Formation of nanometer coherent structures during spinodal decomposition and ordering coexistence phase transformation in Fe-24Al alloys

The nanometer coherent structure evolution of spinodal decomposition and ordering coexistence phase transformation in Fe-24Al alloys is investigated by the microscopic phase field kinetic model. The results show that the concentration and long-range order parameters all continuously change towards to their equilibrium values during phase transformation. With the increase of elastic interaction energy, the anisotropy along [01] or [10] elastic soft direction is more obvious and the time reaching equilibrium state is also shortened. According to the results, the formation of nanometer coherent structures during phase transformation is composed of the initial decreasing stage of order degree stage, the incubation stage, the continuous increasing stage of concentration order parameter and long-range order parameter, and the later stable stage. The spinodal decomposition and ordering is interaction; the initial ordering stage is a necessary condition of the coexistence phase transformation. The nanometer coherent structures are not found to grow during the whole phase transformation. The simulation results are in accordance with the results in experiment obtained by the aging treatment in Fe-24Al alloys.     

基于视频信息的高速公路隧道交通管控技术研究

隧道是道路交通运行安全的关键节点，相较于普通路段，其交通运行风险较高，辐射影响更广。为研究提升高速公路隧道交通运行的效率及安全的有效措施，采用视频检测算法提取隧道交通运行信息，提出一种基于隧道监控视频信息的高速公路交通运行状态监测方法，并搭建管控平台，为现有运营高速公路隧道行车安全提供了前沿性研究和现实保障。