RUSZ Stanislav VSB - Technical University of Ostrava

Spoluautoři ČÍŽEK Lubomír, TAŃSKI Tomasz, DONIČ Tibor, SALAJKA Michal, TYLŠAR Stanislav, KEDROŇ Jan

At the contemporary stage of the development of the engineering thought, and the product technology itself, material engineering has entered the period of new possibilities of designing and manufacturing of elements, introducing new methods of melting, casting, forming, and heat treatment of the casting materials, finding wider and wider applications in many industry branches. Engineers whose employment calls for significant expenditure of labour and costs strive to reduce material consumption. Therefore the development of engineering aims at designs optimizing, reducing dimensions, weight, and extending. Increasing the share of light structural materials in structures of airplanes or vehicles leads to reduction of environmental load. Magnesium alloys also play an important role among these materials. Aluminium and zinc are used the most frequently for alloying of magnesium. Small concentrations of manganese in the Mg-Al-Zn alloys improve resistance of these alloys to corrosion. Alloys AZ91 have been investigated very well and they found many applications in automotive industry. Mg-Al-Si alloys improve resistance to creep at temperatures up to 150 ºC, they have good plasticity, ultimate strength and yield strength. They are used in crank cases of air-cooled automobile engines, for production of clutch pistons and blade stators. Recently, however, increases also utilization of formed magnesium alloys namely application of SPD methods. From this reason the presented work deals results of metallographic analysis, microanalysis and hardness measurements above presented magnesium alloys. Knowledge of structure and mechanical properties is very important for complex evaluation of magnesium alloys for its next application in SPD processing. SPD methods application for magnesium alloys in as cast state was practically impossible so that the heat treatment before processing of those is advisable and it will be of aim of study in the next work. Research work dealing with the influence of the initial state of structure of the AZ31 alloy on the final refinement by process SPD. The paper analyse the effect of heat treatment of initial structure on the final properties of the alloy AZ31 after the forming process.

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