| Microscopic phase-field simulation for nucleation incubation time of Ni_(75)Al_xV_(25-x)alloy |
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| 作者姓名： | 李永胜 陈铮 卢艳丽 王永欣 张建军 |
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| 作者单位： | School of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 China，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，School of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 China，School of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 China，School of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 China |
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| 基金项目： | Project(50071046)supportedbytheNationalNaturalScienceFoundationofChina，project(2002AA331051)supportedbytheNationalHighTechnologyResearchandDevelopmentProgramofChina |
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| 摘 要： | 1INTRODUCTION Theincubationtimeandnucleationofalloysinprecipitationprocesshavebeenofscientificinterestformanyyearsduetotheirimportanceinphasetransformation13].Theincubationtimehasdirectrelationswithprecipitationmechanism,soitcer tainlyaffectsthemorphologyofalloytosomeex tent.Howevertheincubationtimeisveryshortanddifficulttomeasurewithexperimentalmeth ods.Withthecomputersimulationtechnique,theinstantaneousmessageoftheincubationtimeandprecipitationmechanismsonnanometricscalecanbeobtained.K…
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Microscopic phase-field simulation for nucleation incubation time of Ni75AlxV25-x alloy |
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| LI Yong-sheng,CHEN Zheng,LU Yan-li,WANG Yong-xin,ZHANG Jian-jun.Microscopic phase-field simulation for nucleation incubation time of Ni_(75)Al_xV_(25-x)alloy[J].Journal of Central South University of Technology,2005,12(6). |
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| Authors: | LI Yong-sheng CHEN Zheng LU Yan-li WANG Yong-xin ZHANG Jian-jun |
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| Abstract: | 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 L12 phases shortens continuously and that of D022 phases is prolonged. The effects of temperature on the incubation time of L12 and D022 phases are accordant, i.e. the incubation time is greatly prolonged with the temperature rising. |
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| Keywords: | microscopic phase-field nucleation incubation time order parameter simulation |
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