Effect of Heat-treatment Conditions on Microstructure and Shape Memory Properties of Ti–4.5Al–3V–2Fe–2Mo Alloy

  • Yuichi Matsuki
  • Hirobumi Tobe
  • Eiichi Sato
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


The effect of heat treatment conditions on microstructure and superelasticity of Ti–4.5Al–3V–2Fe–2Mo (mass%) alloy was investigated by scanning electron microscopy with electron backscattered diffraction (SEM/EBSD) and loading-unloading tensile tests. The presence or absence of solution treatment (ST) at 1223 K before heat treatment at 1073 K was considered. The SEM analysis showed that the specimen without solution treatment had globular α and β grains while the solution-treated specimen had needle-shaped α in coarsened β grains. The loading-unloading tensile tests revealed that the stress for inducing martensitic transformation and shape recovery strain were almost the same in both the specimens, although the grain sizes of β austenite were significantly different.


Superelasticity Alpha + beta titanium alloy SP-700 Texture Heat-treatment 


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© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  1. 1.Institute of Space and Astronautical Science, Japan Aerospace Exploration AgencySagamiharaJapan
  2. 2.Department of Materials Engineering, Graduate School of EngineeringThe University of TokyoTokyoJapan

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