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Effect of Holding Time on Microstructures of AZ91D Alloy by the Semi-Solid Thixo-Extruded Process

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Abstract:

The semi-solid thixo-extruded process of AZ91D magnesium alloy with 9 % plastic deformation was investigated. The effect of isothermal time on the thixo-extruded formability of AZ91D magnesium alloy was analyzed. The relationship between isothermal time and microstructure, mechanical property was also researched. The results showed that with increasing the isothermal time from zero to 60 min on 575 °C, the filling distance was increased firstly and then decreased, the solid volume fraction was decreased firstly and then increased, the tensile strength and elongation were also increased firstly and then decreased. However, the increasing isothermal time would lead to decrease of shape factor but the coarsening of particle size. When the isothermal time was 30 min, the solid volume fraction was lowest and the filling distance was greatly increased obviously.

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Periodical:

Advanced Materials Research (Volume 1088)

Pages:

191-194

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1088.191

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Online since:

February 2015

Authors:

Xiao Ping Zheng*, Ze Sheng Ji, Wei Wen Zhang, Ming Shao

Keywords:

AZ91D Alloy, Holding Time, Microstructure, Semi-Solid Extrusion

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© 2015 Trans Tech Publications Ltd. All Rights Reserved

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