An analysis of the low temperature, low and high strain-rate deformation of Ti-6Al-4V

Journal Article · Mon May 01 00:00:00 EDT 1989 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (USA)

DOI:https://doi.org/10.1007/BF02651653· OSTI ID:6978850

Follansbee, P S; Gray, G T ^[1]

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1. Los Alamos National Lab., NM (USA)

The deformation behavior of Ti-6Al-4V at temperatures between 76 and 495 K, strain rates between 0.001 and 3000 s{sup {minus} 1}, and compressive strains to 0.3 has been investigated. Measurements of yield stress as a function of test temperature, strain rate, and prestrain history are analyzed. The mechanical threshold stress (flow stress at 0 K) is used as an internal state variable, and the contributions to the mechanical threshold stress from the various strengthening mechanisms present in this alloy are analyzed. Transmission electron microscopy (TEM) is used to correlate deformation substructure evolution with the constitutive behavior. The deformation substructure of Ti-6-4 is observed to consist of planar slip in the {alpha} grains at quasistatic strain rates. At high strain rates, deformation twinning is observed in addition to planar slip. Increasing the temperature to 495 K is seen to alter the deformation mode to more random slip; the effect of this on the proposed deformation model is discussed.

• OSTI ID: 6978850
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (USA), Vol. 20A:5; ISSN 0360-2133
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
DEFORMATION
TITANIUM ALLOYS
VANADIUM ALLOYS
LOW TEMPERATURE
STRESS ANALYSIS
TEMPERATURE EFFECTS
TRANSMISSION ELECTRON MICROSCOPY
ALLOYS
ELECTRON MICROSCOPY
MICROSCOPY
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies