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Preparation and rheo-squeeze casting of semi-solid AZ91–2 wt% Ca magnesium alloy by gas bubbling process

Published online by Cambridge University Press:  13 March 2015

Yang Zhang ,
Guohua Wu ,
Wencai Liu ,
Liang Zhang ,
Song Pang  and
Wenjiang Ding
Yang Zhang
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Guohua Wu*
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Wencai Liu
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Liang Zhang
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Song Pang
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
Wenjiang Ding
Affiliation:
National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

In this study, semi-solid slurry of AZ91–2 wt% Ca (AZ91–2Ca) alloy was prepared by gas bubbling and shaped by rheo-squeeze casting process. The results indicate that fine semi-solid slurry of AZ91–2Ca alloy could be obtained by gas bubbling within 30 s, with primary α-Mg particles having an average diameter less than 50 μm and average shape factor higher than 0.7. With the decrease of pouring temperature from 599 to 590 °C, both tensile strength and elongation of rheo-squeeze casting AZ91–2Ca alloy first increased and then decreased. The rheo-squeeze casting AZ91–2Ca alloy sample prepared at pouring temperature of 596 °C exhibited the peak tensile strength and elongation. Compared with conventional squeeze casting, the improvement in mechanical properties of rheo-squeeze casting AZ91–2Ca alloy was mainly attributed to the grain refinement strengthening, including the refinement and spheroidization of primary α-Mg particles and the refinement in the residual melt.

Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 6 , 28 March 2015 , pp. 825 - 832
Copyright
Copyright © Materials Research Society 2015 

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