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Materials 2016, 9(12), 964; doi:10.3390/ma9120964

Effect of Pre-Oxidation Treatment of Nano-SiC Particulates on Microstructure and Mechanical Properties of SiC/Mg-8Al-1Sn Composites Fabricated by Powder Metallurgy Combined with Hot Extrusion

1
State Key Laboratory of Automotive Simulation and Control, Key Laboratory of Automobile Materials of Ministry of Education & School of Materials Science and Engineering, Nanling Campus, Jilin University, No. 5988 Renmin Street, Changchun 130025, China
2
Center of Analytical and Testing, Beihua University, No. 3999 Binjiang East Road, Jilin 132013, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Douglas Ivey
Received: 23 September 2016 / Revised: 17 November 2016 / Accepted: 23 November 2016 / Published: 26 November 2016
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Abstract

Nano-SiC particulates (n-SiCp) reinforced Mg-8Al-1Sn (AT81) composites with different pre-oxidation parameters were fabricated by powder metallurgy (P/M) process combined with hot extrusion. The effects of pre-oxidization treatment of n-SiCp on the microstructure and tensile properties of 0.5 vol % n-SiCp/AT81 composites were investigated accordingly. The distribution of n-SiCp with different pre-oxidation parameters was homogeneous in the composites. Moreover, it was found that a thin MgAl2O4 layer formed at the interface when the n-SiCp were pre-oxidized at 1073 K for 2 h, while the MgAl2O4 layer became much thicker with pre-oxidization temperature increasing to 1273 K for 2 h. After an appropriate pre-oxidization treatment of n-SiCp at 1073 K for 2 h, the as-extruded 0.5 vol % n-SiCp/AT81 composites exhibited an enhanced strength. It was found that the yield strength (YS) and ultimate tensile strength (UTS) increased from 168 MPa and 311 MPa to 255 MPa and 393 MPa compared with the as-extruded AT81 alloy, reflecting 51.8% and 26.4% increments, respectively. The improvement of mechanical properties should be mainly attributed to the grain refinement and homogeneous distribution of n-SiCp in the composites. Moreover, a well-bonded interface and the formation of an appropriate amount of interfacial product (MgAl2O4) benefited the material’s mechanical properties. View Full-Text
Keywords: magnesium; nano-SiC particulates; pre-oxidation parameters; powder metallurgy; tensile properties magnesium; nano-SiC particulates; pre-oxidation parameters; powder metallurgy; tensile properties
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MDPI and ACS Style

Li, C.-P.; Wang, Z.-G.; Zha, M.; Wang, C.; Yu, H.-C.; Wang, H.-Y.; Jiang, Q.-C. Effect of Pre-Oxidation Treatment of Nano-SiC Particulates on Microstructure and Mechanical Properties of SiC/Mg-8Al-1Sn Composites Fabricated by Powder Metallurgy Combined with Hot Extrusion. Materials 2016, 9, 964.

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