A Study on the Microstructure Change with Modification and Cast-forging in Hypereutectic Al-Si Alloys

Chemical modification of morphology of Mg2Si phase in hypereutectic aluminium–silicon–magnesium alloys

“…This microstructure is responsible for the alloy's outstanding wear resistance, low thermal expansion, high thermal conductivity, and good elevated temperature strength and hardness. 1,7 However, proper control of the size and distribution of the primary Si particles in the microstructure is of paramount importance for attaining these desirable properties, and despite the many efforts that have been dedicated to achieving this goal, [8][9][10][11][12] it is still sometimes difficult to control the primary Si particle size and distribution. Recent investigations have indicated that hypereutectic Al-Si-Mg alloys with Mg levels in excess of 2% exhibit a microstructure in which the Si particles are inherently refined and well distributed.…”

Effect of Mg and Sr Additions on the Microstructure, Mechanical Properties and Reciprocating Wear Characteristics of Hypereutectic Al-14Si Alloy

“…Due to the favorable effects of solid solution strengthening and precipitation hardening, certain alloying addition can improve the mechanical and wear properties of hyper eutectic Al-Si alloys [2]. Excellent wear resistance, low thermal expansion, high thermal conductivity and good hardness are the result of uniformly distributed eutectic Si in the aluminium matrix [3][4][5].Highly refined and well distributed Si particles are seen in the microstructure of hyper eutectic Al-Si-Mg alloys with Mg levels in excess of 1% [6]. By precipitation hardening treatment, the mechanical properties of Al-Si-Mg alloys are greatly enhanced due the precipitation of Mg 2 Si particles [7,8].…”