The phase diagram for the three component system Cu-Mn-Pb was determined by thermal analysis and from the diagram suitable compositions were found. The caution in making alloys of this system lies in the fact that the liquidus tends to separate into two liquid phases. Silicon added to the three component alloys distinctly improves the mechanical properties, also the excellent abrasion resisting property of the alloys is not inferior to that of phosphor bronzes.
Graphitization in cast iron is not hindered to any appreciable extent by Mo additions. On the contrary, graphite flakes are rendered finer and the matrix iron strengthened. Less than 1.5% addition considerably increases the tensile strength and hardness. The corrosion resisting property is almost not at all affected.