High strain rate deformation of Ti-48Al-2Nb-2Cr

Journal Article · Wed May 01 00:00:00 EDT 1996 · Acta Materialia

DOI:https://doi.org/10.1016/1359-6454(95)00329-0· OSTI ID:247934

Maloy, S A; Gray, III, G T ^[1]

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1. Los Alamos National Lab., NM (United States)

The compressive deformation behavior of Ti-48Al-2NB-2Cr in the duplex microstructural morphology has been studied at strain rates of 0.001 and 2,000 s{sup {minus}1} over the temperature range from {minus}196 to 1,100 C. The yield stress for the duplex microstructure is strain rate sensitive at 25 C and increases with temperature from 500 to 1,100 C at a strain rate of 2,000 s{sup {minus}1}. TEM investigations revealed that deformation occurs in {gamma}-TiAl by means of {l_brace}111{r_brace}<112> twinning, 1/2<110> slip and <101> superdislocations under all conditions depending on the orientation of the grain with respect to the deformation axis. Optical metallography revealed that twinning increases with increasing strain rate. The flow stress anomaly is discussed in reference to the dislocation substructure in {gamma}-TiAl.

• OSTI ID: 247934
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 5 Vol. 44; ISSN XZ504Y; ISSN 1359-6454
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHROMIUM ALLOYS
DEFORMATION
DISLOCATIONS
FLOW STRESS
INTERMETALLIC COMPOUNDS
MICROSTRUCTURE
NIOBIUM ALLOYS
OPTICAL MICROSCOPY
ORIENTATION
SLIP
STRAIN RATE
TITANIUM ALLOYS
TRANSMISSION ELECTRON MICROSCOPY
TWINNING
YIELD STRENGTH