Effect of Alloying on the Grinding Performance of Al-18 wt.% Si Alloy

Author of the article:TANG Ziyang, LUO Xi, LIAO Rui, LI Xiaosong

Author's Workplace：School of Energy and Electrical Engineering, Hunan Institute of Science and Technology, Yueyang 414000, China

Key Words：Al-18 wt.% Si alloy; alloying; grinding force; roughness

Abstract：The coarse silicon phase in the microstructure of hypereutectic Al-Si alloys deteriorates their processingperformance. Improving the processing performance of hypereutectic Al-Si alloys is highly important for industrialapplication of hypereutectic Al-Si alloys. The effect of alloying on the grinding performance of the Al-18 wt.% Si alloy wasstudied via precision grinding tests. Results show that alloying has a refining effect on the microstructure of the Al-18 wt.% Sialloy. Compared with the original alloy, the alloy containing 4 wt.% Cu and 1 wt.% Mg has the smoothest grinding surface,with a roughness reduction of 70%. Compared with the original alloy, the 4 wt.% Cu- and 2 wt.% Zn-containing alloyshave significantly lower grinding forces and specific energies, with decreases of 50.9%, 54.8%, and 46.6%, respectively.The alloy with 4 wt.% Cu and 2 wt.% Bi and the alloy with 4 wt.% Cu and 2 wt.% Zn have the best surface morphology.Alloying significantly improves the grinding performance of the Al-18 wt.% Si alloy.