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Aging behavior of the extruded SiCp-reinforced AZ91 Mg alloy composite

Published online by Cambridge University Press:  22 November 2018

Hai Chang ,
Xiaoshi Hu ,
Xiaojun Wang ,
Junfeng Du  and
Libo Tong
Hai Chang
Affiliation:
National Center for Materials Service Safety, University of Science and Technology, Beijing 100083, People’s Republic of China
Xiaoshi Hu*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Xiaojun Wang
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Junfeng Du*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Libo Tong
Affiliation:
State Key Laboratory of Rare Earth Resources Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun 130022, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The effect of SiCp on the aging behavior of the extruded SiCp/AZ91 composite fabricated by stir casting was investigated in detail. The necklace-type distribution of the particles in the cast SiCp/AZ91 composite was destroyed, and the extrusion bands consisting of SiCp and small dynamic recrystallized grains formed aligning along the extrusion direction. Addition of SiCp could accelerate the aging kinetics of the AZ91 matrix because of the overlapped particle plastic zone. The improved particle distribution and refined grains caused by the recrystallization could affect the aging behavior of the SiCp/AZ91 composite. The Mg17A112 discontinuous precipitates preferred to nucleate at the SiC/Mg interfaces and the grain boundaries within the extrusion bands and then expanded into the particle-free region. Moreover, the promoted discontinuous precipitates would suppress the continuous intragranular precipitates with respect to the unreinforced AZ91 alloy.

Keywords

SiCp/AZ91 compositeextrusionaging treatmentMg17A112 precipitatesmicrostructuretensile properties
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 2 , 28 January 2019 , pp. 335 - 343
Copyright
Copyright © Materials Research Society 2018 

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