The oxidation of two two-phase ternary Fe-Cu-Al alloys containing about 5% Al(mole fraction), one Fe-rich and one Cu-rich, were studied at 700℃in 1×105 Pa pure oxygen. The Fe-rich alloy (Fe-15Cu-5Al) shows two quasi-parabolic stages, with a large increase of the parabolic rate constant after about 4 h. The presence of 5% Al does not change greatly the oxidation rate of Fe-15Cu-5Al with respect to a binary Fe-Cu alloy of similar composition, which was quite different from the situation of the same alloys oxidized at 800℃. Oxidation of Fe-15Cu-5Al at 700℃produced an outer layer of iron oxides and an inner layer containing a mixture of copper metal, iron and aluminium oxide. On the contrary, the Cu-rich Fe-85Cu-5Al alloy presents a rather irregular kinetic behavior, with formation of an inner continuous alumina thin layer and a rather irregular outer layer. The outer layer with a rather irregular thickness was mainly composed of a matrix of copper oxides plus some aluminium and iron oxides presenting in the deep part of the layer at certain locations. As a result of the formation of a protective alumina layer, the presence of 5% Al greatly reduced the oxidation rate of Fe-85Cu-5Al with respect to a binary Fe-Cu alloy of similar composition, which was also quite different from the situation of the same alloys oxidized at 800℃. Moreover, the oxidation rate at 700℃of the Fe-85Cu-5Al alloy was much lower than that of Fe-15Cu-5Al alloy due to the same reason.. The oxidation of two-phase ternary Fe-Cu-Al alloys containing about 5% Al (mole fraction), one Fe-rich and one Cu-rich, were studied at 700 ° C in 1 × 10 5 Pa pure oxygen. The Fe- The presence of 5% Al does not change greatly the oxidation rate of Fe-15Cu-5Al with a large increase of the parabolic rate constant after about 4 h. respect to a binary Fe-Cu alloy of similar composition, which was quite different from the situation of the same alloys oxidized at 800 ° C. Oxidation of Fe-15Cu-5Al at 700 ° C produced an outer layer of iron oxides and an inner layer containing a mixture of copper metal, iron and aluminum oxide. On the contrary, the Cu-rich Fe-85Cu-5Al alloy presents a rather irregular kinetic behavior, with formation of an inner continuous alumina thin layer and a rather irregular outer layer. The outer layer with a rather irregular thickness was mainly composed of a matrix of copper oxides plus some aluminum and iro As a result of the formation of a protective alumina layer, the presence of 5% Al greatly reduced the oxidation rate of Fe-85Cu-5Al with respect to a binary Fe- Cu alloy of similar composition, which was also quite different from the situation of the same alloy oxidized at 800 ° C. Moreover, the oxidation rate at 700 ° C. of the Fe-85 Cu-5Al alloy was much lower than that of Fe-15 Cu-5Al alloy due to the same reason ..