Mathematical modeling of microshrinkage formation during solidification of A356 alloy castings

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dc.contributor El-Kaddah, N.
dc.contributor Weaver, Mark Lovell
dc.contributor Jordon, J. Brian
dc.contributor.advisor Nastac, Laurentiu Patel, Akash H. 2017-03-01T16:48:04Z 2017-03-01T16:48:04Z 2013
dc.identifier.other u0015_0000001_0001271
dc.identifier.other Patel_alatus_0004M_11474
dc.description Electronic Thesis or Dissertation
dc.description.abstract Significant efforts have been made by materials scientists and metallurgists to understand the underlying physics involved in solidification of aluminum alloys to predict a variety of casting defects. Shrinkage porosity is one of the most important types of casting defects. Addressing porosity has been a formidable challenge due to many contributing (and interacting) phenomena responsible for its formation and growth. Shrinkage porosity occurs by nucleation and growth phenomena. Very few previous models for shrinkage prediction consider the pore formation based on a nucleation and growth basis. Several models that can predict micro shrinkage in castings were revised in detail. The main purpose of this study was to develop a comprehensive model which can predict micro-shrinkage pores that are forming during solidification of A356 castings. The model utilizes a stochastic approach and takes into consideration the Niyama criterion as well as the nucleation potential for formation of pores. Therefore, it can predict the random nature of pore formation during casting solidification. Correlations between the predictions and the pore amount were developed. For this model, literature validation was provided for an A356 alloy plate casting. Further validation was performed for a bar geometry cast in a silica sand mold. The model predictions match reasonably well with the experimental pore distribution profile.
dc.format.extent 68 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated.
dc.subject.other Engineering
dc.title Mathematical modeling of microshrinkage formation during solidification of A356 alloy castings
dc.type thesis
dc.type text University of Alabama. Dept. of Metallurgical and Materials Engineering Metallurgical Engineering The University of Alabama master's M.S.

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