Tensile Properties and Fracture Reliability of Melt-extracted Ti-Co Alloy Microwires

Smooth cylindrical Ti-Co alloy microwires were prepared by melt extraction. Their phase constitution, microstructure, tensile properties, and fracture behavior were studied using SEM, XRD, TEM, EBSD, and tensile testing. The microwires consist of a single Ti-Co phase and display a crystallographic texture. The fracture strength falls between 732.43 and 1077.74 MPa, with an average of 932.71 MPa. The scatter in fracture strength was assessed with log-normal and Weibull distributions, giving Weibull moduli of 8.9 (two-parameter) and 7.3 (three-parameter). Fracture surfaces show that failure starts at local defects and then propagates quickly, indicating a quasi-brittle fracture mode. These results describe the fracture behavior and mechanical reliability of melt-extracted Ti-Co alloy microwires. Our results show that the extracted Ti-Co wires possess excellent tensile properties and high fracture reliability, with a high potential for applications in microstructural and functional materials.