本团队硕士生司明达等在Intermetallics发表研究论文。

摘要：Tensile rheological behavior of the Zr35Ti30Be27⋅5Cu7.5 metallic glass under conditions of high strain rates (strain  rates ranging from 0.05 s − 1 to 0.5 s − 1 ) within the supercooled liquid region was studied. The stress-strain curve  reveals that this metallic glass demonstrates non-Newtonian flow characteristics under these circumstances. The  peak stress associated with stress overshoot increases as temperature decreases and strain rate increases. However, the steady-state flow stress displays an anomalous decrease due to rapid necking at high strain rates.  Subsequently, the thermal processing map of the Zr35Ti30Be27⋅5Cu7.5 metallic glass was established and analyzed.  It reveals that the alloy has relatively excellent thermoplastic forming ability at temperature between 630 K and  655 K and strain rates between 0.05 s − 1 -0.2 s − 1 . We found that under strain rates˙ε≥ 10− 2 s− 1, the strain rate is  the primary factor influencing normalized viscosity. Therefore, we developed a simplified Maxwell-Pulse  constitutive model applicable to metallic glass in the supercooled liquid region under high strain rate conditions, by simplifying the constitutive equation for steady-state flow stress using a simplified formula for  normalized viscosity calculation. The predictions of this simplified modified model align well with experimental  values. By comparing the simplified and unsimplified Maxwell-Pulse constitutive models, the overall fitting  accuracy of the simplified model was improved by 3–5%, with the highest improvement of 67% in the steadystate flow stress stage. These results indicate that the modified model accurately reflects the stress-strain relationship for the Zr35Ti30Be27⋅5Cu7.5 metallic glass under high temperature and high strain rate tensile conditions.