Binary Ti–Fe system. Part I: Experimental investigation at high pressure

The present work illustrates the effect of quasi-hydrostatic pressure on the positions and widths of the homogeneity ranges of the intermetallic phases TiFe and TiFe2 at high temperatures. The experiments were performed with Ti–Fe diffusion couples that were heat treated in a multi-anvil press at 2....

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Bibliographic Details
Published in:Calphad 2021-09, Vol.74, p.102322, Article 102322
Main Authors: Kriegel, Mario J., Wetzel, Marius H., Treichel, André, Fabrichnaya, Olga, Rafaja, David
Format: Article
Language:English
Subjects:
Bismuth
Diffusion
Diffusion couple
Electron probe microanalysis
Heat treatment
High temperature
Homogeneity
Hydrostatic pressure
Intermetallic compounds
Intermetallic phases
Iron
Iron compounds
Multi-anvil experiment
Phase stability
Phase transitions
Pressure effects
Titanium compounds
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Summary:The present work illustrates the effect of quasi-hydrostatic pressure on the positions and widths of the homogeneity ranges of the intermetallic phases TiFe and TiFe2 at high temperatures. The experiments were performed with Ti–Fe diffusion couples that were heat treated in a multi-anvil press at 2.5 GPa. The solubility limits of the phases were derived from the concentration profiles that were measured using electron probe microanalysis. It was found that the homogeneity ranges of TiFe and TiFe2 extend to higher titanium concentrations, if the pressure is applied. The positions of the phase boundaries of the intermetallics on the iron-rich side are not affected by the pressure. The accuracy of the experimental data including the homogeneity ranges and temperatures was verified by comparing the homogeneity ranges of β-Ti(Fe), α/δ-Fe(Ti) and γ-Fe measured in this study with the homogeneity ranges taken from literature. The pressure was calibrated using the pressure-induced phase transitions of bismuth. [Display omitted] •The homogeneity ranges of the intermetallic phases were studied at 2.5 GPa.•Diffusion couples were heat-treated at 1282 and 1395 K in a multi-anvil press.•The solubility limits of the phases were derived from EPMA concentration profiles.•Ti-rich boundaries of the intermetallics extend to higher Ti contents at 2.5 GPa.•The homogeneity ranges of β-Ti(Fe) and γ-Fe extend by the application of pressure.
ISSN:0364-5916
1873-2984
DOI:10.1016/j.calphad.2021.102322