Effect of Mn Addition on Microstructural Changes and Mechanical Properties of Ti–5Al–2.5Fe Alloys

  • Gyeong Ryeong Bak
  • Dae-Won Jeong
  • Yong Taek Hyun
  • Hyun Soon Park


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.


Titanium alloys Mn addition Transmission electron microscopy Strain/stress measurements Phase fraction Oxygen 



The authors are grateful to Dr. J. C. Park for EELS measurements. This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF-2016R1D1A1B03934213) funded by the Ministry of Education and by INHA UNIVERSITY Research Grant (INHA-55432) as well as by Materials/Components Technology Development Program of Korea Evaluation Institute of Industrial Technology (Grant No. 10050608).


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Copyright information

© The Korean Institute of Metals and Materials 2018

Authors and Affiliations

  • Gyeong Ryeong Bak
    • 1
    • 2
  • Dae-Won Jeong
    • 1
    • 2
  • Yong Taek Hyun
    • 2
  • Hyun Soon Park
    • 3
  1. 1.Department of Materials Science and EngineeringDong-A UniversityBusanRepublic of Korea
  2. 2.Titanium DepartmentKorea Institute of Materials Science (KIMS)ChangwonRepublic of Korea
  3. 3.Department of Materials Science and EngineeringInha UniversityIncheonRepublic of Korea

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