Globularization of Two-Phase Titanium Alloy during Deformation at 600 and 800°C

Abstract:

Microstructure evolution and mechanical behavior of alpha/beta Ti-6Al-4V titanium alloy with initial α-colony microstructure during uniaxial compression at 600 and 800°C to a height strain of 70% were studied. It was shown that decrease in deformation temperature considerably influences on the kinetics of globularization of a lamellar microstructure. At the lower temperature stages of strengthening and softening extend that associates with inhibition of globularization. Deformation at 600°C is also associated with a smaller fraction of high-angle boundaries during deformation, smaller fraction of globular grains, increased contribution of shear deformation and more intensive rotation of α-lamellae towards the metal flow direction. In contrast to 800°C, the rate of thinning of α-lamellae at the lower temperature is noticeably higher. The results obtained are related to the change of the type of dislocation slip in α-lamellae due to inhibition of dynamic recovery with decreasing deformation temperature.

• Periodical: Materials Science Forum (Volumes 715-716)
• Pages: 854-859
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.715-716.854
• Online since: April 2012
• Authors: Sergey V. Zherebtsov, Maria A. Murzinova, Gennady A. Salishchev
• Keywords: Globularization, Hot Deformation, Kinetic, Mechanical Behavior, Microstructure Evolution, Misorientation, Titanium Alloy, Warm Deformation

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DOI: 10.1016/j.actamat.2009.02.016