A solid-state foaming process known as Additive Expansion by the Reduction of Oxides (AERO) was further studied to determine if milling could be done at room temperature rather than under cryogenic conditions. A previously studied Cu-CuO composite was milled at room temperature with and without the use of a process control agent. It was determined that room temperature milling without a process control agent produced metal foams with porosity similar to those produced by cryogenically milled alloys. Therefore, the AERO process can be simplified to room temperature mechanical alloying for shorter periods of time.
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