Novel Cu-Mn Casting Alloys

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Currently, many alloys used for casting suffer from microshrinkage porosity, which limits their usability in many industries. The most common solution for this defect involves the use of lead and tin to fill-up and plug the continuous shrinkage porosity that forms in the alloys. However, there is an increasing amount of government regulation requiring industries to reduce the lead content used. There is an unmet need for new alloys with superior mechanical properties.

Researchers at Purdue University have found new Copper-Manganese (Cu-Mn) alloys that contain additional elements, such as Nickel (Ni), which have been shown to greatly enhance the overall mechanical properties. This alloy is a precipitation-hardenable casting alloy, which makes it unique for brass and bronzes. The binary Cu-Mn alloy with an age-hardening response allows the alloy to be casted and machined at a high ductility, reducing the amount of tool wear and increasing the machinability. Once the alloy is in final form, it is heat-treated, resulting in a substantial increase in strength. Due to higher strength and high castability, these alloys are feasible, cost-effective alternatives for high-pressure water pumps and marine components.

-Alloys with higher strength, especially with the added aging response
-Repairs do not require the use of lead, which is greatly restricted due to health concerns
-The very narrow freezing ranges of these alloys show no formation of microshrinkage porosity

Potential Applications:
-High-pressure water valves
-Other plumbing needs
-Marine components
Oct 10, 2015
Utility Patent
United States

Oct 10, 2014
United States
Purdue Office of Technology Commercialization
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