Flow behavior of Ti-24Al-11Nb at high strain rates

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6486086

Harbison, L S; Koss, D A ^[1]; Bourcier, R J ^[2]

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1. Pennsylvania State Univ., University Park, PA (USA). Dept. of Materials Science and Engineering
2. Sandia National Labs., Albuquerque, NM (USA)

The deformation and crack initiation behavior of Ti-24Al-11Nb has been examined over a temperature range of 298 to 923 K and for strain rates from 10{sup {minus}4}/s to 10{sup 2}/s. Tests performed in compression indicate much lower strain hardening at 10{sup 2}/s than at either 10{sup {minus}1}/s or 10{sup {minus}4}/s at all temperatures. Associated with this behavior is the occurrence of non-uniform, localized deformation bands at 10{sup 2}/s. An analysis indicates that adiabatic deformation conditions predominate at 10{sup 2}/s and that these result in adiabatic softening. Furthermore, as a result of non-uniform deformation and adiabatic heating, this Ti{sub 3}-Al-based alloy is actually more resistant to strain-induced microcrack initiation at 10{sup 2}/s than at 10{sup {minus}4}/s during room temperature testing. 16 refs., 7 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6486086
• Report Number(s): SAND-90-2909C; CONF-9010258-1; ON: DE91004506
• Resource Relation: Conference: TMS symposium on microstructure/property relationships in titanium alloys and titanium aluminides, Detroit, MI (USA), 7-11 Oct 1990
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
TITANIUM BASE ALLOYS
CRACK PROPAGATION
DEFORMATION
TEMPERATURE EFFECTS
ALUMINIUM ALLOYS
CHEMICAL ANALYSIS
MICROSTRUCTURE
NIOBIUM ALLOYS
SCANNING ELECTRON MICROSCOPY
STRAINS
STRESSES
ALLOYS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
MICROSCOPY
TITANIUM ALLOYS
360103* - Metals & Alloys- Mechanical Properties