Predicting microsegregation in multicomponent aluminum alloys – progress in thermodynamic consistency
作者： Andrea Löffler , Klaus Hack , Markus Rettenmayr
DOI: 10.3139/146.110423
关键词:
摘要: Recent developments in modeling the interaction of thermodynamics and kinetics during microsegregation formation multicomponent alloys are reported. A model accounting for solid state back diffusion, dendrite arm coarsening, tip undercooling, eutectic undercooling thermodynamic correction interface concentrations is presented. By coupling solution diffusion equation liquid phases with thermochemistry library ChemApp, phase equilibria at solid-liquid calculated each time step. Using an activity based method identifying multiphase metastable extensions stability range phases, a thermodynamically consistent implementation systems achieved. The equipped user-friendly that allows setting parameters interactively presents results (solute distribution, fractions, secondary spacing) pertinent way.
hanser-elibrary.com参考文章(24)
W. J. Boettinger, S. R. Coriell, Microstructure Formation in Rapidly Solidified Alloys Springer, Dordrecht. pp. 81- 109 ,(1986) , 10.1007/978-94-009-4456-5_5
L. Thuinet, H. Combeau, A new model of microsegregation for macrosegregation computation in multicomponent steels. Part I: theoretical formulation and algorithm Computational Materials Science. ,vol. 45, pp. 294- 304 ,(2009) , 10.1016/J.COMMATSCI.2008.09.023
M. Carrard, M. Gremaud, M. Zimmermann, W. Kurz, About the banded structure in rapidly solidified dendritic and eutectic alloys Acta Metallurgica Et Materialia. ,vol. 40, pp. 983- 996 ,(1992) , 10.1016/0956-7151(92)90076-Q
X. Yan, S. Chen, F. Xie, Y.A. Chang, Computational and experimental investigation of microsegregation in an Al-rich Al–Cu–Mg–Si quaternary alloy Acta Materialia. ,vol. 50, pp. 2199- 2207 ,(2002) , 10.1016/S1359-6454(01)00431-1
M. Buchmann, M. Rettenmayr, Rapid solidification theory revisited – A consistent model based on a sharp interface Scripta Materialia. ,vol. 57, pp. 169- 172 ,(2007) , 10.1016/J.SCRIPTAMAT.2007.02.039
A. Jacot, M. Rappaz, A two-dimensional diffusion model for the prediction of phase transformations: Application to austenitization and homogenization of hypoeutectoid Fe-C steels Acta Materialia. ,vol. 45, pp. 575- 585 ,(1997) , 10.1016/S1359-6454(96)00199-1
V. R. Voller, S. Sundarraj, Modelling of microsegregation Materials Science and Technology. ,vol. 9, pp. 474- 482 ,(1993) , 10.1179/MST.1993.9.6.474
A. Roósz, E. Halder, H. E. Exner, Numerical calculation of microsegregation in coarsened dendritic microstructures Materials Science and Technology. ,vol. 2, pp. 1149- 1155 ,(1986) , 10.1179/MST.1986.2.11.1149
B. Dutta, M. Rettenmayr, Microsegregation and its effects on quantity and morphology of secondary phases during solidification of Al-Fe-Si alloys Materials Science and Technology. ,vol. 18, pp. 1428- 1434 ,(2002) , 10.1179/026708302225007655
B. Dutta, O. Pompe, M. Rettenmayr, Quantitative image analysis for evaluation of eutectic fractions in as cast microstructures Materials Science and Technology. ,vol. 20, pp. 1011- 1018 ,(2004) , 10.1179/026708304225022025