Cu-Be alloy (C17200) rod having diameter of 23.5mm was produced by a vacuum continuous casting method at furnace temperature range of from 1240°C to 1260°C with casting speed range of from 35mm/min to 103mm/min. When the furnace temperature was 1240°C and 1250°C, Cu-Be alloy rod without fracture could successfully produced at high casting speed of 103mm/min. However, when the furnace temperature was 1260°C, the breakout occurred at casting speed faster than 78mm/min. Surface roughness (Ra) increased with increasing not only a furnace temperature but also a casting speed.
This paper described extrudability and bonding strength of copper (TPC) clad aluminum
alloy (pure Al, Al3003, Al5005, and Al7072) composites produced by indirect extrusion at 350°C
with extrusion ratio of 21.39. Conical typed die with semi angle of 30°. Carbon oil was used to reduce
the friction between billet/sleeve and billet/die. Maximum extrusion pressure was estimated to
491MPa for the Cu/Al, 714MPa for the Cu/Al3003, 820MPa for the Cu/Al5005, and 743MPa for the
Cu/Al7072 alloy composites. No surface fracture was observed. From SEM observation, diffusion
layer between the sheath material and the core material of extruded composites is observed and its
thickness was measured to about 1.5㎛. The bonding strength was estimated to 65MPa for the Cu/Al,
89.3MPa for the Cu/Al3003, 70MPa for the Cu/Al5005, and 75MPa for the Cu/Al7072 alloy
composites.
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