Microstructure and Properties of TA-TC4 Bi-titanium Alloy Fabricated by Electron Beam Additive Manufacturing
TA7-TC4 bi-titanium alloy specimens were prepared by vacuum electron beam fusion deposition,and the microstructure characteristics at TC4 side,TA7 side and intermediate transition zone were investigated.Microstruc-ture,hardness,mechanical properties,fracture mode and fracture morphology of Ti alloy were analyzed.The results indicate that the internal grain of alloy at TA7 side is mainly composed of massive α structure,and the vertical transi-tion layer of acicular martensite transformation phase is observed on the TC4 side with obvious anisotropy in the transi-tion layer.The mechanical properties of TA7-TC4 bititanium alloy are between those of TA7 and TC4 alloys,and the plasticity is satisfied.The hardness of specimens deposited by bi-titanium alloy is as follows:TA7 side＜transition zone＜TC4 side.Fracture analysis reveals that the boundary of transition layer is clear,and the section presents cup-shaped with significant shear fracture.
Electron Beam Additive ManufacturingTA7-TC4MicrostructureMechanical Property
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