Characteristics of hot compression behavior of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy with an equiaxed microstructure

The hot compression behavior of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy with an equiaxed microstructure was examined in the temperature range of 900-1060 degrees C and strain rate range of 0.001-10 s(-1). The dynamic recrystallization (DRX), flow instability and texture of compressed Ti alloy are characterized by the processing maps and EBSD. The stress-strain curves of Ti alloys show that the continuous flow softening occurs, while the broad oscillations induced by adiabatic shear bands exist above strain rates of 1.0s(-1). The processing maps exhibit two DRX domains: alpha phase DRX domain in the range of 900-980 degrees C and 0.001-0.1s(-1), and the beta phase DRX domain in the range of 1000-1060 degrees C and 0.01-1.0s(-1). It is also found that the instable deformation region increases with strain increasing. In addition, EBSD results exhibit that DRX can cause the low angle boundaries (LABs) to decrease and the high angle boundaries (HABs) to increase in the alpha + beta region. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved