Preparation of TC4-TA15 Bimetallic Materials by Laser Melting Deposition: Microstructure and Mechanical Properties at the Interfacial Union

The application of laser melting deposition (LMD) technology for the fabrication of bimetallic composites, specifically TC4-TA15, has been explored. Two distinct bimetallic specimens were successfully synthesized through the sequential deposition of complementary alloy powders onto TC4 and TA15 titanium alloy substrates. The research concentrated on the comprehensive analysis of the specimens’ microstructure, phase composition, interfacial characteristics, and mechanical properties. The results showed that the TA 15/TC4 composites had higher yield strength and ultimate tensile strength compared with the TC4/TA15 materials, with a tensile strength of 1055.38 MPa, which was 19.18% higher than that of the TC4 substrate. And a transition region of about 30 μm wide was observed at the TA 15/TC4 interface, which has a good bonding interface and an improved overall performance.