Abstract
Abstract The present work aims to research the treatment processing of magnesium reinforced with 1 μmsilicon carbide particle (SiCp) using stir casting combined by ultrasonic vibration. Present studies have been done on six different materials: (a) AZ31B alloy without particles, (b) 5 vol.% SiCp/AZ31B composites fabricated with different semi-solid stirring time (5 min, 10 min, 15 min and 20 min), (c) composite with 20 vol.% SiCp. The effects of 1 μm/SiCp pretreatment and stirring time on microstructure and interfacial wettability as well as mechanical properties of the materials were confirmed. Both short and long stirring time for the particle dispersion brought particle agglomeration. Results of SEM microstructure and tensile properties exhibited that the optimal stirring parameters of 625 °C/1500 rpm/15 min are exploited, and 20 vol.% SiCp/AZ31B composite was fabricated by the optimal stirring parameters. The application of optimal stirring parameters for the treatment resulted in homogeneous particle distribution. The addition of SiCp leads to a reduced matrix grain, and 20 vol.% SiCp/AZ31B composite showed smaller grain size than. 5 vol.% SiCp/AZ31B composite. The interface between SiCp and matrix is clear and interfacial wettability well. Tensile test results show that with increasing SiCp content, strengths increase while ductility decreases.
Highlights
The present work aims to research the treatment processing of magnesium reinforced with 1 μm silicon carbide particle (SiCp) using stir casting combined by ultrasonic vibration
Results of scanning electron microscopy (SEM) microstructure and tensile properties exhibited that the optimal stirring parameters of 625 °C/1500 rpm/15 min are exploited, and 20 vol.% SiCp/AZ31B composite was fabricated by the optimal stirring parameters
Composites were investigated, and the main conclusions can be drawn as follows: 1. Both too short and too long stirring time for the SiCp/AZ31B composite fabricated by stirring cast method resulted in nonhomogeneous particle distribution
Summary
Abstract: The present work aims to research the treatment processing of magnesium reinforced with 1 μm silicon carbide particle (SiCp) using stir casting combined by ultrasonic vibration. The reasons are attributed to its simple process flow, easy operation, high yields and low cost, and is considered to be the best choice for fabrication of composites with high content SiCp. It is well known that many factors influence microstructure and mechanical properties of particle reinforced MMCs. B.N. Sahoo et al [11] synthesized fine (TiCTiB2) reinforced magnesium matrix in-situ composites through novel stir casting process. Compared to conventional stir-casting technique, there are limited studies using stir casting combined by ultrasonic vibration to fabricate submicron SiCp reinforced MMCs. In this study, an optimized stirring time for producing 5 vol.% SiCp/AZ31B composite was confirmed to obtain MMCs with homogeneous microstructure and good mechanical properties. The main aims in this process are synthesizing the composite with high content SiCp and understanding the influences of particles parameters on microstructure and mechanical properties
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