Ductile Ti–Ni Alloys With an Equiaxed Microstructure Designed by Tuning the Precipitation Pathway of Ti2Ni

The study focuses on developing ductile Ti–Ni alloys with an equiaxed microstructure by manipulating the precipitation pathway of Ti2Ni. Traditional powder processing methods often result in compositional inhomogeneity, leading to the formation of brittle eutectoids that deteriorate ductility. The authors propose a innovative powder coating strategy involving high-activity Ni nanoparticles, which facilitates rapid and sufficient compositional homogenization. This approach eliminates abnormal precipitation reactions and promotes the formation of equiaxed α-Ti grains, significantly enhancing the ductility of the alloys. The research combines in situ experimental analysis, phase transformation studies, and mechanical testing to provide a comprehensive understanding of the microstructural evolution and mechanical properties of Ti–Ni alloys. The findings offer promising avenues for achieving the desired ductility in eutectoid-element-containing Ti alloys, with potential applications in various industries requiring high-performance materials.