TY - JOUR
T1 - Atomic-scale computer simulation for ternary alloy Ni-Cr-Al during early precipitation process
AU - Chu, Zhong
AU - Chen, Zheng
AU - Wang, Yongxin
AU - Lu, Yanli
AU - Li, Yongsheng
PY - 2005/7
Y1 - 2005/7
N2 - The aging behaviors of Ni-Cr-Al ternary alloy are studied at temperature 873 K based on the mean-field theory, and the early precipitation process is simulated at atomic-scale with microscopic phase-field model. The precipitation mechanism of the low supersaturated alloy Ni-12.2at. %Cr-7.8at. %Al is non-classical nucleation and growth, the L12 structure (Ni3Al) and D022 structure (Ni3Cr) phases precipitate simultaneously, a part of D022 phase transmits to L12 structure phase, and other part retains its previous structure. For high supersaturated alloy, congruent ordering appears first, then followed by spinodal decomposition, the nonstoicheometric ordered phases are produced in this process, which occurs before clustering. The precipitation mechanism of Ni-8at. %Cr-18at. %Al alloy is similar to Ni-10at. %Cr-12at. %Al alloy, but the ordering process of the former is ahead of the latter.
AB - The aging behaviors of Ni-Cr-Al ternary alloy are studied at temperature 873 K based on the mean-field theory, and the early precipitation process is simulated at atomic-scale with microscopic phase-field model. The precipitation mechanism of the low supersaturated alloy Ni-12.2at. %Cr-7.8at. %Al is non-classical nucleation and growth, the L12 structure (Ni3Al) and D022 structure (Ni3Cr) phases precipitate simultaneously, a part of D022 phase transmits to L12 structure phase, and other part retains its previous structure. For high supersaturated alloy, congruent ordering appears first, then followed by spinodal decomposition, the nonstoicheometric ordered phases are produced in this process, which occurs before clustering. The precipitation mechanism of Ni-8at. %Cr-18at. %Al alloy is similar to Ni-10at. %Cr-12at. %Al alloy, but the ordering process of the former is ahead of the latter.
KW - Microscope phase-field model
KW - Ni-Cr-Al
KW - Ordering parameter
KW - Precipitation
KW - Simulation.
UR - http://www.scopus.com/inward/record.url?scp=22844442204&partnerID=8YFLogxK
U2 - 10.1080/10020070512331342700
DO - 10.1080/10020070512331342700
M3 - 文章
AN - SCOPUS:22844442204
SN - 1002-0071
VL - 15
SP - 656
EP - 660
JO - Progress in Natural Science: Materials International
JF - Progress in Natural Science: Materials International
IS - 7
ER -