©2019 The Japan Institute of Metals and Materials. Utilizing £/¡ transformation allows for a wider range of structure control for Al 2 O 3 -forming FeCrAl alloys considered as a candidate for the advanced fast reactor fuel cladding. In this research, nickel addition was explored as a method for creating £-austenite at 1000°C and retaining ¡-ferrite at room temperature through computing phase diagram by FactSage and implementing HT-XRD & EPMA experiments. In addition, Al 2 O 3 scale formation by oxidation test was implemented at 1000°C. Those results indicated that structure control by the £/¡ transformation is realized with appropriate aluminum and nickel addition, keeping continuous Al 2 O 3 scale formation.