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HomeMaterials Science ForumMaterials Science Forum Vols. 704-705Atomic-Scale Computer Simulation for early...

Atomic-Scale Computer Simulation for early Precipitation Process of Ni₇₅Al_XV_25-X Alloy with Middle Al Composition

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Abstract:

The microscopic phase field approach was applied for modeling the early precipitation process of Ni₇₅Al_xV_25-x alloy. Without any a prior assumption, this model can be used to simulate the temporal evolution of arbitrary morphologies and microstructures on atomic scale. Through the simulated atomic pictures, calculated order parameters and volume fraction of the θ (Ni₃V) and γ′ (Ni₃Al) ordered phases, Ni₇₅Al_xV_25-x alloys with Al composition of 0.05, 0.053 and 0.055 (atom fraction) were studied. Results show: For these alloys, θ and γ′ precipitated at the same time. With the increase of Al content, the amount of γ′ phase is increasing and that of θ phase is decreasing; the precipitation characteristic of γ′ phase transforms from Non-Classical Nucleation and Growth (NCNG) to Congruent Ordering + Spinodal Decomposition (CO+SD) gradually, otherwise, the precipitation characteristic of θ phase transforms from Congruent Ordering + Spinodal Decomposition (CO+SD) to Non-Classical Nucleation and Growth (NCNG) mechanism gradually. Both θ and γ′ has undergone the transition process of mixture precipitation mechanism with the characteristic of both NCNG and CO+SD mechanism. No incontinuous transition of precipitation mechanism has been found.

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Physical and Numerical Simulation of Material Processing VI

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Periodical:

Materials Science Forum (Volumes 704-705)

Pages:

1328-1337

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.704-705.1328

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Online since:

December 2011

Authors:

Yu Hong Zhao, Hua Hou, Yu Hui Zhao

Keywords:

Atomic Pictures, Computer Simulation, Early Precipitation Mechanism, Order Parameter, Volume Fraction

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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[1] J . W Cahn, J E Hilliard: J. Chem. Phys. Vol. 28-2 (1958), p.258.

[2] J . W Cahn, J E Hilliard: J. Chem. Phys. Vol. 31-3(1959), p.688.

[3] L.Q. C hen: Annu. Rev. Mater. Res. Vol. 32(2002), p.113.

[4] R. Poduri, L. Q Chen: Acta mater. Vol. 46 (1998) , p.3915.

[5] T. Miyazaki, T. Koyama and T. Kozakai: Materials Science and Engineering. Vol. A312(2001) , p.38.

[6] S. Müller, L . Wang and A. Zunger: Modeling Simul. Mater. Sci. Eng. Vol. 10 (2002), p.131.

[7] L. Q C hen, Y . Z . W ang : JOM. Vol. 12(1996), p.12.

[8] R. Poduri, L. Q Chen: Acta mater. Vol. 45(1997), p.245.

[9] R. Poduri, L. Q Chen: Acta mater. . Vol. 44(1996), p.4253.

[10] T. Koyama, T. Miyazaki and M. Mebed: Metallurgical and Materials Transactions A. Vol. 26A(1995), p.2617.

[11] D. Y Li, L. Q Chen: Acta mater. Vol . 37(1997), p.1271.

[12] R. Poduri, L. Q Chen: Acta mater. Vol. 46(1998), p.1719.

[13] C. Pareige, D. Blavette: Scripta mater. Vol. 44(2001), p.243.

[14] H. Wendt, P. Hassen: Acta metal. Vol. 31(1993), p.1649.

[15] D. Banerjee, R. Banerjee andY. Wang: Scripta Materialia. Vol. 41(1999), p.1023.

[16] A .J. Ardell, A . Maheshwari: Acta metall mater. Vol. 43(1995), p.1825.

[17] P. Staron, R. Kampmann: Acta mater. Vol. 48(2000), p.701.

[18] P. Staron, R. Kampmann: Acta mater. Vol. 48(2000), p.713.

[19] O. S usuma, K. Noriko, F. Toshiyuki and K. Masaharu: ntermetallics. Vol. 10(2002), p.343.

[20] J.M. Liu: Materials Science and Engineering. Vol. A254, (1998), p.45.

[21] P. R. Rios: Scripta Materialia. Vol. 41(1999), p.1283.

[22] H. Zapolsky, C. P areige, L. Marteau and Blavette D: Calphad. Vol. 25(2001), p.125.

[23] L. Q. Chen: Acta metall mater. Vol. 42(1994), p.3503.

[24] L.Q. Chen A.G. Khachaturyan: Acta metall. mater. Vol. 39(1991), p.2533.

[25] Y. H. Zhao, in: Atomic-Scale Computer Simulation for Alloy during early Precipitation Process. Northwestern Polytechnical University P.H. D Thesis, Xi'an (2003), p.115.

[26] F.K. Legous, Y.W. Lee: Acta Metal. Mater. Vol. 32(1984), p.1837.

[27] K. Binder, M. Krumbar: Phys. Rev. B. Vol. 9(1974), p.2328.

[28] D.W. Heermann. In: Computer Simulation in Physical Metallurgy. Brussels and Luxembourg: Ecsc. (1986), p.245.