Estudio y obtención de una aleación liviana para la fabricación de un bloque de motor de combustión interna de dos tiempos

Abstract

In this project, the study and obtaining A356.0 aluminum alloy, suitable for manufacturing a prototype block internal combustion engine is performed. The physical and mechanical properties of the alloy A356.0, are influenced by the chemical composition and microstructural characteristics respectively. Mechanical properties, for example, tensile strength and ductility are influenced by; the secondary dendrite arms spacing (SDAS), grain size and shape, form the eutectic phase, shape and distribution of intermetallic phases. Controlling the microstructural characteristics of alloy A356.0 it is performed by, molten metal treatment, solidification process control and application of heat treatment T6. The procedure involves the use of a master alloy, the addition of a grain refiner agent (Al-5Ti-B) and eutectic phase modifier (99% purity strontium). Proper temperature control, degassing and solidification processes of molten metal and allows a fine equiaxed primary aluminum grain and a fine eutectic phase. The application of heat treatment T6, ensures Mg2Si precipitates smaller and better distributed in the aluminum matrix. The desirable microstructure is obtained by controlling the above processes, a positive influence on the improvement of tensile strength, ductility and toughness of the alloy A356.0.