Abstract
The 316L/Ti6Al4V bimetallic structure (BS) was fabricated by laser melting deposition (LMD) via introducing a Ni interlayer. The results showed that the addition of Ni interlayer was effective in preventing the formation of brittle Ti-Fe intermetallic compounds. Good metallurgical bonds of 316L/Ni and Ni/Ti6Al4V were obtained, and a certain amount of reactions occurred between the Ni interlayer and Ti6Al4V part. The reaction layer consisting of TiNi3, TiNi and Ti2Ni was formed in the Ni/Ti6Al4V interface, and the thicknesses of the TiNi3, TiNi and Ti2Ni layers were about 20 μm, 70 μm, and 60 μm, respectively. The average ultimate tensile strength of the 316L/Ti6Al4V BS with Ni interlayer was 181.6 MPa, while the 316L/Ti6Al4V BS without Ni interlayer fractured during the LMD process.
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