Effects of Fabricating Method and Chemical Compositions of Al-Clad Materials on Formation of Intermetallic Phases
Kazumasa NISHIO, Mitsuaki KATOH, Takayuki KAWANO
Al-clad materials were fabricated from commercial aluminum alloys of A1050, A1100 and A3003 as an overlay plate, mild steel SS400 and stainless steel SUS304 as a base plate using three methods of explosive bonding as well as roll bonding in air and roll bonding in vacuum. The isothermal heat treatments at 580 to 650°C for 0 to 60 s were given to the Al-clad materials to study the formation of Al-Fe intermetallic phases. Main results obtained are as follows ; (1) FeAl3 and Fe2Al5 were formed in the bond interface of the Al-clad steels, and only (Fe, Cr, Ni) Al3 was formed in the bond interface of the Al-clad stainless steel. (2) The highest growth rate of these phases was in the bond interface of the explosively bonded Al-clad steel, the second highest rate was in the Al-clad steel roll bonded in vacuum and the lowest rate was observed in the Al-clad steel roll bonded in air. (3) Effect of the purity of the aluminum alloys on the formation of the intermetallic phases was not readily noticeable. However, the growth rate in the bond interface of Al-clad steel fabricated from high purity aluminum (99.99 mass%) was the highest of all Al-clad steels roll bonded. (4) The thickness of the intermetallic phases in the Al-clad steels was larger than that in the Al-clad stainless steel under the same isothermal heat conditions.