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Wpływ dodatku tytanu na mikrostrukturę i twardość stopu AlSi11

100%

Mola R. , Konieczny M. , Depczyński W.

tom Z. 13

288--294

W prezentowanym artykule badano wpływ dodatku tytanu na mikrostrukturę i twardość stopu AlSi11. Wykonano stopy o zawartości 0,4%Ti i 1%Ti, które odlewano do metalowej formy. Z uzyskanych stopów wycięto próbki do badań strukturalnych, które prowadzono na mikroskopie optycznym i mikroskopie skaningowym. Wykonano pomiar twardości stopów AlSi11 z dodatkiem tytanu. Stwierdzono wzrost twardości stopów wraz ze wzrostem zawartości tytanu.

In this study, the influence of titanium addition on the microstructure and hardness has been investigated. The AlSi11 alloys with 0,4%Ti and 1%Ti were prepared. This alloys were casting in the metal mold. Metallographic observations have been made by the optical microscopy and scanning electron microscopy. The addition of the Ti to AlSi11 alloys leads to an increase in hardness values.

Heat treatment of EN AC-AlSi13Cu2Fe silumin and its effect on change of hardness of the alloy

100%

Pezda J.

2010

tom Vol. 10, iss. 1 spec.

131--134

Wide application of aluminum casting alloys is connected with their very good physical and technical properties. Within such group of alloys, silumins play important role in automotive and aviation industry, as well as in another branches of technique, because the silumins enable casting of complicated shapes. The most important parameters which predetermine mechanical properties of a material in aspects of suitability for castings of machinery components are: tensile strength (Rm), elongation and hardness. Alloys based on equilibrium system of Al-Si comprise additional constituents (e.g.: Mg, Cu) enabling, except modification, improvement of mechanical properties, obtained in result of heat treatment. In the paper are presented results of investigations concerning effect of the heat treatment on change of hardness (HB) of the EN AC-AlSi12Cu2Fe alloy. Investigated alloy was melted in an electric resistance furnace. Run of the crystallization was presented with use of the thermal-derivative method (ATD). This method was also implemented to determination of heat treatments temperature range of the alloy. Performed heat treatment gave effect in change of the hardness. Performed investigations have enabled determination of heat treatment parameters range, which conditions suitable hardness of the investigated alloy.

Effect of T6 Treatment Parameters of AlZn10Si7MgCu Alloy on Change of its Hardness and Impact Strength

100%

Pezda J.

tom Vol. 13, iss. 1 spec.

143--146

Among alloys of non-ferrous metals, aluminum alloys have found the widest application in foundry industry as a competitive alternative of ferroalloys. One from methods to improve mechanical properties of aluminum alloys is a heat treatment consisting in heating a material to solutioning temperature, keeping the material in such temperature, and subsequent rapid cooling and natural or artificial ageing. In the paper are presented test results concerning effects of the T6 heat treatment, comprising solutioning and artificial ageing, on hardness and impact strength of the AlZn10Si7MgCu alloy poured into metal moulds. Temperature ranges of solutioning and ageing treatments were selected on the base of recorded curves from the ATD method. Basing on three-stage plan of the investigations with four variables one determined range of the heat treatment parameters, what is a condition of obtainment of required HB hardness of the investigated alloy. Further investigations shall concern correction of obtained results with respect to the HB hardness and impact strength, obtained for selected castings of machinery components.