Fe–Al–O ODS alloy prepared via mechanical alloying was subjected to three different heat treatments. Material basic state exhibited a fine-grained (300–500 nm) microstructure with fine dispersion of aluminum oxide particles (60% up to 20 nm). Heat treatment at 1100 °C for 3 h resulted in local grain and particles coarsening. Prolongation of the heat treatment to 24 h resulted in further grain (50 % up to 5 μm) and particle (25 % with size 25–40 nm) coarsening. Annealing at 1200 °C for 24 h led to a bimodal microstructure (35 % of grains with size 100–250 μm and 45 % of particles with size 30–60 nm) and substantial oxide particle coarsening. Microstructural changes resulted in tensile strength decrease and ductility increase. Tensile tests at 800 °C revealed a 90% decrease of tensile strength while ductility increased 4–6 times when compared to the room temperature tests. The hardening ratio was below 10 % for all the alloys and both test temperatures.

通过以下方法制备的Fe–Al–O ODS合金机械合金化经历了三种不同的热处理。材料的基本态表现出细粒度（300-500 nm）的微观结构，氧化铝颗粒的细分散性（60％直至20 nm）。在1100°C下热处理3小时导致局部晶粒和颗粒变粗。热处理时间延长至24小时会导致进一步的晶粒（50％，最大5μm）和颗粒（25％，尺寸25-40 nm）变粗。在1200°C下退火24小时会导致双峰微观结构（35％的晶粒尺寸为100–250μm，45％的晶粒尺寸为30–60 nm）和大量的氧化物颗粒变粗。微观结构的变化导致抗拉强度降低，延展性提高。与室温测试相比，在800°C的拉伸试验中，拉伸强度降低了90％，而延展性则提高了4-6倍。