Intrinsic mechanisms influencing the tensile fracture reliability of CuZr‐based amorphous microwires
Shuang Su, Changyu Liu, Xin Su, Yagnesh Shadangi, Guanyu Cao, Zhiliang Ning, Jianfei Sun, Yongjiang Huang, J. Eckert
Abstract
Abstract Amorphous microwires (AMWs) are well known for their high strength and elastic limit, making them excellent candidates for various engineering applications. However, one of the key challenges in utilizing AMWs is their inherent variability in mechanical performance, particularly in achieving stable fracture strength across different compositions. This study provides critical insights into the relationship between microstructure and mechanical behavior by investigating CuZr‐based AMWs with varying compositions during quasi‐static tensile fracture. Specifically, uniaxial tensile tests on Cu 48 Zr 48 Al 4 , Cu 45 Zr 45 Co 10 , and Cu 48 Zr 47.2 Al 4 Nb 0.8 AMWs, combined with log‐normal and Weibull statistical analysis, revealed that Cu 48 Zr 47.2 Al 4 Nb 0.8 exhibits the highest fracture reliability ( m Tr = 3.97) and fracture threshold ( σ μTr = 1307 MPa), while Cu 48 Zr 48 Al 4 showed the lowest performance ( m Tr = 3.08, σ μTr = 1085 MPa). Moreover, a standard power‐law relationship exists between the characteristic size L of the fracture surface and the degree of order O was established, linking atomic mixing enthalpy and atomic radius to structural homogeneity and fracture behavior. This study provides an important perspective for optimizing AMW compositions to achieve higher fracture strength and improve the reliability for engineering applications.