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2 2010

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ECAP methods application on selected non-ferrous metals and alloys

100%

Rusz S. , Čížek L. , Dobrzański L. , Tylšar S. , Kedroň J.

2010

tom Vol. 43, nr 2

69-76

Purpose: Paper presents results of investigations mechanical properties and microstructure samples selected nonferrous metals after ECAP. These properties and microstructure are influenced by technological factors during application ECAP method. Design/methodology/approach: The sample bars were plastically deformed during the ECAP process. The methods of the light microscopy and the hardness test for evaluation of mechanical properties and microstructure were used. Findings: Measurement of micro-hardness shows an increase value after application higher number of passes in agreement with ultra high fine grain occurrence. The method determines the dependencies of force on the route during the ECAP process. Research limitations/implications: Achieved hardness and microstructure characteristics will be determined by new research. Practical implications: The results may be utilized for a relation between structure and properties of the investigated materials in future process of manufacturing. Originality/value: These results contribute to complex evaluation of properties new nonferrous metals after application ECAP method. The results of this paper are determined for research workers deal by the process severe plastic deformation.

Structure characteristic of modify magnesium alloy MgAl8MnCa

86%

Cížek L. , Kedroň J. , Tylšar S. , Blahož O. , Prażmowski M. , Bański R.

2010

tom z. 97

13-14

Magnesium alloys has been used for a wide variety of applications, namely from the reason of their low density and high strength-to-weight ratio. Low inertia, which results from its low density, is advantageous in rapidly moving parts, for example automobile wheels and other automobile parts [1-2]. The basic magnesium alloys include ones which contain manganese, aluminium, zinc and other elements which allow obtaining suitable properties. Scope of utilisation of foundry magnesium alloys is continuously being extended, so if we want to operate as competitive producers, it is necessary to investigate very actively properties of individual alloys, optimise their chemical composition, study issues of their metallurgical preparation, verify experimentally their casting properties and conditions of successful casting of castings by individual methods, including heat treatment, forming and others specials methods of processing as are application of new forming method ECAP. Application of this method on aluminium alloys is described by many authors. From the reason low formability metals with hexagonal lattice the application of this method on magnesium alloys is now developed [3]. Paper presents results of investigations in new commercial prepared of modify magnesium alloy MgAl8MnCa with the following chemical composition (wt %): Al - 7,8; Zn - 0.05; Mn - 0.172; Ca - 0.9; rest Mg. Modify magnesium alloy MgAl8MnCa is a competitive cost alloys with aluminum 380. It is a creep resistant alloy with the capability of long-term operation at temperatures up to 150°C under high loads. This alloy exhibits good castability, corrosion resistance and mechanical properties at room temperature, similar or better to AZ91D. The main modifying element is Ca. Comparison the basic mechanical properties are shown in Table 1 [4]. The creep resistance of the alloy is substantially superior to that of commercial magnesium alloys at temperature of 130-150°C under stresses of 50-80MPa. The main applications targeted by this alloy include gearbox housings, valve covers, intake manifolds, oil pans, oil pumps and many under the hood components. For the metallographic analysis of structure magnesium alloy MgAl8MnCa the light microscopy and SEM were used.