Effect of Cooling Rate on the Microstructures and Mechanical Properties of Mg-Y Alloys

Goh Chwee Sim; Khin Sandar Tun; Xing He Tan; Chan Kwok Jimmy Weng; Kwok Wai Richard Onn; Manoj Gupta; Teck Kheng Lee

doi:10.4028/www.scientific.net/AMM.597.135

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 597Effect of Cooling Rate on the Microstructures and...

Effect of Cooling Rate on the Microstructures and Mechanical Properties of Mg-Y Alloys

Abstract:

Magnesium (Mg) alloys with 30 weight percentage (wt.%) of yttrium (Y) were gravity cast using copper mold and copper mold with air cooling. The results were benchmarked with Mg-30Y alloys produced using steel mold casting. It was found that the Mg-30Y alloys cast using the copper mold with air cooling exhibited the best mechanical properties, whereby the compression strength and the Vickers hardness value peak at 633 MPa and 137.6 HV respectively. Microstructural observations show that with increasing cooling rate, and hence increasing molten metal solidification rate, the dendrite structures are much finer due to enhanced nucleation rate. This is due to limited time for the dendrites to coarsen.

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Periodical:

Applied Mechanics and Materials (Volume 597)

Pages:

135-139

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.597.135

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Online since:

July 2014

Authors:

Goh Chwee Sim*, Khin Sandar Tun, Xing He Tan, Chan Kwok Jimmy Weng, Kwok Wai Richard Onn, Manoj Gupta, Teck Kheng Lee

Keywords:

Compressive Strength, Cooling Rate, Magnesium-Yttrium Alloys, Microstructure

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