Distribution of SiC particles in semisolid electromagnetic-mechanical stir-casting Al-SiC composite

China Foundry, Sep 2018

The distribution of SiC particles in Al-SiC composite can greatly influence the mechanical performances of Al-SiC composite. To realize the homogeneous distribution of SiC particles in stir-casting Al-SiC composite, semisolid stir casting of Al-4.25vol.%SiC composite was conducted using a special electromagnetic-mechanical stirring equipment made by our team, in which there are three uniformly-distributed blades with a horizontal tilt angle of 25 ° to mechanically raise the SiC particles by creating an upward movement of slurry under electromagnetic stirring. The microstructure of the as-cast Al-SiC composites was observed by Scanning Electron Mcroscopy (SEM). The volume fraction of SiC particles was measured by image analysis using the Quantimet 520 Image Processing and Analysis System. The tensile strength of the Al-4.25vol.%SiC composites was measured by tensile testing. Results show that the Al-4.25vol.%SiC composites with the homogeneous distrbutin of SiC particles can be obtained by the electromagnetic-mechanical stirring casting with the speed of 300 and 600 r·min−1 at 620 °C. The differences between the volume fraction of SiC particles at the top of ingot and that at the bottom are both ~0.04vol.% with the stirring speed of 300 and 600 r·min−1, which are so small that the distribution of SiC particles can be seen as the homogeneous. The tensile strength of the Al matrix is enhanced by 51.2% due to the uniformly distributed SiC particles. The porosity of the composite mainly results from the solidification shrinkage of slurry and it is less than 0.04vol.%.

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Distribution of SiC particles in semisolid electromagnetic-mechanical stir-casting Al-SiC composite

China Foundry September 2018, Volume 15, Issue 5, pp 351–357 | Cite as Distribution of SiC particles in semisolid electromagnetic-mechanical stir-casting Al-SiC composite AuthorsAuthors and affiliations Yun-hui DuPeng ZhangWei-yi ZhangYu-jie Wang Research & Development First Online: 22 September 2018 Received: 13 July 2018 Accepted: 05 August 2018 Abstract The distribution of SiC particles in Al-SiC composite can greatly influence the mechanical performances of Al-SiC composite. To realize the homogeneous distribution of SiC particles in stir-casting Al-SiC composite, semisolid stir casting of Al-4.25vol.%SiC composite was conducted using a special electromagnetic-mechanical stirring equipment made by our team, in which there are three uniformly-distributed blades with a horizontal tilt angle of 25 ° to mechanically raise the SiC particles by creating an upward movement of slurry under electromagnetic stirring. The microstructure of the as-cast Al-SiC composites was observed by Scanning Electron Mcroscopy (SEM). The volume fraction of SiC particles was measured by image analysis using the Quantimet 520 Image Processing and Analysis System. The tensile strength of the Al-4.25vol.%SiC composites was measured by tensile testing. Results show that the Al-4.25vol.%SiC composites with the homogeneous distrbutin of SiC particles can be obtained by the electromagnetic-mechanical stirring casting with the speed of 300 and 600 r·min−1 at 620 °C. The differences between the volume fraction of SiC particles at the top of ingot and that at the bottom are both ~0.04vol.% with the stirring speed of 300 and 600 r·min−1, which are so small that the distribution of SiC particles can be seen as the homogeneous. The tensile strength of the Al matrix is enhanced by 51.2% due to the uniformly distributed SiC particles. The porosity of the composite mainly results from the solidification shrinkage of slurry and it is less than 0.04vol.%. Key wordsAl-SiC composite stir casting particle distribution microstructure performance  Yun-hui Du Female, born in 1969, professor. She has been working in the field of composites. Her research focuses on new materials and new technologies. Her academic research has lead to the publication of more than 80 papers. CLC numbersTG146.21  Download to read the full article text References [1] Xie B, Wang X G, Hua X H, et al. Process and Performance of β-SiCp/Al Prepared by Bottom-vacuum Pressureless Infiltration. Rare Metal Mat. Eng., 2014, 43(9): 2089–2094.CrossRefGoogle Scholar [2] Mosleh-Shirazi S, Akhlaghi F, Li D Y. Effect of SiC Content on Dry Sliding Wear, Corrosion and Corrosive Wear of Al/SiC Nanocomposites. Trans. Nonferrous Met. Soc. China, 2016, 26(7): 1801–1808.CrossRefGoogle Scholar [3] Khodabakhshi F, Gerlich A P, Švec P. 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Yun-hui Du, Peng Zhang, Wei-yi Zhang, Yu-jie Wang. Distribution of SiC particles in semisolid electromagnetic-mechanical stir-casting Al-SiC composite, China Foundry, 2018, 351-357, DOI: 10.1007/s41230-018-8086-2