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Effect of SiC nanoparticles addition on the microstructures and mechanical properties of ECAPed Mg9Al–1Si alloy

Published online by Cambridge University Press:  09 January 2017

Wanhua Wang ,
Hongxia Wang ,
Yiming Liu ,
Huihui Nie  and
Weili Cheng
Wanhua Wang
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; and Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
Hongxia Wang*
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; and Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
Yiming Liu
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; and Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
Huihui Nie
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; and Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
Weili Cheng
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China; and Key Laboratory of Interface Science and Engineering in Advanced Materials, Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
*
a) Address all correspondence to this author. e-mail: wanghxia1217@163.com
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Abstract

This study investigated the effects of 1 wt% SiC nanoparticles addition on the microstructures and mechanical properties of Mg9Al–1Si (wt%) alloy subjected to equal channel angular pressing (ECAP). Results showed that addition of SiC nanoparticles could refine matrix grain, Mg17Al12 and Mg2Si phase of as-cast alloy, but the Mg17Al12 phase still exhibited network structure and the morphology of Mg2Si phase was still Chinese-script type. During the ECAP process, network Mg17Al12 and Chinese-script shaped Mg2Si phases were partially broken down into fine particles (∼10 µm) and much finer particles (∼2 µm) respectively. In particular, these Mg17Al12 and Mg2Si particles were uniform distribution in ECAPed Mg9Al–1Si–1SiC composite. The well-distributed particles and the existence of SiC nanoparticles could promote the formation of fine DRXed grains through enhanced grain boundary pinning. During tensile testing at room temperature, ECAPed Mg9Al–1Si–1SiC composite exhibit optimal mechanical properties, the ultimate tensile strength and elongation to failure were reached to 255 MPa and 7.9%, respectively. Furthermore, at elevated temperature of 150 °C, the tensile strength and elongation to failure were considerably increased compared to an ECAPed, SiC-free Mg9Al–1Si alloy.

Keywords

compositeECAPSiC nanoparticlesmicrostructuremechanical properties
Type
Articles
Information
Journal of Materials Research , Volume 32 , Issue 3 , 14 February 2017 , pp. 615 - 623
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Copyright
Copyright © Materials Research Society 2017 

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Footnotes

Contributing Editor: Jürgen Eckert

References

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