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

Abstract:

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.

• Periodical: Materials Science Forum (Volume 898)
• Pages: 104-110
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.898.104
• Online since: June 2017
• Authors: Peng Qi, Bo Long Li*, Wen Jian Lv, Tong Bo Wang, Zuo-Ren Nie
• Keywords: Electromagnetic Stirring, Fracture, Microstructure, Semi-Solid, Tensile Properties

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