论文标题
沿交替的方向进行弹性压缩的金属眼镜加速恢复活力
Accelerated rejuvenation in metallic glasses subjected to elastostatic compression along alternating directions
论文作者
论文摘要
使用分子动力学模拟研究了静态应力和交替载荷方向对无形合金势能和机械性能的影响。模型玻璃是通过二进制混合物表示的，该二进制混合物首先缓慢退火远低于玻璃过渡温度，然后沿单个方向或沿两个和三个交替的方向进行弹性静电载荷。我们发现，在足够大的静态应力值下，二元玻璃通过原子的集体，不可逆的重排而复兴。在加载方案中包含静电应力的附加取向后，会放大复兴效果，并且具有较大非承包位移的原子簇的典型大小增加。由于延长的机械负载，弹性模量和启动连续压缩期间应力过时的峰值显着降低，尤其是对于具有交替应力取向的加载方案。这些发现对于设计新的加工方法以改善金属玻璃的机械性能很重要。
The influence of static stress and alternating loading direction on the potential energy and mechanical properties of amorphous alloys is investigated using molecular dynamics simulations. The model glass is represented via a binary mixture which is first slowly annealed well below the glass transition temperature and then subjected to elastostatic loading either along a single direction or along two and three alternating directions. We find that at sufficiently large values of the static stress, the binary glass becomes rejuvenated via collective, irreversible rearrangements of atoms. Upon including additional orientation of the static stress in the loading protocol, the rejuvenation effect is amplified and the typical size of clusters of atoms with large nonaffine displacements increases. As a result of prolonged mechanical loading, the elastic modulus and the peak value of the stress overshoot during startup continuous compression become significantly reduced, especially for loading protocols with alternating stress orientation. These findings are important for the design of novel processing methods to improve mechanical properties of metallic glasses.
