Development of Creep Resistant TiAl Alloys for High Temperature Structural Applications

高温结构用抗蠕变TiAl合金的研制。TiAl基合金正被开发为航空航天和汽车应用的高温结构材料，因此它们的抗蠕变（高温下的长期强度）是至关重要的。本项目旨在通过添加稀土和剧烈塑性变形相结合的方法开发抗蠕变TiAl合金。期望得到由亚微米级片层和纳米级片层组成的精细稳定的微观结构。这将产生一种高度抗蠕变的TiAl原型材料，并最终导致商业化TiAl合金的发展。

Development of Creep Resistant TiAl Alloys for High Temperature Structural Applications. TiAl based alloys are being developed as high temperature structural materials for aerospace and automotive applications and thus their creep resistance (long-term strength at elevated temperatures) is critical. This project aims at developing creep resistant TiAl alloys through a combination of addition of rare earth and severe plastic deformation. It is expected that a refined and stablised microstructure consisting of submicron lamellar grains and nanosized lamellae be obtained. This will result in a highly creep resistant prototype TiAl material and leads eventually to the development of commercial TiAl alloys.