni (mass ratio) braze alloys were prepared by vacuum arc melting. Additionally, the TA0 pure titanium and TC4 titanium alloy were brazed with the Ti-25Cu-15Ni braze alloy at 960, 980, 1000, 1020, and 1040 °C. The effects of the braze temperature on the tensile strength of the TA0 and TC4 joints and their fracture mechanisms were studied. The maximum tensile strength of the TA0 joints of 219.9 ± 0.1 MPa was achieved at a brazing temperature of 980 °C, and the maximum tensile strength of the TC4 joints of 832.9 ± 0.1 MPa was achieved at the same brazing temperature. These results indicate that their ideal joint strength is comparable. According to the fractography results of the TA0 joints, a mixed fracture morphology is indicated. The TA0 fracture surface is dominated by cleavage fracture with a small contribution from ductile fracture. The TC4 joint fracture arises from cleavage. |
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