Microstructure Evolution in Rapidly Solidified Immiscible Alloys

Michael  Reuß; Lorenz Ratke; Jiu Zhou Zhao

doi:10.4028/www.scientific.net/MSF.508.37

Paper Titles

Metallurgy in Space
p.1

A Transition to Diffusionless Growth of Crystal Microstructure in Rapid Solidification
p.19

Grain Boundary Influence on the Electrical Properties of Tellurium Microstructure Ingots and Nanocluster Crystals
p.25

Formation of the Microstructure in a Rapid Directionally Solidified Immiscible Alloy
p.31

Microstructure Evolution in Rapidly Solidified Immiscible Alloys
p.37

Monotectic Growth: Unanswered Questions
p.45

Microstructures Observed during Directional Solidification along the Univariant Eutectic Reaction in a Ternary Al-Cu-Si Alloy
p.51

Eutectic Solidification of Ternary Al-Cu-Ag Alloys: Coupled Growth of α(Al) and Al₂Cu in Univariant Reaction
p.57

Solidification of Hypereutectic Thin Wall Ductile Cast Iron
p.63

HomeMaterials Science ForumMaterials Science Forum Vol. 508Microstructure Evolution in Rapidly Solidified...

Microstructure Evolution in Rapidly Solidified Immiscible Alloys

Abstract:

We prepared Al-Bi alloys with our new aerogel counter gravity casting facility and Al-Pb alloys by simple mould casting with variable cooling rates. By counter gravity casting, it is possible to have directional solidification with flat isotherms and without forced melt flow during the casting process. Both methods allow studying the nucleation rate in liquid-liquid decomposition. The most important result is that a separation between monotectic and hypermonotectic particles is possible by using suitable cooling rates. The difference of the frequency maxima is a function, depending on cooling rate and starting composition. By casting experiments with variable cooling rates, we found that the average particle diameter is a function of the cooling rate, according to the theory of Ratke and Zhao, but the nucleation rate is higher than assumed in their theory.