Authors: Gaofeng Liu Shangzhou Zhang Liqing Chen
Publish Date: 2011/04/26
Volume: 18, Issue: 2, Pages: 296-302
Abstract
The characteristics of hot deformation of an α+β titanium alloy Ti65Al35Mo15Zr03Si with acicular microstructure were studied using isothermal hot compressive tests in a strain rate range of 001–10 s−1 at 860–1 100 °C The true stresstrue strain curves of alloy hotcompressed in the α+β region exhibit a peak stress followed by continuous flow softening whereas in the β region the flow stress attains a steadystate regime At a strain rate of 10 s−1 and in a wide temperature range the alloy exhibits plastic flow instability According to the kinetic rate equation the apparent activation energies are estimated to be about 633 kJ/mol in the α+β region and 281 kJ/mol in the β region respectively The processing maps show a domain of the globularization process of α colony structure and α dynamic recrystallization in the temperature range of 860–960 °C with a peak efficiency of about 60 and a domain of β dynamic recrystallization in the β region with a peak efficiency of 80Foundation item Project50901063 supported by the National Natural Science Foundation of China Project2007DS0414 2007BS05006 supported by the Science and Technology Program of Shangdong Province China Project supported by the Open Research Fund from State Key Laboratory of Rolling and Automation Northeastern University China
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