自然科学版 英文版
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中南大学学报(英文版)

Journal of Central South University

Vol. 12    No. 6    December 2005

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Microscopic phase-field simulation for
nucleation incubation time of Ni75AlxV25-xalloy
LI Yong-sheng(李永胜)1, CHEN Zheng(陈 铮)1,2, LU Yan-li(卢艳丽) 1,
WANG Yong-xin(王永欣) 1, ZHANG Jian-jun(张建军)1

1. School of Materials Science and Engineering,
Northwestern Polytechnical University, Xi an 710072, China;
2. State Key Laboratory of Solidification Processing,
Northwestern Polytechnical University, Xi an 710072, China

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 L12and D022 phases are accordant, i.e. the incubation time is greatly prolonged with the temperature rising.

 

Key words: microscopic phase-field; nucleation; incubation time; order parameter; simulation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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