Abstract
Advanced Cu-40mass%Zn alloys with a high tensile strength and excellent machinability have been developed via a powder metallurgy (P/M) process. They are environmentally benign because fine graphite particles are included instead of lead (Pb) to improve their machinability. The effect of the content and particle size of the graphite on the mechanical properties and machinability are investigated in this paper. When applying a conventional P/M process consisting of the cold compaction and hot extrusion to consolidate elementally premixed mixture of Cu-40mass%Zn and graphite powder, the addition of 1 mass% graphite particles with m in diameter is suitable to obtain a high tensile strength and good machinability at the same time.
Highlights
Cu-40mass%Zn alloys have a good balance of strength and ductility at room temperature, nonmagnetic properties, and excellent malleability and machinability, which are strongly required in fabricating industrial components
Its elongation gradually decreases with increasing the graphite content because a poor ductility of graphite particulates causes the decrease of the elongation of the composite
Small and uniform dimple patterns are observed at the brass matrix. It means a good bonding between the primary brass alloy powders by hot extrusion and results in high tensile strength
Summary
Cu-40mass%Zn (brass) alloys have a good balance of strength and ductility at room temperature, nonmagnetic properties, and excellent malleability and machinability, which are strongly required in fabricating industrial components. They show a superior corrosion resistance inneutral and acidified NaCl solution [1]. P/M process is employed to prepare brass alloys uniformly dispersed graphite particles because there is a very limited effect of the large difference of the specific gravity on the segregation of the graphite particles in the elemental mixture powder. The effect of the particle size and content of the added graphite particles on the mechanical properties and machinability of P/M extruded Cu-40mass%Zn-graphite composites is investigated
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