|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||GAT-2017 (Gamma Alloys Technology - 2017)
||F-46: Hot Working Behavior and Microstructural Evolution of As-cast Ti-42Al-5.5Mn Alloy
||Hao Xu, Bo Chen, Yingche Ma, Lei Shu, Kui Liu
|On-Site Speaker (Planned)
the research focused on the hot deformation behavior of Ti-42Al-5.5Mn(at%) ingot produced by vacuum induction melting(VIM) and vacuum arc remelting(VAR). The experiment was performed by isothermal compression test at the temperatures between 1050-1250°C with the strain rates in the range of 0.001-10s<SUP>-1</SUP>. Three results concluded from the investigation: Firstly, the processing map based on strain-stress curves, which revealed the alloy can be hot worked from 1250°C-10s<SUP>-1</SUP> to 1050°C-0.1s<SUP>-1</SUP>. Secondly, the constitutive equation was established to describe the flow behavior and yielded stress exponent of 2.71 and apparent activation energy of 596.7kJ/mole. Thirdly, the alloy exhibited flow instability at lower temperatures and higher strain rates, as predicted by the processing map. The surface fractures of corresponding specimens were in accordance with massive streamlined microstructure. Inversely, fine microstructure and β/γ globularization were generated by dynamic recrystallization(DRX) at higher temperatures and lower stain rates.
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