PULSED ELECTRIC-CURRENT PRESS BONDING OF ALUMINUM ALLOY TO STAINLESS STEEL

摘要

A Pulsed Electric-Current Press (PECP) bonding process which is a new joining process using a spark plasma sintering apparatus was applied for dissimilar material joining between Al-Mg alloy (JIS A5056) and austenitic stainless steel (JIS SUS304) at the bonding temperatures of 673 to 773K with the holding times up to 1.8ks. The bonding pressures were 49 and 80MPa. No obvious reaction layer in the bonding interface was detected by at 673K. A small amount of FeAl_3 was formed as an intermetallic compound at the bonding interface at 723K, and Fe_2Al_5 became appeared in the reaction layer as well as FeAl_3 over 748K. The thickness of the reaction layer increased with increasing the holding temperature and time. The tensile strengths of the joints at 673K with pressure of 80MPa showed the highest values, 140MPa. The tensile strength of joints decreased with increasing the thickness of the reaction layer.