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Phase field modelling of microstructure evolution and ripening driven grain growth during cooling slope processing of A356 Al alloy

Das, Prosenjit and Dutta, Pradip (2016) Phase field modelling of microstructure evolution and ripening driven grain growth during cooling slope processing of A356 Al alloy. In: COMPUTATIONAL MATERIALS SCIENCE, 125 . pp. 8-19.

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Official URL: http://dx.doi.org/10.1016/j.commatsci.2016.08.022

Abstract

A phase field model is developed for simulation of microstructure evolution during semi solid slurry generation process of A356 aluminium alloy using a cooling slope. First, experiments are performed to evaluate the number of seeds required within the simulation domain to simulate near spherical microstructure formation, occurring during cooling slope processing of the melt. Subsequently, microstructure evolution is studied employing a phase field method. Simulations are performed to understand the effect of cooling rate and melt treatment in the form of grain refiner and modifier addition on the slurry microstructure. The results obtained from mesoscopic phase field simulations are grain size, grain density, degree of sphericity of the evolving primary Al phase and the amount of solid fraction present within the slurry at different time frames. The simulation is extended to predict the microstructure evolution during the post slurry generation isothermal holding stage, by feeding in the average particle size and the number of primary Al grains within the simulation domain, which are estimated from the simulated micrograph obtained at the end of slurry generation simulation. Results obtained from the simulation studies are validated against corresponding experimental observations. Insight into the cooling slope slurry generation technique is obtained from the numerical findings, which are found to be useful for process control during component development using a Rheo pressure die casting system. (C) 2016 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Depositing User: Id for Latest eprints
Date Deposited: 03 Dec 2016 06:33
Last Modified: 03 Dec 2016 06:33
URI: http://eprints.iisc.ac.in/id/eprint/55299

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