Chin. Phys. Lett.  2017, Vol. 34 Issue (2): 026401    DOI: 10.1088/0256-307X/34/2/026401
Up-Hill Diffusion of Phase-Separated FeCu Melt by Molecular Dynamics Simulation
Wen-Chao Cui, Chuan-Xiao Peng, Yun Cheng**, Kai-Kai Song, Xue-Lian Li, Zhen-Ting Zhang, Sheng-Zhong Yuan, Li Wang**
School of Mechanical & Electrical and Information Engineering, Shandong University, Weihai 264209
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Abstract Molecular dynamics simulation is performed to characterize the concentration fluctuation of FeCu melts during the liquid–liquid phase separation process, which undergoes the following stages: the formation of interconnected structure and its coarsening, migration and coagulation of droplets driven by the decreasing of potential energy. The up-hill diffusion happens at the early relaxation period in which Cu atoms in Fe-rich region are forced to move toward Cu-rich region by spinodal decomposition with 90% Cu content in Cu-rich region and 95% Fe content in Fe-rich region at temperature of 1500 K. The higher diffusion rate of homogeneous atom can be observed at lower temperature, which is attributed to the larger potential energy difference between Cu-rich region and Fe-rich region. It also exhibits energy heterogeneity in the separated liquid. The domain size decreases sharply during the aggregation and coarsening of droplets, after that it keeps unchanged until the coagulation of droplets begins. The studies characterize concentration and energy heterogeneity of phase-separated liquid on the atomic scale.
Received: 06 October 2016      Published: 25 January 2017
PACS:  64.75.Gh (Phase separation and segregation in model systems (hard spheres, Lennard-Jones, etc.))  
  65.20.-w (Thermal properties of liquids) (Thermal diffusion and diffusive energy transport)  
Fund: Supported by the National Natural Science Foundation of China under Grant No 51371108, 51501104 and 51501103.
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Wen-Chao Cui, Chuan-Xiao Peng, Yun Cheng et al  2017 Chin. Phys. Lett. 34 026401
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Wen-Chao Cui
Chuan-Xiao Peng
Yun Cheng
Kai-Kai Song
Xue-Lian Li
Zhen-Ting Zhang
Sheng-Zhong Yuan
Li Wang
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