Cup-cone statistical investigation assess the relationship between the micro-structure and spall strength of metallic glasses under planar impact loadings

作者：Tang, W. X.; Tang, X. C.; Mo, Y. H.; Meng, L. Y.^*; Yao, X. H.^*

来源：Journal of Alloys and Compounds, 2023, 940: 168862.

DOI：10.1016/j.jallcom.2023.168862

• Amorphous alloy
• Dynamic loading experiment
• Finite element method
• Microstructure
• Fracture morphology

Modern industries including the aircraft, rail transportation, and military equipment necessitate a thorough grasp of the dynamic fracture process of materials. Metallic glass, as a typical high-performance modern material, has a broad application prospect in these areas. However, its trans-scale damage evolution process is still shrouded in veil. In this work, we conducted systematic dynamic loading experiments to investigate a distinctive "cup-cone structure" phenomenon that emerges on fracture surface of metallic glass as the impact energy increases. We proposed a new approach of statistical analysis centred on the idea of neighbouring nucleation sites. On the basis of this defect statistical technique, the correlation between the initial nucleation density and spall strength was clarified. The result implies that the macro response does not provide a complete picture of the information regarding the evolution of microstructure. In addition, the meso statistical analysis can play a greater role in establishing the structural-performance correlation.

• 单位
  中国科学院