Effect of porosity and interface structures on thermal and mechanical properties of SiCp/6061Al composites with high volume fraction of SiC

2019 ◽  
Vol 29 (5) ◽  
pp. 941-949 ◽  
Author(s):  
Yu HONG ◽  
Wu-jie WANG ◽  
Jia-qin LIU ◽  
Wen-ming TANG ◽  
Yu-cheng WU
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
High Volume ◽  
High Volume Fraction ◽  
Thermal And Mechanical Properties ◽  
Interface Structures

scholarly journals Enhanced Strength and Ductility in Magnesium Matrix Composites Reinforced by a High Volume Fraction of Nano- and Submicron-Sized SiC Particles Produced by Mechanical Milling and Hot Extrusion

Materials ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3445 ◽  
Author(s):  
Kamrani ◽  
Hübler ◽  
Ghasemi ◽  
Fleck
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Mechanical Milling ◽  
Volume Fraction ◽  
Energy Dispersive Spectrometer ◽  
High Volume ◽  
High Volume Fraction ◽  
Sic Particles ◽  
Significant Difference ◽  
Strength And Ductility

In the present study, Mg nanocomposites with a high volume fraction (10 vol %) of SiC particles were fabricated by two approaches: mechanical milling and mixing, followed by the powder consolidation steps, including isostatic cold pressing, sintering, and extrusion. A uniform distribution of the high content SiC particles in a fully dense Mg matrix with ultrafine microstructure was successfully achieved in the mechanically milled composites. The effect of nano- and submicron-sized SiC particles on the microstructure and mechanical properties of the nanocomposites was evaluated. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectrometer (EDS), and X-ray diffractometry (XRD) were used to characterize microstructures of the milled and mixed composites. Mechanical behavior of the Mg composites was studied under nanoindentation and compressive loading to understand the effects the microstructural modification on the strength and ductility of the Mg/SiC composites. The mechanical properties of the composites showed a significant difference regarding the size and distribution of SiC particles in the Mg matrix. The enhanced strength and superior ductility achieved in the mechanically milled Mg composites are mainly ascribed to the effective load transfer between matrix and SiC particles, grain refinement of the matrix, and strengthening effects of the nano- and submicron-sized SiC particles.

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