Transformations of α' martensite in Ti–Fe alloys under high pressure torsion

• Published in: Scripta materialia Vol. 136; pp. 46 - 49
• Main Authors: Kilmametov, A., Ivanisenko, Yu, Straumal, B., Mazilkin, A.A., Gornakova, A.S., Kriegel, M.J., Fabrichnaya, O.B., Rafaja, D., Hahn, H.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.07.2017
• Subjects: High-pressure torsion; Microstructure; Nano-crystalline metals; Thermodynamics and kinetics; Ti–Fe alloy; Thermodynamics and kinetics; Ti–Fe alloy; Nano-crystalline metals; Microstructure; High-pressure torsion
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/j.scriptamat.2017.04.010

Phase transitions in α'-Ti martensite driven by high pressure torsion (HPT) as well as α'→ω transformations in Ti–Fe alloys were observed for the first time. The as cast alloys transformed into α'-Ti martensite after annealing in the β-(Ti,Fe) solid solution region and subsequent quenching. Lattice parameters of α'-Ti martensite decreased with increasing iron content, similar to the lattice parameter of β-Ti. During HPT, α'-Ti martensite transformed partly into ω-Ti. At the same time, the lattice parameters of remaining α'-Ti phase increased towards those for iron-free α-Ti. These processes included an increased mass transfer of iron atoms out of α'-Ti. [Display omitted]