Ding Xiangdong, Aktas Oktay, Wang Xiaofei, Li Suzhi, Zhao Ziyuan, Zhang Libo, He Xiaomei, Lookman Turab, Saxena Avadh, Sun Jun
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiao Tong University, Xi'an 710049, People's Republic of China.
J Phys Condens Matter. 2017 Oct 4;29(39):394002. doi: 10.1088/1361-648X/aa7ea0. Epub 2017 Aug 21.
In this review, we show that the evolution of the microstructure and kinetics of ferroelastic crystals under external shear can be explored by computer simulations of 2D model materials. We find that the nucleation and propagation of twin boundaries in ferroelastics depend sensitively on temperature. In the plastic regime, the evolution of the ferroelastic microstructure under strain deformation maintains a stick-and-slip mechanism in all temperature regimes, whereas the dynamic behavior changes dramatically from power-law statistics at low temperature to a Kohlrausch law at intermediate temperature, and then to a Vogel-Fulcher law at high temperature. In the yield regime, the distribution of jerk energies follows power-law statistics in all temperature regimes for a large range of strain rates. The non-spanning avalanches in the yield regime follow a parabolic temporal profile. The changes of twin pattern and twin boundaries density represent an important step towards domain boundary engineering.
在本综述中，我们表明可以通过二维模型材料的计算机模拟来探索铁弹性晶体在外部剪切作用下微观结构和动力学的演变。我们发现铁弹性体中孪晶界的成核和传播对温度敏感。在塑性状态下，铁弹性微观结构在应变变形下的演变在所有温度范围内都保持着粘滑机制，而动态行为则从低温下的幂律统计急剧变化到中温下的科尔劳施定律，然后在高温下变为沃格尔-富尔彻定律。在屈服状态下，对于大范围的应变速率，急动能量的分布在所有温度范围内都遵循幂律统计。屈服状态下的非跨越雪崩遵循抛物线时间分布。孪晶图案和孪晶界密度的变化是向畴界工程迈出的重要一步。
