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

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 25    No. 2    February 2015

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Phase-field study on competition precipitation process of Ni-Al-V alloy
Yan-li LU, Guang-ming LU, De-wei JIA, Zheng CHEN

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

Abstract:With microscopic phase-field kinetic model, atomic-scale computer simulation program for the precipitation sequence and microstructure evolution of the ordered intermetallic compound γ′ and θ in ternary Ni75AlxV25-x alloy were studied. The simulation results show that Al concentration has important effects on the precipitation sequence. When Al concentration in Ni75AlxV25-x alloy is low, θ(Ni3V) ordered phase will be firstly precipitated, followed by γ′(Ni3Al) ordered phase. With Al concentration increasing, θ and γ′ ordered phases are simultaneously precipitated. With Al concentration further increasing, γ′ ordered phase is firstly precipitated, followed by θ ordered phase. There is a competition relationship between θ and γ′ ordered phases during growth and coarsening process. No matter which first precipitates, θ ordered phase always occupies advantage in the competition process of coarsening, thus, the microstructure with preferred orientation is formed.

 

Key words: Ni-Al-V alloy; microstructure evolution; precipitation process; phase-field method

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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