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Journal of Materials - Volume 2014 2014, Article ID 657647, 18 pages -

Research Article

Mechanical and Industrial Engineering Department, Concordia University, 1455 de Maisonneuve Boulevard West, Montreal, QC, Canada H3G 1M8

Industrial Engineering Department, The Hashemite University, P.O. Box 330127, Zarqa 13115, Jordan

Renewable Energy & Advanced Materials Research Lab, International University of Rabat, Technopolis, 11 100 Sala el Jadida, Morocco

Received 28 November 2013; Revised 7 January 2014; Accepted 10 January 2014; Published 3 March 2014

Academic Editor: Necmettin Maraşlı

Copyright © 2014 Md. Imran Khan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of cooling rate on microstructure and microsegregation of three commercially important magnesium alloys was investigated using Wedge V-shaped castings of AZ91D, AM60B, and AE44 alloys. Thermocouples were distributed to measure the cooling rate at six different locations of the wedge casts. Solute redistribution profiles were drawn based on the chemical composition analysis obtained by EDS-WDS analysis. Microstructural and morphological features such as dendrite arm spacing and secondary phase particle size were analyzed using both optical and scanning electron microscopes. Dendritic arm spacing and secondary phase particle size showed an increasing trend with decreasing cooling rate for the three alloys. Area percentage of secondary phase particles decreased with decreasing cooling rate for AE44 alloy. The trend was different for AZ91D and AM60B alloys, for both alloys, area percentage of β-Mg17Al12 increased with decreasing cooling rate up to location 4 and then decreased slightly. The tendency for microsegregation was more severe at slower cooling rates, possibly due to prolonged back diffusion. At slower cooling rate, the minimum concentration of aluminum at the dendritic core was lower compared to faster cooled locations. The segregation deviation parameter and the partition coefficient were calculated from the experimentally obtained data.





Autor: Md. Imran Khan, Ahmad O. Mostafa, Mohammad Aljarrah, Elhachmi Essadiqi, and Mamoun Medraj

Fuente: https://www.hindawi.com/



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