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This work attempts to identify the dependency of hardness and particle concentrations on testing locations and graphite exposure times. This will help identify optimal processing parameters to maximize hardness and alloy viability. Noted in the 2014 article, “Structure and Properties of Cast NearCongruent Copper-Manganese Alloys” in Metallurgical and Materials Transactions B, Chaput and Trumble designed a copper-manganese (Cu-34.6%Mn) alloy that has been shown to contain soft graphite and hard manganese carbide (Mn7C3) phases when exposed to graphite during casting. The graphite has been hypothesized to act as a lubricant in bearings, replacing toxic leaded brasses. Additionally, copper often has microbially resistant properties, but is too soft unalloyed. The alloy’s increased hardness could increase viability for use in hospitals or kitchenware. The alloy was consistently harder when exposed to graphite than the unexposed control, as seen in the accompanying image. No signifi cant comparisons could be made between samples exposed for diff erent times. The top half of the ingot was harder. The highest hardness measurements were observed furthest from the center of the cross section. Both hardness increases occurred in regions of quicker solidifi cation. More carbide particles were found further from the cross-section center.

Processing Manipulation of Carbon Content in Cu-34.6%Mn