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Dependence of microstructure characteristics and mechanical properties on nanosize SiCp contents in Mg–9Al matrix composites fabricated by ultrasonic-assisted semisolid powder hot pressing

Published online by Cambridge University Press:  21 June 2018

Gang Li ,
Ming Li ,
Hongxia Wang ,
Zengyao Zhang ,
Weili Cheng ,
Wei Liang  and
Changjiang Zhang
Gang Li
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Ming Li
Affiliation:
Southwest Technology and Engineering Research Institute, Precision Forming Center, Chongqing 400039, People’s Republic of 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
Zengyao Zhang
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, 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
Wei Liang
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
Changjiang Zhang
Affiliation:
Shanxi Key Laboratory of Advanced Magnesium Based Materials, College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
*
a)Address all correspondence to this author. e-mail: wanghxia1217@163.com
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Abstract

Nanosize SiCp (n-SiCp) reinforced Mg–9Al matrix composites (Mg–9Al–xSiC, x = 2.5, 5, 7.5, 10 wt%) with nearly full densification are fabricated by the semisolid powder hot pressing technique assisted with ultrasonic. The effect of SiC nanoparticle contents on microstructures and mechanical properties of the composites is systematically investigated. Grain size and density of Mg–9Al–xSiC composites and morphology of bonding interfacial between the n-SiCp and matrix are found to be greatly dependent on the n-SiCp contents, resulting in the strength and ductility of the composites increase first and then decrease as the increase of n-SiCp contents. As the SiCp content increasing to 7.5 wt%, superior mechanical properties with the yield strength of 191 MPa, ultimate tensile strength of 248 MPa, and elongation to failure of 5.3% are achieved. The improved mechanical properties could be attributed to grain boundary strengthening, Orowan strengthening, and load transfer strengthening.

Keywords

magnesium matrix compositessemisolid powder hot pressingmicrostructuremechanical propertiesstrengthening mechanism
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 18 , 28 September 2018 , pp. 2689 - 2699
Copyright
Copyright © Materials Research Society 2018 

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