Contribution of the back-diffusion phenomenon to microsegregation of solute for dendritic and cellular growth.

• Autorzy: Wołczyńska W. , Kloch J.
• Konferencja: XVth Physical Metallurgy and Materials Science Conference on Advanced Materials & Technologies AMT'98, 17-21 May 1998, Kraków-Krynica, Poland
• Języki publikacji: EN

Abstrakty

EN

New method for the estimation of solute redistribution in dendritic and cellular growth after back diffusion is developed. The redistribution depends on partition ratio kappa and back-diffusion parameter alpha known in Brody-Flemings theory. A definition for the redistribution coefficient beta is worked out. It enables to satisfy the mass balance at each stage of cellular or dendritic growth. The redistribution coefficient beta operates to increase the value of partition ratio kappa. The model is reducible to both Scheil approach and equilibrium solidification (lever rule). Physical justification for the back-diffusion parameter alpha is given. A modification of the definition for back-diffusion parameter is proposed to apply it to experimental measurements.

Słowa kluczowe

EN

diffusion; microsegregation; solute; crystal growing

PL

dyfuzja; mikrosegregacja; substancja rozpuszczalna; wytwarzanie kryształów

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 1998
• Tom: R. XIX, nr 3
• Strony: 532--535
• Opis fizyczny: Bibliogr. 5 poz., rys.

Twórcy

autor

Wołczyńska W.

• Institute of Metallurgy and Materials Science, Polish Academy of Sciences, Kraków, Poland

autor

Kloch J.

• Institute of Mathematics, Polish Academy of Sciences, Kraków, Poland

• Polish Academy of Sciences, Institute of Metallurgy and Materials Science, Kraków

Bibliografia

• [1] E.Scheil, Z.Metallkunde. 36 (1946) 1.
• [2] J.Lacaze, G.Lesoult, Mater. Sci. Engin. A, 173 (1993) 119.
• [3] H.D.Brody, M.C.Flemings, Trans. AIME, 236 (1966) 615.
• [4] W. Wołczyński, J.Kloch, Bull. Pol. Ac.: Tech., 46 (1998) (to be published).
• [5] T.Umeda, J.Matsuyama, H.Murayama, M. Sugiyama, Tetsu-to Hagane, 63 (1977) 440.