Department of Mechanical Engineering, Texas Tech University, Box 41021, 7th and Boston, Lubbock, Texas 79409, USA.
Nat Commun. 2013;4:1536. doi: 10.1038/ncomms2546.
A long-sought goal in metallic glasses is to impart ductility without conceding their strength and elastic limit. The rational design of tough metallic glasses, however, remains challenging because of the inability of existing theories to capture the correlation between plasticity, composition and processing for a wide range of glass-forming alloys. Here we propose a phenomenological criterion based on a critical fictive temperature, T(fc), which can rationalize the effect of composition, cooling rate and annealing on room-temperature plasticity of metallic glasses. Such criterion helps in understanding the widespread mechanical behaviour of metallic glasses and reveals alloy-specific preparation conditions to circumvent brittleness.
长期以来，人们一直致力于在不牺牲金属玻璃的强度和弹性极限的前提下赋予其延展性。然而，由于现有理论无法捕捉到广泛的玻璃形成合金的塑性、成分和加工之间的相关性，因此韧性金属玻璃的合理设计仍然具有挑战性。在这里，我们提出了一个基于临界虚拟温度 T(fc)的唯象判据，该判据可以合理地解释成分、冷却速率和退火对金属玻璃室温塑性的影响。该判据有助于理解金属玻璃的广泛力学行为，并揭示了特定于合金的避免脆性的制备条件。
