我国典型金属间化合物基高温结构材料的研究进展与应用

Intermetallics is composed of two or more metals or of a metal and a nonmetal. The coexistence of covalent and metal bond makes the intermetallic compound have long-term ordered superlattice structure, which greatly reduces dislocation mobility at high temperature, thus exhibiting good high-temperature strength. Typical structural intermetallics such as Ti-Al, Ni-Al and Nb-Si, have the advantages of excellent high-temperature strength and low density, which are very suitable for high-temperature structural parts of aerospace. However, the application of such materials is limited by low fracture toughness at room temperature and poor oxidation resistance at high temperature, which attracts more and more attentions and brings challenges in this field. In this paper, the research and application status in high-temperature strengthening, toughening, oxidation resistance and preparation technology of Ti-Al, Ni-Al, Nb-Si intermetallics-based alloys are introduced.