International Journal of Engineering Technology and Scientific Innovation
Submit Paper

Title:
INFLUENCE OF GRAIN SIZE AND SHAPE OF PHASES IN MECHANICAL RESPONSE LIGHTWEIGHT ALUMINUM ALLOYS

Authors:
Caluguillin J., Lema A., Oviedo F., Sotomayor O.

Abstract:
In this project, the study and obtaining A356.0 aluminum alloy, suitable for manufacturing a block for a combustion engine prototype is performed. The physical and mechanical properties of the alloy A356.0 are influenced by the chemical composition and microstructural characteristics respectively. Mechanical properties such as, tensile strength and ductility are influenced by secondary dendrite arms spacing (SDAS), grain size, form of the eutectic phase, shape and distribution of intermetallic phases. Controlling the microstructural characteristics of alloy A356.0 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 allows the production of 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. A desirable microstructure is obtained by making use of the proposed production process. A positive influence of the process on tensile strength, ductility and toughness of the alloy A356.0 has been achieved.

Download Full Text