|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||F-30: Flow Stress Behavior of Ti-45Al-12Nb Alloy with Ultrafine Grains during Hot Compression Deformation
||Hua Chen, Xue Bo Gong
|On-Site Speaker (Planned)
The flow stress behaviors of Ti-45Al-12Nb titanium alloy during hot compression deformation are investigated. The functional characteristics are measured by thermal simulator Gleeble-1500D, in the deformation temperature range of 1100–1200░C, at constant strain rate ranging from 0.0001 s−1áto 0.01s−1. The influence of temperature and strain rate on the flow stress behaviors are discussed and constitutive equation is derived. The experimental results reveal that Ti-45Al-12Nb alloy with ultrafine grains is sensitive to strain rate and temperature, and all the true stress–strain curves show the characteristics of strain hardening (at the true strain lower than 0.15) . At the same temperature, the peak stress decreases with the decrease of strain rate. Under constant strain rate, the peak stress shows a clear trend of declining with increasing deformation temperature. The activation energy for the hot deformation is 693.55kJ/mol by calculating, which is higher than that for self-diffusion of TiAl alloy.
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