| 摘要 |
An EDM wire having an outer coating of gamma phase brass with an overlaye r of continuous unalloyed zinc or ductile epsilon phase brass entrapping the gamma phase and a process for manufacturing the EDM wire is provided. A sec ond process for synthesizing a ductile epsilon phase brass coating on the af orementioned and other substrates is also provided. The first process includ es coating a copper bearing metallic core with zinc. The zinc coating is the n converted to gamma phase brass via a diffusion anneal and subsequently re- coated with zinc prior to being cold drawn to its finish diameter. The proce ss of converting a zinc coating to a ductile epsilon phase brass includes he at treating the wire at a temperature low enough to minimize or eliminate ch anges in the mechanical properties of the composite wire.
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