Author(s): Zhang, X (Zhang, Xiang); Hou, CY (Hou, Chuanyu); Dun, BW (Dun, Bowen); Wei, R (Wei, Ran); Ravanbakhsh, H (Ravanbakhsh, Hossein); Li, P (Li, Peng); Wang, ZX (Wang, Zhenxing); Wu, YD (Wu, Yuanda); Song, XH (Song, Xiaohui); Zhao, HD (Zhao, Huadong); Li, Q (Li, Qian)
Source: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING Volume: 787 Article Number: 139503 DOI: 10.1016/j.msea.2020.139503 Published: JUN 10 2020
Abstract: Metallic glass with thermoplastic properties in the supercooled liquid region is a potential type of material for fabricating micro molds. Fatigue behavior of metallic glass is the crucial property that enables it to serve as a mold material. Here, fatigue and fracture behaviors of the micro-sized Zr41.2Ti13.8Cu12.5Ni10Be22.5 (at.%, Vit1) metallic glass micropillars were investigated by uniaxial compression-compression fatigue tests. It was shown that the micropillars have fatigue-endurance limit of similar to 1000 MPa and a fatigue ratio of similar to 0.56. The effects of sample size and heat treatment on the fatigue limit were also studied. After annealing at 450 degrees C, the fatigue limit decreased to similar to 600 MPa and the fatigue ratio decreased to similar to 0.43. The fracture angles between the stress axis and the shear plane of unannealed metallic glass were found to be similar to 42 degrees, while the annealed Vit1 micropillars failed in break or splitting modes. These findings provided the experimental evidence for the inhomogeneous structure and the size effect in metallic glass failure modes at the micro-scale size. Our results can serve as a guideline for further studies to investigate the mechanical behavior and deformation mechanisms of the metallic glass.
Accession Number: WOS:000541741800023
ISSN: 0921-5093
eISSN: 1873-4936
Full Text: https://www.sciencedirect.com/science/article/pii/S0921509320305839?via%3Dihub