Abstract
The influence of meso-factor on fracture mechanism of intermetallic compound Ti34wt. %Al was examined with the in-situ observation of fatigue mechanism by scanning electron microscope (SEM) -servo testing. Especially, the concept of High Performance Design System applying advanced structure material (TiAl alloy) was discussed by the mesoscopic fracture analysis. The main results obtain were as follows : (1) Ti34wt. %Al exhitbits a superior fatigue property to Ti36wt. %Al, Hastelloy-X and a close fatigue propagating charactaristic to CMSX-4, IN783LC. (2) Lamellar structure influence on the fatigue prorety of Ti34wt. %Al. That is, after crack initiating at the casting defect and γ phase, lamellar structure arrest mesocrack growth. In fatigue crack growth process, fatigue crack growth zigzags and deviates, deponding on lamellar structure. And lamellar structure arrest fatigue crack growth. (3) High Performance Design System applying intermetallic compound TiAl alloy is realized by understanding the effect of lamellar structure on crack inisiation and propagation, and constructing fracture controlled method constituted material design, structure design and preventive maintenance from a whole.
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