Multi-scale modeling of dendritic alloy solidification [Elektronische Ressource] / vorgelegt von Johannes Dagner

Johannes Dagner

Description

Multi-scale Modeling of DendriticAlloy SolidificationDer Technischen Fakultat¨ derUniversitat¨ Erlangen-Nurn¨ bergzur Erlangung des GradesDOKTOR-INGENIEURvorgelegt vonJohannes Franz DagnerErlangen 2009Als Dissertation genehmigt vonder Technischen Fakultat der¨Universitat¨ Erlangen-Nurn¨ bergTag der Einreichung: 27.06 2008Tag der Promotion: 18.11 2008Dekan: Prof. Dr.-Ing. habil. J. HuberBerichterstatter: Prof. Dr. Dr. h.c. G. Muller¨Prof. Dr. Dr. h.c. L. RatkeTo my ParentsSolidification of metallic melts is one of the most important pro-cesses in material science. The microstructure, which is formed dur-ing freezing, determines the mechanical properties of the final productlargely. Many physical phenomena influence the solidification processand hence the resulting microstructure. One important parameter isinfluenceofmeltflow,whichmaymodifyheatandspeciestransportona large range of length- and time-scales. On the micro-scale, it influ-ences the concentration field around a growing dendrite, changing itsgrowth kinetics and interaction with neighbors. On the macro-scale,convection can cause concentration changes inside the sample.Numericalmodelingofsolidificationprocessesshouldbeabletotreatthese multi-scale phenomena. In this work, such a multi-scale model,implemented in the software package CrysMAS, is presented.

Informations

• Publié par: friedrich-alexander-universitat_erlangen-nurnberg
• Publié le: 01 janvier 2009
• Nombre de lectures: 10
• Langue: English
• Poids de l'ouvrage: 19 Mo

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