354 aluminum cast alloy is widely used for the manufacture of complex parts in various fields such as automotive industry due to its light weight and high strength. However, the tensile properties of this alloy, like other Al-Si alloys, decline rapidly at the temperatures above 300℃.
Up to date, many researchers have carried out numerous studies to improve the microstructure and high-temperature tensile properties of Al-Si-Cu-Mg alloys, by micro additions of alloying elements such as Zr, Ni and Ce and heat treatments. However, no studies have focused on determining the optimum addition amounts of Zr, Ni and Ce and heat treatment process parameters to maximize the tensile properties of 354 alloy at 300℃.
Ri Wi Song, a researcher at the Faculty of Materials Science and Technology, has conducted a study to determine the optimum addition amounts of Zr, Ni and Ce and heat treatment process parameters for the maximum tensile properties at 300℃ of 354 alloy, using TOPSIS method and Taguchi method.
As a result, he has found that the optimum addition amounts and heat treatment process parameters are as follows: Zr 0.3%, Ni 0.2%, Ce 0.1%, SHT (solution heat treatment) temperature 510℃, SHT time 10h, aging temperature 180℃ and aging time 6h.
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