J Mater Sci Technol ›› 2003, Vol. 19 ›› Issue (03): 217-220.

• Research Articles • Previous Articles     Next Articles

Thermomechanical Behavior of Ti-6Al-4V Alloy

K.Farmanesh, A.Najafi-Zadeh   

  1. Dept. of Materials Engineering, Isfahan University of Technology, Isfahan 85154, Iran
  • Received:1900-01-01 Revised:1900-01-01 Online:2003-05-28 Published:2009-10-10
  • Contact: K.Farmanesh

Abstract: Ti-6Al-4V, among the Ti alloys, is the most widely used. In the present work, the behavior of Ti-6Al-4V alloy has been investigated by the uniaxial hot isothermal compression tests and a series of dilatometric experiments were also carried out to determine the transformation temperatures at different cooling rates. Specimens for hot compression tests were homogenized at 1050℃ for 10 min and then quickly cooled to different straining temperatures from 1050 to 850℃. Cooling rates were chosen fast enough to prevent high temperature transformation during cooling. Compression tests were conducted at temperatures from 1050 to 850℃ in steps of 50℃ at constant true strain rates of 10-3 or 10-2 s-1. The apparent activation energy for compression in two-phase region was calculated 420 kJmol-1. Partial globularization of α phase was observed in the specimen deformed at low strain rates and at temperatures near the transformation zone and annealed after deformation.

Key words: Titanium alloy, Hot pressing, Ti-6Al-4V, Dilatometry