Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 20    No. 4    April 2010

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Microscopic phase-field study on aging behavior of Ni75Al17Zn8 alloy
ZHAO Yan(赵 彦)1, CHEN Zheng(陈 铮)1, 2, LU Yan-li(卢艳丽)1, ZHANG Li-peng(张利鹏)1

1. College 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:The precipitating kinetics of Ni75Al17Zn8 alloy was studied at both 873K and 973K by microscopic phase-field model. The calculation results show that the order−disorder transformation experiences the matrix → lowly-ordered L10 phase → L12 phase at 973 K. And the nucleation of L12 particles belongs to the spinodal decomposition mechanism. As temperature increases, orderings of Al and Zn atoms are resisted, but coarsening of L12 particles is promoted. The value of coarsening kinetic exponents approaches to 1/2. In addition, the discussions about Ni-Al anti-site defect and Zn substitutions for Ni site and Al site exhibit that the higher the temperature, the more distinctive the Ni-Al anti-site defect, but the less the Zn substitution.


Key words: microscopic phase-field; Ni75Al17Zn8 alloy; coarsening behavior

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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