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A lot of elements of agricultural machines are made of Al-Si alloys. Hypoeutectic silumins are among the most popular casting alloys. They are used in a wide range of industrial applications, but their properties are continuously studied to improve the quality of cast products. Attempts are being made to improve the casting technology, refine the microstructure of cast products and enhance their functional properties. Those properties can be altered by cooling, directional solidifications, modification, heat processing and improved production technology. In practice, the properties of alloys are improved mainly through modification. The initial structure of AlSi9Mg alloy is composed of granular and acicular β phase, with α phase as matrix. The hard, irregular, often pointed β phase is responsible for the poor mechanical properties of said alloy. This composition is responsible for the alloy’s low strength parameters, and it limits the extent of practical applications. The properties of alloys may not only depend on the chemical composition, modifiers, but may also depend on the conditions of the modification process, which may include the modification time. The analysis of the influence of modifying components in connection with the parameters of the modification process can give wider possibilities of controlling the properties, and thus the use of the alloy. This study presents the results of modification time of an AlSi9Mg alloy with strontium, boron and titanium. The influence of the analyzed modification time on the tensile strength and elongation of silumin modified by Sr, Ti + B was presented in graphs. The used modification treatment time of a hypoeutectic AlSi9Mg alloy improved the alloy’s properties. The results of the tests show a change in the mechanical properties of tested alloy.

Eeffect of modification time on microstructure and tensile strength AlSi9Mg alloy with Sr, Ti and B additions using in agricultural machinery