Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/21093
Title: Hot deformation behavior of Ti–5.0Al–2.40Sn–2.02Zr–3.86Mo–3.91Cr alloy with an initial lamellar microstructure in the α + β phase field
Authors: Ning, Y
Fu, MW 
Hou, H
Yao, Z
Guo, H
Keywords: Ti–5.0Al–2.40Sn–2.02Zr–3.86Mo–3.91Cr
Deformation behavior
α + β phase field
Constitutive modeling
Processing maps
Issue Date: 2011
Publisher: Elsevier
Source: Materials science and engineering. A, Structural materials : properties, microstructure and processing, 2011, v. 528, no. 3, p. 1812-1818 How to cite?
Journal: Materials science and engineering. A, Structural materials : properties, microstructure and processing 
Abstract: Hot deformation behavior of Ti–5.0Al–2.40Sn–2.02Zr–3.86Mo–3.91Cr alloy with an initial lamellar microstructure in the α + β phase field was investigated at the temperatures of 1050–1130 K (all below the β-transus temperature) and the strain rates of 0.001–10.0 s−1 using processing maps. The apparent activation energy of deformation was calculated to be 313 kJ mol−1, and a constitutive equation by which the flow stress is represented as a function of strain rate and deformation temperature was developed. A processing map was constructed based on the experimental data for evaluation of the efficiency of power dissipation (η), identification of the instability regions and optimization of the α + β forging process parameters. It is found that the hot deformation at low temperature has high η value, and the microstructure obtained at high temperature is more homogeneous. The globularization process represents the moderate η value and contributes to the grain refinement. In order to obtain the homogeneous microstructure with fine grain, hot deformation should be carried out under the condition of (Topi: 1130 K, View the MathML sourceε˙opi:0.001 s−1). Flow instability is expected to occur at a single region with a higher strain rate (View the MathML sourceε˙≥3.0 s−1) across the temperature range (Td: 1050–1130 K) due to the possible occurrence of adiabatic shear banding or/and flow localization.
URI: http://hdl.handle.net/10397/21093
ISSN: 0921-5093
EISSN: 1873-4936
DOI: 10.1016/j.msea.2010.11.019
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