scholarly journals Low-temperature densification, microstructures and mechanical properties of ZrB2–SiC composites with Cr3C2 additives

2018 ◽  
Vol 126 (3) ◽  
pp. 156-162 ◽  
Author(s):  
Shuqi GUO
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Microstructures And Mechanical Properties ◽  
Sic Composites

Effects of Electromagnetic Stirring Frequency on the Microstructure and Mechanical Properties of Al-7Si-0.42 Mg-0.1Cu Alloy by Semi-Solid Processing

2017 ◽  
Vol 898 ◽  
pp. 104-110 ◽  
Author(s):  
Peng Qi ◽  
Bo Long Li ◽  
Wen Jian Lv ◽  
Tong Bo Wang ◽  
Zuo Ren Nie
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Low Temperature ◽  
Fracture Morphology ◽  
Electromagnetic Stirring ◽  
Spherical Morphology ◽  
Microstructure And Mechanical Properties ◽  
Microstructures And Mechanical Properties ◽  
Semi Solid ◽  
Dendritic Structures

The effect of the different electromagnetic stirring frequency after low temperature pouring on microstructures and mechanical properties of Al-7Si-0.42 Mg-0.1Cu alloys was studied. It was found that the primary α-Al becomes smaller and tended to be spherical morphology, and the particles were uniformly distributed after electromagnetic stirring. The tensile strength of alloys improved gradually from 193.02 MPa to 212.54 MPa, and the elongation increased from 3.73% to 6.67% when the stirring frequency was 10 Hz. From the fracture morphology, the fracture for alloy stirred at frequency of 10 Hz showed more dimples than that without stirring. When the stirring frequency increased to 15 Hz, the microstructures of primary α-Al appeared to be dendritic structures, and the grains became coarse. As a result, the 10 Hz was the best electromagnetic stirring frequency.

scholarly journals Effect of Polycarbosilane Content on Microstructures and Mechanical Properties of Short-Carbon-Fibre-Reinforced SiC Composites

2006 ◽  
Vol 15 (3) ◽  
pp. 096369350601500
Author(s):  
Xiulan He ◽  
Yuguang Dai ◽  
Yinggui Guo ◽  
Yu Zhou ◽  
Dechang Jia
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
Liquid Phase Sintering ◽  
Carbon Fibres ◽  
Pyrolysis Products ◽  
Precursor Polymer ◽  
Microstructures And Mechanical Properties ◽  
Sic Composites ◽  
Short Carbon

Short-carbon-fibre-reinforced SiC composites were prepared by precursor pyrolysis-hot pressing with Polycarbosilane (PCS) as precursor polymer and MgO-Al2O3-Y2O3 as sintering additives. The effects of PCS content on microstructures and mechanical properties of the composites were investigated. The results showed that, the composites could be densified at a relatively low temperature of 1800? via the liquid-phase-sintering mechanism and the highest mechanical property was obtained for the composites with 20wt. % PCS content. During sintering, Y2O3, Al2O3 reacted with the pyrolysis products from PCS and formed amorphous interphase, which was benefit of densification of the composites and avoidance of degeneration of the carbon fibres. The nano PCS-derived SiC almost lied on the surface of the particle of starting powder β-SiC, which could play a role of filling up the void and improve the relative density of the composites.

Sign in / Sign up

Export Citation Format

Share Document