The search for new materials capable of replacing nickel-based superalloys in aerospace applications has increased rapidly in the recent years. One of the candidates for this purpose is nickel aluminide NiAl provided that its main drawback, namely the inferior fracture toughness at room temperature is overcome. We propose rhenium as an addition to NiAl to improve its mechanical properties without compromising on the oxidation resistance. Two powder metallurgy techniques (HP and SPS) were used to obtain NiAl/Re sinters. Small amounts of rhenium (0.6 at%; 1.25 at%; 1.5 at%) almost doubled the flexural strength of NiAl and improved its fracture toughness by 60%. Microscopic investigations revealed rhenium particles at the boundaries of NiAl grains resulting in an enhanced fracture toughness. Mass changes during oxidation at 900 °C, 1100 °C and 1300 °C were relatively low. Plausible mechanisms of the fracture toughness enhancement and the oxidation behavior are discussed.

近年来，对能够在航空航天应用中替代镍基高温合金的新材料的搜索迅速增加。为此目的的候选者之一是铝化镍NiAl，只要其主要缺点，即在室温下的较差的断裂韧性得以克服。我们建议使用as作为NiAl的添加物，以改善其机械性能而不损害其抗氧化性。两种粉末冶金技术（HP和SPS）用于获得NiAl / Re烧结矿。少量的（（0.6 at％； 1.25 at％； 1.5 at％）几乎使NiAl的弯曲强度增加了一倍，并将其断裂韧性提高了60％。显微研究表明，particles颗粒位于NiAl晶粒的边界处，导致断裂韧性增强。在900°C的氧化过程中质量发生变化，1100°C和1300°C相对较低。讨论了断裂韧性增强和氧化行为的可能机理。