%0 Journal Article
%T Simulation study of effects of initial melt temperature on microstructure of liquid metal Na during solidification processes<br>熔体初始温度对液态金属Na凝固过程中微观结构影响的模拟研究
%A Hou Zhao-Yang
%A Liu Rang-Su
%A Wang Xin
%A Tian Ze-An
%A Zhou Qun-Yi
%A Chen Zhen-Hua
%A <br>侯兆阳
%A 刘让苏
%A 王鑫
%A 田泽安
%A 周群益
%A 陈振华
%J 物理学报
%D 2007
%I 
%X Molecular dynamics simulation study has been performed on the effects of thermal history of initial melt temperature on microstructures during solidification of liquid metal Na. The pair distribution function g(r) curves, the bond-type index method and the cluster-type index method have been used to analyze the variations of microstructures during the solidification process. The results show that the solidification structures of liquid metal Na at the cooling rate of 1×1011 K/s with different initial melt temperatures are always crystalline. The 1661 and 1441 bond-types or the bcc basic cluster (14 6 0 8) in the system play the critical role in the microstructure transitions. At the same time, it has been found that the effects of initial melt temperature on solidification microstructures are very remarkable, while they are not obvious in liquid and supercooled states, and the effects can be fully displayed only near the crystallization temperature Tc. The results also demonstrate that the effects of initial melt temperature on the crystallinity of solidification structures are different for different initial melt temperatures. Although the degree of influence is not linearly varying with the decrease of initial melt temperature, it still demonstrate that the influence degree can be controlled through the change of initial melt temperature. The cluster-type index method more clearly describes the cluster configurations in crystal system than the bond-type index method, so it is valuable to deeply investigate the evolution mechanisms of microstructures in liquid metal during solidification processes.
%K liquid metal Na
%K initial melt temperature
%K microstructure
%K molecular dynamics simulation<br>液态金属Na
%K 熔体初始温度
%K 微观结构
%K 分子动力学模拟
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=1488157875EB03E9&yid=A732AF04DDA03BB3&vid=014B591DF029732F&iid=CA4FD0336C81A37A&sid=09D368C679EC819B&eid=663FF78B2ADE7A2D&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=31