What are the best techniques to prepare copper beryllium alloy using high pure copper and beryllium metals?

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Bala Narasimha Guniputi

Actually i am working on Cu-Al-Be based shape memory alloy. in this regard, i melted pure copper and pure beryllium in the vacuum arc melting furnace. after the melt i observed a thin black layer on the surface of the melt. in order to avoid that, i need suggestions.