LU C X,WU H,MA H,et al. Spheroidization of primary silicon in hypereutectic Al-Si alloy by heat treatment[J]. Special Casting & Nonferrous Alloys,2024,44(3):372-376.
LU C X,WU H,MA H,et al. Spheroidization of primary silicon in hypereutectic Al-Si alloy by heat treatment[J]. Special Casting & Nonferrous Alloys,2024,44(3):372-376. DOI: 10.15980/j.tzzz.2024.03.015.
The modified hypereutectic Al-24Si alloy was subjected to solid state diffusion heating and semi-solid heating treatment to promote the homogenization and spheroidization of primary silicon, and the optimal process was determined to improve the properties. The results indicate that the optimal heating parameter of solid state diffusion is 540 ℃ for 12 h, and primary silicon is grown up and become passivated. The optimal parameter for semi-solid heating is 615 ℃ for 15 min, and morphology of primary silicon is significantly improved and spheroidized, where the shape factor can reach above 0.80.
关键词
过共晶铝硅合金初生Si固态扩散加热半固态加热球化
Keywords
Hypereutectic Al-Si AlloyPrimary SiliconSolid State Diffusion HeatingSemi-solid HeatingSpheroidize
LI Q L,ZHU Y Q,LI J B,et al.Influence of Yb and Al-Ti-B complex modification on microstructure and performance of hypereutectic Al-Si casting alloys[J].Rare Metal Materials and Engineering,2020,49(6):1 915-1 924.
ABEDI A,SHAHMIRI M,ESGANDARI B A,et al.Microstructural evolution during partial remelting of Al-Si alloys containing different amounts of magnesium[J].Journal of Materials Science & Technology,2013,29(10):971-978.
YAN G Y,MAO F,CHEN F,et al.Effect of homogenization annealing on microstructure, composition and mechanical properties of 7050/6009 bimetal slab[J].Transactions of Nonferrous Metals Society of China,2016,26(10): 2 532-2 541.