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

100%

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

2010

tom Vol. 45, nr 2

120-124

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.

Analiza możliwości eliminacji ołowiu w odlewniczych stopach miedzi

67%

Ciura L. , Cwolek B. , Malec W. , Marchewka Ł.

tom R. 52, nr 5

254-262

Opierając się na doniesieniach literaturowych dokonano analizy możliwości eliminacji dodatku ołowiu w odlewniczych stopach miedzi przeznaczonych głównie na elementy armatury. Przedstawiono rolę, jaką pełni dodatek ołowiu w stopach odlewniczych oraz przyczyny konieczności ograniczenia lub eliminacji jego zawartości w tych materiałach. Na podstawie publikowanych wyników badań i patentów zaprezentowano możliwe sposoby rozwiązania tego problemu oraz scharakteryzowano opracowane i wprowadzone do praktyki przemysłowej nowe stopy ekologiczne. Przedstawiono pogląd autorów na stan zagadnienia i scenariusz jego rozwoju oraz określono potrzeby i kierunki prowadzenia prac badawczo-rozwojowych w tym obszarze

Based on literature reports an analysis was made of a possibility of lead elimination from the casting copper alloys designed mainly for fittings. The role played by an addition of lead in the casting alloys and the reasons why its content should be reduced or fully eliminated from these materials have been presented. Based on the published results and patents the alternative methods for solving this problem have been described, and new ecological alloys, which have been developed and implemented into industrial practice, have been characterised. The views of the authors on this question and the possible scenarios of its future development are presented. The needs and directions of further R&D works, which should be conducted in this field, have been outlined.