INFLUENCE OF THE MASTER ALLOY Ti-Fe ON THE MICROSTRUCTURE AND SELECTED PROPERTIES OF COPPER AND COPPER ALLOYS

摘要

The performed metallographic tests and the obtained results of the selected mechanical properties of the analysed alloys revealed the justification of the undertaken research. Microstructure changes were obtained, mainly within grains but also in developed dendrites of the solid solution. Changes are occurring when titanium together with iron is introduced into copper as well as into binary silicon bronze. The maximum copper strengthening occurs when approximately 12 wt% of titanium is added. Simultaneously the plasticity - expressed by parameter A_5 - is decreased. Similar situation was observed at the master alloy Ti-Fe introduction into bronze CuSi4, however at much lower fraction of titanium in the alloy, i.e. 0.3 wt%. In this case we are dealing with the material in which the silica addition is decisive in forming the analysed properties. The applied master alloy was favourably acting both in the aspect of solving the alloy as well as in the improvement of strength properties.