Re-analysis of the critical nucleation work in the case of diffusive interface  

作　　者：Ke Zhang Feng Liu Gencang Yang 

机构地区：[1]State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, PR China

出　　处：《Progress in Natural Science:Materials International》2012年第2期100-107,共8页自然科学进展·国际材料（英文版）

基　　金：Projects(51071127,50901059)supported by the National Natural Science Foundation of China;Project(2011CB610403)supported by the National Basic Research Program of China(973 Program);Project(09-QZ-2008 and 24-TZ-2009)supported by the Free Research Fund of State Key Laboratory of Solidification Processing in NWPU;Project(111502)supported by the Huo Yingdong Yong Teacher Fund;the 111 Project(B08040),China

摘　　要：Regarding the inherent limitations of previous thermodynamic description on nucleation,the nucleation work has been re-analyzed for undercooled melts by introducing temperatureand position-dependent thermodynamic quantities in the diffusive interface.At the small undercoolings,the obtained critical nucleation work matches that derived from the classical nucleation theory.With the increasing undercooling,the nucleation work approaches and finally becomes smaller than that from the published theories based on the diffusive interface.Substituting the critical nucleation work predicted by the present approach into the steady-state homogeneous nucleation rate,the nucleation rates for pure Hg and Ga have been calculated.It is shown that the results from the present approach fit the experimental values much better than those from the classical nucleation theory.Particularly,for some metals or alloys,the temperature at which the nucleation work vanishes can be predicted using the present approach.Regarding the inherent limitations of previous thermodynamic description on nucleation, the nucleation work has been re-analyzed for undercooled melts by introducing temperature- and position-dependent thermodynamic quantities in the diffusive interface. At the small undercoolings, the obtained critical nucleation work matches that derived from the classical nucleation theory. With the increasing undercooling, the nucleation work approaches and finally becomes smaller than that from the published theories based on the diffusive interface. Substituting the critical nucleation work predicted by the present approach into the steady-state homogeneous nucleation rate, the nucleation rates for pure Hg and Ga have been calculated. It is shown that the results from the present approach fit the experimental values much better than those from the classical nucleation theory. Particularly, for some metals or alloys, the temperature at which the nucleation work vanishes can be predicted using the present approach.

关 键 词：NUCLEATION Diffusive INTERFACE NUCLEATION WORK INTERFACIAL energy 

分 类 号：O481[理学—固体物理]