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Influence of the selected alloy additions on limiting the phase [alpha] formation in Cu-Zn alloys

Kozana J., Rzadkosz S., Piękoś M.

Archives of Foundry Engineering

2010

Vol. 10, iss. 1

221-225

Influence of the selected alloy additions into copper and zinc alloys was investigated in order to find out the possibility of limiting the precipitation of unfavourable phase [gamma]. The observation of microstructures and strength tests were performed. The results of metallographic and strength investigations indicate positive influence of small amounts of nickel, cobalt or tellurium. The precise determination of the influence of the selected alloy additions on limiting the gamma phase formation will be the subject of further examinations.

Refining processes of selected copper alloys

Rzadkosz S., Kranz M., Nowicki P., Piękoś M.

Archives of Foundry Engineering

2009

Vol. 9, iss. 2

29-34

The analysis of the refining effectiveness of the liquid copper and selected copper alloys by various micro additions and special refining substances - was performed. Examinations of an influence of purifying, modifying and deoxidation operations performed in a metal bath on the properties of certain selected alloys based on copper matrix - were made. Refining substances, protecting-purifying slag, deoxidation and modifying substances containing micro additions of such elements as: zirconium, boron, phosphor, sodium, lithium, or their compounds introduced in order to change micro structures and properties of alloys, were applied in examinations. A special attention was directed to macro and micro structures of alloys, their tensile and elongation strength and hot-cracks sensitivity. Refining effects were estimated by comparing the effectiveness of micro structure changes with property changes of copper and its selected alloys from the group of tin bronzes.