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The Effect of Sintering Temperature to the Microstructure and Properties of AZ91 Magnesium Alloy by Powder Metallurgy

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Abstract:

AZ91 magnesium alloy was fabricated by powder metallurgy. The effects of sintering temperature on the relative density, hardness and tensile strength were investigated. The microstructure of the material was observed by scanning electron microscopy (SEM) and Energy Disperse Spectroscopy (EDS). The study found that the best sintering temperature is 550°C under the vacuum hotpressing, and at this sintering temperature the relative density can reach to 98.3%. SEM and EDS show that the sintering microstructure of the alloy is composed of α-Mg solid solution and the second phase β-Mg17Al12. Under the 550°C sintering temperature, Volume diffusion is the mainly sintering form, and produced more β-Mg17Al12 which is dispersively distributed on the grain boundary, and improves the hardness of alloy by second-phase strength.

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Periodical:

Applied Mechanics and Materials (Volume 377)

Pages:

250-254

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.377.250

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Online since:

August 2013

Authors:

Ya Jun Zhou, Ai Yun Jiang, Jian Xiu Liu

Keywords:

AZ91 Magnesium Alloys, Microstructure, Powder Metallurgy, Property, Sintering Temperature

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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