Abstract
The microstructures and mechanical properties were investigated in newly developed Ti–5Al–2.5Fe and Ti–5Al–2.5Fe–2Mn alloys, which were fabricated by two-step hot rolling processes. Lamellar structures were observed in the Ti–5Al–2.5Fe–2Mn alloy aged at 600 °C for 24 h, depending on the viewing directions (normal, rolling, and transverse). In the aged Ti–5Al–2.5Fe alloy, a spheroidized α matrix and TiFe precipitates in the α grain boundary were observed, with a crystallographic orientation relationship of (011)TiFe//(01 $$\overline{1}$$ 0)α. It was found that Mn addition improved the mechanical properties, attributed to the increased β phase (approximately 4.3 times relative to the Ti–5Al–2.5Fe alloy) and solid solution strengthening. Interestingly, in the Ti–5Al–2.5Fe alloys, the oxygen was enriched by the TiFe phase rather than the α phase, which may weaken the oxygen solute dragging effect.
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