Abstract
In this study, the microstructural characteristics and mechanical properties of Ti-1.0Fe alloy with equiaxed α + β microstructures were investigated in detail. Four different equiaxed α + β microstructures with β phase fraction ranging from 3 to 26 pct were obtained by hot deforming the martensite initial microstructure in α + β two-phase region with different deformation temperatures and cooling rates. The average nano-hardness of β grains was found to be much larger than that of α grains, which was attributed to the higher Fe concentration as well as nano-sized athermal ω precipitates inside the β grains. As a result, plastic strain partitioning occurred between the two phases during the tensile deformation, where the plastic strain within the soft α grains was much larger. With the increase of the β phase fraction, both yield and tensile strength of the samples increased, while at the same time, the total elongation gradually decreased. Most of the micro-cracks formed at the α/β interphase boundaries and propagated across the narrowest part of β phase. In the sample with the largest β phase fraction (26 pct), strain-induced β to α′ phase transformation occurred at the expense of initial athermal ω precipitates during the tensile deformation. This resulted into local nano-hardness variations between transformed and un-transformed β areas. Consequently, much more micro-cracks formed in this sample either at the boundaries between transformed and un-transformed β areas, or around the strain-induced α′ phase with a plate-like morphology. This explained the premature fracture shortly after necking in the sample with the largest β phase fraction.
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Acknowledgments
The authors are grateful to the financial support from Cross-ministerial Strategic Innovation Promotion Program (SIP) supported by the Cabinet Office of Japanese government and the Elements Strategy Initiative for Structural Materials (ESISM) in Kyoto University supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.
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Manuscript submitted August 30, 2019.
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Chong, Y., Zheng, R., Deng, G. et al. Investigation on the Microstructure and Mechanical Properties of Ti-1.0Fe Alloy with Equiaxed α + β Microstructures. Metall Mater Trans A 51, 2851–2862 (2020). https://doi.org/10.1007/s11661-020-05760-x
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DOI: https://doi.org/10.1007/s11661-020-05760-x