Effects of microscale phenomena and density in modelling macrosegregation

Suresh Sundarraj, Vaughan R Voller

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations

Abstract

Segregation phenomena in binary alloys occur at two distinct length scales; macrosegregation, driven by flow, at the scale of the process and microsegregation, driven by mass diffusion, at the scale of the dendrite arms. In this paper a dual scale model of segregation, which accounts for and couples both scales, is presented and applied in the prediction of the shrinkage driven, inverse, chill face segregation which occurs in the uni-directional casting of Al-Cu alloys. The central focus of the work is to access the impact on inverse segregation of (i) the microscale treatment (in particular the handling of the solid sate mass diffusion) and (ii) the choice of density models. The major conclusions are that (i) a limiting Scheil treatment is often sufficient to account for microsegregation effects and (ii) density models, previously presented in the literature, lead to dramatically different predictions in the levels of inverse segregation.

Original languageEnglish (US)
Title of host publicationProc 1995 7 Conf Model Casting Welding Adv Solid Process
EditorsMark Cross, John Campbell
PublisherMinerals, Metals & Materials Soc (TMS)
Pages131-138
Number of pages8
StatePublished - Dec 1 1995
EventProceedings of the 1995 7th Conference on Modeling of Casting, Welding and Advanced Solidification Processes - London, UK
Duration: Sep 10 1995Sep 15 1995

Other

OtherProceedings of the 1995 7th Conference on Modeling of Casting, Welding and Advanced Solidification Processes
CityLondon, UK
Period9/10/959/15/95

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    Sundarraj, S., & Voller, V. R. (1995). Effects of microscale phenomena and density in modelling macrosegregation. In M. Cross, & J. Campbell (Eds.), Proc 1995 7 Conf Model Casting Welding Adv Solid Process (pp. 131-138). Minerals, Metals & Materials Soc (TMS).