WITHDRAWN: Joining of NiTi/Ti6Al4V alloys using copper intermediate thin layer using fiber laser technology

Abstract

Abstract Joining of NiTi and Ti6Al4V has substantial potential for applications in multicomponent energy harvesting, aviation, electronics, and biomedical industries. However, previous studies indicate that an effective joining technique has not been developed which avoid the formation of the brittle intermetallic NiTi/Ti6Al4V. This paper focuses on experimentally investigating the dissimilar joining process of NiTi/Ti6Al4V using a fiber-laser. Thin Cu was applied at the joint as a welding interlayer to minimize the in-situ brittle phase formation during laser processing. Characterization has been done using radiographic analysis, scanning electron microscope, surface roughness test, X-ray diffraction, micro-hardness, and tensile test. The development of complex intermediate phases (such as Cu4Ti3 and CuNi2Ti) observed at the joining interface ceases the development of unwanted brittle phases (such as NiTi2, Ni3Ti4). The joining strength of 353 MPa was obtained by using laser power of 800 W and a scan speed of 17 mm/s. Weldment microstructure shows the presence of a negligible percentage of pores (