Microscopic phase-field simulation for nucleation incubation time of Ni_(75)Al_xV_(25-x)alloy  

作　　者：李永胜 陈铮 卢艳丽 王永欣 张建军 

机构地区：[1]School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China [2]School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China

出　　处：《Journal of Central South University of Technology》2005年第6期635-640,共6页中南工业大学学报（英文版）

基　　金：Project(50071046)supportedbytheNationalNaturalScienceFoundationofChina;project(2002AA331051)supportedbytheNationalHighTechnologyResearchandDevelopmentProgramofChina

摘　　要：With the microscopic phase-field dynamic model, the effects of temperature and concentration on the nucleation incubation time of Ni75AlxV25-x alloy were studied and the relation between the incubation time and precipitation mechanism was investigated by using the atomic occupation probability picture and average order parameter curve. The simulation results demonstrate that there exists the incubation time for different precipitation mechanisms~ such as non-classical nucleation, the mixed style of non-classical nucleation and spinodal decomposition, and spinodal ordering; and the incubation time shortens in turn for the three kinds of mechanisms. With the increase of Al content of Ni75AlxV25-x alloy, the incubation time of Llz phases shortens continuously and that of DOzz phases is prolonged. The effects of temperature on the incubation time of Llz and DOzz phases are accordant, i.e. the incuba- tion time is greatly prolonged with the temperature rising.With the microscopic phase-field dynamic model, the effects of temperature and concentration on the nucleation incubation time of Ni 75AlxV 25-xalloy were studied and the relation between the incubation time and precipitation mechanism was investigated by using the atomic occupation probability picture and average order parameter curve. The simulation results demonstrate that there exists the incubation time for different precipitation mechanisms, such as non-classical nucleation, the mixed style of non-classical nucleation and spinodal decomposition, and spinodal ordering; and the incubation time shortens in turn for the three kinds of mechanisms. With the increase of Al content of Ni 75AlxV 25-xalloy, the incubation time of L12 phases shortens continuously and that of D0 22phases is prolonged. The effects of temperature on the incubation time of L12 and D0 22phases are accordant, i.e. the incubation time is greatly prolonged with the temperature rising.

关 键 词：microscopic phase-field NUCLEATION incubation time order parameter SIMULATION 

分 类 号：TG115.213[金属学及工艺—物理冶金]