Acta Metall Sin  2005, Vol. 41 Issue (7): 695-702     DOI:

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Prediction for the Early Precipitation Process of Ni75AlxV25-X System with Lower Al Concentration by the Phase-Field Model

HOU Hua; ZHAO Yuhong; CHEN Zheng; XU Hong

Department of Materials Science & Engineering; North China Institute of Technology; Taiyuan 030051

HOU Hua; ZHAO Yuhong; CHEN Zheng; XU Hong. Prediction for the Early Precipitation Process of Ni75AlxV25-X System with Lower Al Concentration by the Phase-Field Model. Acta Metall Sin, 2005, 41(7): 695-702 .

Abstract References Related Articles Recommended Metrics Download:  PDF(534KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The microscopic phase--field approach was used in modeling the early precipitation process of Ni75AlxV25-x alloy with lower Al concentration on an atomic scale through the simulation of atomic pictures, calculation of order parameter profiles and change of volume fraction of the ordered phases. The results show that ordered phases precipitated and formed a pseudobinary system; precipitated earlier than g phase by a congruent ordering + spinodal decomposition (CO+SD) mechanism and thus produced a nonstoicheometric ordered phase, then the nonstoicheometric g phase precipitated by a non--classical nucleation and growth (NCNG) mechanism at the boundaries of phases, meanwhile, both of them transformed to stoicheometric ordered phases. With the increase of Al composition, the congruent ordering process of phase becomes more slow, and g phase precipitation becomes earlier, the occupation percentage of gincreased and that of phase decreased. Key words:  microscopic phase--field approach      computer simulation       Received:  30 August 2004      ZTFLH:  TG146.2   Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors HOU Hua ZHAO Yuhong CHEN Zheng XU Hong URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2005/V41/I7/695 [1] Chen L Q, Vaith Y V, Liu Z K. www.mrs.org/publications/ bulletin. 2001; March: 197 [2] Chen L Q, Khachaturyan A G. Acta Metall Mater, 1991; 39: 2533 [3] Chen L Q, Khachaturyan A G. Scr Met Mater, 1991; 25: 61 [4] Koyama T, Miyazaki T, Mebed M. Metall Mater Trans, 1995; 26A: 2617 [5] Miyazaki T, CALPHAD, 2001; 25: 231 [6] Rubin G, Khachaturyan A G. Acta Mater, 1999; 47: 1995 [7] Pareige C, Blavette D. Scr Mater, 2001; 44: 243 [8] Poduri R. 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