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Zastosowanie badań termicznych na przykładzie analizy termiczno-derywacyjnej wybranych stopów odlewniczych magnezu i aluminium

Król M., Tański T., Snopiński P.

LAB Laboratoria, Aparatura, Badania

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2017

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R. 22, nr 3

36--40

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The temperature dependence of internal damping and elastic modulus of Mg alloy

Kasencak M., Palcek P., Blazek D.

International Journal of Applied Mechanics and Engineering

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2010

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Vol. 15, no 2

329-333

EN

In this work, the experimentally determined changes of internal damping of magnesium alloy AZ31 and the relative changes of the elastic modulus are presented. The changes of internal damping for the basic material in the temperature range 30-450 C were measured. Increase of the damping properties of magnesium alloy AZ31 about high temperatures is caused by the movement of the binary point defects activated by the temperature during the solidification of the dendritic structure.

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Development of environmentally friendly cast alloys. High-zinc Al alloys

Krajewski W., Buras J., Żurakowski M., Greer A., Mancheva M., Haberl K., Schumacher P.

Archives of Materials Science and Engineering

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2010

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Vol. 45, nr 2

120-124

EN

Purpose: The main purpose of this paper is presenting the results obtained in years 2007 – 2010 in frame of the project Marie Curie Transfer of Knowledge – CastModel. The project was focused, among others, at elaborating new, environmentally friendly cast alloys based on the Al-Zn system. Particularly, efforts were aimed at improving ductility of the sand cast high-zinc aluminium alloys (HZnAl) by using the newly elaborated master alloys, based on the Al-Zn-Ti system. Design/methodology/approach: The presented work is focused on the nucleation of the high-zinc Al-20 wt% Zn (HZnAl AlZn20) alloy, known as the high damping one, aiming at improving plastic properties of the sand castings. The melted alloy was nucleated with AlTi5B1 (TiBAl) and AlTi3C0.15 (TiCAl) refiners as well as with the newly introduced ZnAl-Ti3 one. During the research the following experimental techniques were used: LM, SEM-EBSD, EDS, TA, DSC, Quantitative Metallography, UTS, Elongation and Attenuation coefficient measurements. Findings: During the performed examinations it was found out that significant increasing of the grain population of the inoculated alloy increases plasticity represented by elongation. The attenuation coefficient of the nucleated alloy, measured using an Olympus Epoch XT device, preserves its high value. The results obtained allow to characterize the examined AlZn20 alloy as promissive, having good strength and damping properties as well as the environmentally friendly alloy because of its comparatively low melting temperatures. Practical implications: The grain-refined high-zinc aluminium alloys can be used as the high damping substitutes of the traditional, more energy consumable Fe-based foundry alloys. Originality/value: The newly elaborated ZnAl-Ti based master alloys show high refining potency and quick dissolution in low melting temperatures of about 500°C, and are the promissive alternatives of the traditional AlTi-based ones.

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An assessment of the effect of process history on the structure and mechanical properties of hypereutectic silumins

Szymszal J., Piątkowski J., Gierek A.

Archives of Foundry Engineering

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2007

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Vol. 7, iss. 3

167-170

EN

An effect of process history of manufacturing the AlSi17Cu3Mg1.5Ni1,5 alloy on its tensile strenght R_m hardness HB, and elongation A_5 was investigated. The individual elements of process history of the alloy fabrication included: type mould (sand or metal mould), modification process, and type of heat treatment (solutioning and ageing). Basing on a multivariance MANOVA test, it was possible to determine not only the effect of the main parameters, like foundry mould type, modification and heat treatment, but also an interaction of these effects. Consequently it has been concluded that the tensile strenght R_m of the examined alloy is statistically most affected by the process of modification, followed by the type of the applied heat treatment, and the type of foundry mould (metal mould). The strongest interactive effect on the value of R_m had a combination of the process and heat treatment.