Brazing porous TiAl intermetallic to 434L stainless steel;

This dissertation reports an investigation of bonding porous TiAl intermetallic with SS (stainless steel) used as common structure components.

Directional solidification and lamellar orientation control of TiAl intermetallics;

However,before practical application,the poor high-temperature oxidation resistance and wear resistance of TiAl intermetallics must be solved.

In recent years,considerable interest has developed in TiAl intermetallics because of unique properties such as low density,good stiffness,high elevated temperature strength,and excellent oxidation resistance.

The properties such as fragility in room-temperature and oxidation in high-temperature of TiAl intermetallic were introduced in this paper.

Using spark plasma sintering technique TiAl intermetallic powers was prepared and XRD was used to identify the phases of products.

The S/N experimental design has optimized the friction welding parameters of TiAl intermetallic compound to NiCr20TiAl.

TiAl intermetallic compound and HA powders were obtained by the method of mechanical alloying(MA) and chemical deposition respectively.

First-principle calculations were performed to study the effect of Nb on the bonding characteris-tics of TiAl intermetallic compounds with the emphasis on the electronic interactions between Ti (Al) and O atoms.