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Lecture 1: INTERACTION IN THE SYSTEM Li2O-TiO2-MnxOy; Lecture 2:STRUCTURE FORMATION IN EUTECTIC COMPOSITES: PHASE FIELD SIMULATIONS
发布时间: 2019-06-26 14:37 | 【 【打印】【关闭】

SEMINAR 

The State Key Lab of High Performance Ceramics and Superfine Microstructure 

Structural Ceramics Engineering Research Center 

中国科学院上海硅酸盐研究所 

    

Lecture 1  INTERACTION IN THE SYSTEM Li2O-TiO2-MnxOy 

SpeakerDr. Sci. Sergij Lakiza 

Institute for Problems in Materials Science, National Academy of Sciences of Ukraine 

    

Lecture 2STRUCTURE FORMATION IN EUTECTIC COMPOSITES: PHASE FIELD SIMULATIONS 

SpeakerProf. Oleksiy Bystrenko 

Institute for Problems in Materials Science, National Academy of Sciences of Ukraine 

      

时间:627日(周四)下午13:30 

地点:嘉定园区G3第一会议室  

联系人:张景贤研究员,刘建军研究员 

       

  Lecture 1INTERACTION IN THE SYSTEM Li2O-TiO2-MnxOy 

  1. What is Li-batteries? 

  2. Why the system Li2O-TiO2-MnO? 

  3. What is phase diagram? 

  4. The system Li2O-TiO2-MnO 

  5. The influence of alternative atom valence. 

  6. Constructing of preliminary phase diagram. 

  7. First experimental results. 

  8. Comparison of preliminary phase diagram construction results in thsystems with different Mn valence. 

  9. Resume and further development. 

  Lecture 2STRUCTURE FORMATION IN EUTECTIC COMPOSITES: PHASE FIELD SIMULATIONS 

  Abstract The idea of how to use the phase field theory for the description of structure in eutectic composites is illustrated at an example of LaB6-ZrB2 ceramics. Computer simulations of structurization in boride–boride ceramics are performed using the standard version of phase-field theory. The simulations reproduce the main properties of eutectic structures observed in experiments, i.e., spatial segregation of components, structure formation from an overcooled melt, and complete decomposition of the system when it relaxes toward thermodynamic equilibrium. The eutectic colonies formed in the process of directional solidification and the dependence of spatial parameter of the emerging structures on the solidification rate are reproduced as well. The simulations demonstrate that the ordered fibrous structures are formed only in a certain range of solidification rates. In addition, the the use of multicomponent phase field theory is illustrated at an example of a 3-component model eutectic system. 

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