Yield and work hardening of TiAl in the regime of inverse strain rate and temperature dependence

Book · Sat Dec 30 23:00:00 EST 1995

OSTI ID:225140

Bartels, A; Koeppe, C; Zhang, T; Mecking, H ^[1]

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1. Technical Univ. of Hamburg-Harburg, Hamburg (Germany)

By a two-step forging method an equiaxed microstructure was adjusted in Ti-48Al-2Cr and compression tests were performed between room temperature and 600 C. Above 250 C the normalized yield stress increases with increasing temperature but does not depend on strain rate. Up to about 400 C the work hardening is insensitive to temperature and dynamic recovery occurs above this temperature. A negative strain rate sensitivity {partial_derivative}{sigma}/{partial_derivative}(ln{dot {var_epsilon}}) in combination with serrated flow (Portevin Le Chatelier effect) develops during deformation in a temperature range between about 150 C and 450 C.

• OSTI ID: 225140
• Report Number(s): CONF-950201--; ISBN 0-87339-304-X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
ANNEALING
CHROMIUM ALLOYS
COMPRESSION STRENGTH
DISLOCATIONS
EXPERIMENTAL DATA
FORGING
GRAIN SIZE
HOT PRESSING
INTERMETALLIC COMPOUNDS
MICROSTRUCTURE
PORTEVIN-LE CHATELIER EFFECT
STRAIN HARDENING
STRAIN RATE
STRESSES
THERMOMECHANICAL TREATMENTS
TITANIUM ALLOYS
YIELD STRENGTH