Abstract
gamma-TiAl castings have been produced by induction skull melting (ISM), and their micro structures, hardness and tensile properties have been studied in the as-cast, hot isostatically pressed (HIPped) and HIPped + heat treated conditions. The equiaxed rosette grains found in the cast structure suggest that the alloy was cast in a partially solid condition. HIPping and heat treatment for 24 h at 1300 degreesC resulted in a duplex structure and decreased the hardness and tensile properties compared with the as-HIPped condition. The hardness and tensile properties also decreased with increasing bar diameter. The main fracture modes in duplex structures were transgranular (TG) in equiaxed gamma-grains and translamellar (TL) in lamellar grains. The presence of an alpha(2)/gamma lamellar structure can improve strength and ductility. (C) 2002 Elsevier Science B.V. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 31-37 |
| Number of pages | 7 |
| Journal | Materials Science and Engineering A |
| Volume | 329-331c |
| Publication status | Published - 1 Jan 2001 |
Keywords
- duplex structure
- fracture modes
- HIPped
- tensile properties
- gamma-titanium alummide
- microstructures