Mechanism of superplasticity in gamma TiAl alloys

Conference · Sat Dec 30 23:00:00 EST 1995

OSTI ID:225131

Mishra, R S; Lee, W B; Mukherjee, A K ^[1]; Kim, Y W ^[2]

---

1. Univ. of California, Davis, CA (United States). Dept. of Chemical Engineering and Materials Science
2. UES, Inc., Dayton, OH (United States). Materials and Process Division

Superplastic deformation in three {gamma}-TiAl alloys having different compositions but similar duplex microstructure was investigated in the temperature range of 1,180--1,310 C and strain rate of 5 {times} 10{sup {minus}5}s{sup {minus}1}--10{sup {minus}3} in vacuum. Superplasticity with a maximum elongation of 470% has been demonstrated in these alloys. The optimum strain rate increased to a higher value in the alloy which had a finer grain size. All of these alloys showed similar stress-strain behavior. The TEM investigation revealed extensive dislocation activities within the gamma grains in Region 3, whereas it was significantly less in Region 2.

• OSTI ID: 225131
• Report Number(s): CONF-950201--; ISBN 0-87339-304-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BORON ADDITIONS
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
DISLOCATIONS
ELONGATION
GRAIN BOUNDARIES
GRAIN SIZE
INTERMETALLIC COMPOUNDS
MANGANESE ADDITIONS
MICROSTRUCTURE
NIOBIUM ALLOYS
PLASTICITY
SILICON ADDITIONS
STRAIN RATE
STRESSES
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY