Binary Ti–Fe system. Part I: Experimental investigation at high pressure |
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| Affiliation: | 1. School of Chemical Engineering, University of New South Wales, Sydney, 2052, Australia;2. Australian Centre for Advanced Photovoltaics, School of Photovoltaic and Renewable Energy Engineering, University of New South Wales, Sydney, NSW, 2052, Australia;3. Institute of Materials Genome and Big Data, Harbin Institute of Technology, Shenzhen, 510810, China |
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| Abstract: | 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. |
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| Keywords: | Diffusion couple Multi-anvil experiment Electron probe microanalysis Intermetallic phases Phase stability |
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