Effect of SiC reinforcement particles on the grain density in a magnesium-based metal-matrix composite: modelling and experiment

Lelito, Janusz; Zak, Pawel L.; Shirzadi, Amir A.; Greer, A. Lindsay; Krajewski, Witold K.; Suchy, Jozef S.; Haberl, Katharina and Schumacher, Peter (2012). Effect of SiC reinforcement particles on the grain density in a magnesium-based metal-matrix composite: modelling and experiment. Acta Materialia, 60(6-7) pp. 2950–2958.

DOI: https://doi.org/10.1016/j.actamat.2012.01.058

Abstract

The aim in this work is to develop a numerical model capable of predicting the grain density in the Mg-based matrix phase of an AZ91/SiC composite, as a function of the diameter and total mass fraction of the embedded SiC particles. Based on earlier work in a range of alloy systems, we assume an exponential relationship between the grain density and the maximum supercooling during solidification. Analysis of data from cast samples with different thicknesses, and mass fractions and particle diameters of added SiC, permits conclusions to be drawn on the role of SiC in increasing grain density. By fitting the data, an empirical nucleation law is derived that can be used in a micro-macro model. Numerical simulations based on the model can predict the grain density of magnesium alloys containing SiC particles, using the diameter and mass fraction of the particles as inputs. These predictions are compared with measured data.

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About

• Item ORO ID
• 32907
• Item Type
• Journal Item
• ISSN
• 1359-6454
• Project Funding Details

• Funded Project Name	Project ID	Funding Body
  Not Set	Not Set	Marie Curie Foundation

• Extra Information
• “NOTICE: this is the author’s version of a work that was accepted for publication in Acta Materialia. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Acta Materialia, [VOL60, ISSUE6-7, (April 2012)] DOI 10.1016/j.actamat.2012.01.058”
• Keywords
• metal matrix composites (MMC); particulate reinforced composites; solidification; casting; modelling
• Academic Unit or School
• Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Copyright Holders
• © 2012 Acta Materialia Inc.
• Related URLs
• • http://www.sciencedirect.com/science/jou...(Other)
• Depositing User
• Amir Shirzadi