Mechanical and microstructural response of Ti-24Al-11Nb as a function of temperature and strain rate

Journal Article · Tue Dec 31 23:00:00 EST 1996 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(96)00089-4· OSTI ID:445347

Albert, D E; Gray, III, G T ^[1]

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1. Los Alamos National Lab., NM (United States). Materials Science and Technology Div.

The effect of temperature and strain rate on the substructure evolution and mechanical response of Ti-24Al-11Nb has been investigated. Deformation in compression at both dynamic (10{sup 3}/s) and quasi-static strain rates (10{sup {minus}1}/s and 10{sup {minus}3}/s) was studied. Quasi-static tests were performed at room temperature (RT) and {minus}196 C (LN2). Split-Hopkinson Pressure Bar tests were conducted at RT, 200 and 700 C. The true stress/true strain response of Ti-24Al-11Nb depended on both the applied strain rate and, to a lesser extent, the test temperature, the rate of strain hardening increased with increasing strain rate. The flow stress of Ti-24Al-11Nb at 3% strain increased with decreasing temperature at both quasi-static and dynamic strain rates. The strain rate sensitivity was determined to be 0.014, a moderate value. TEM indicated that heterogeneous planar slip was predominant under all deformation conditions.

• OSTI ID: 445347
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 1 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
36 MATERIALS SCIENCE
AEROSPACE INDUSTRY
ALUMINIUM ALLOYS
EXPERIMENTAL DATA
FLOW STRESS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NIOBIUM ALLOYS
STRAIN HARDENING
STRAIN RATE
TEMPERATURE DEPENDENCE
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY