快速凝固TiAl化合物的研究进展

TiAl合金是一种很有希望的航空、航天及汽车用高温结构材料,但是其较低的室温塑性限制了它的应用.快速凝固技术有望使其性能得到改善.综述了近年来快速凝固TiAl合金的研究进展,包括快速凝固工艺、合金的发展以及合金的组织演变及其特征、力学性能及添加合金化元素的作用,亚稳相的产生及稳定性以及快速凝固薄带或粉末的固结等.

DEVELOPMENT OF RAPIDLY SOLIDIFIED TITANIUM ALUMINIDE COMPOUNDS

TiAl alloys are potential candidate materials in automotive and aerospace industries for high-temperature structural applications. However, the low room temperature plasticity limits their wide application. Rapid solidification technique may improve the properties through modification of microstructure. In this paper, the evolution and character of microstructure and mechanical properties of rapidly solidified TiAl alloys produced with various processing methods, and the effect of alloy additions on the solidification behavior, microstructure and properties were overviewed, including the production and stability of metastable phases, consolidation processes of rapidly solidified ribbons/powders. It is expected to provide useful information for future research and development of TiAl alloys with improved properties for future engineering applications.