The diffusion characteristics of Fe-Ti during shear-extrusion solid-state bonding and the influence of the level of deformation
This study investigates the applicability of shear-extrusion bonding (SEB) for joining pure iron (DT4a) and pure titanium (TA2) dissimilar metals at 950 °C across varying deformation levels from 112.9 % to 144.4 %. Microstructural analysis confirmed effective metallurgical bonding achieved above 112...
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| Príomhchruthaitheoirí: | , , , , , |
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| Formáid: | Alt |
| Teanga: | Béarla |
| Foilsithe / Cruthaithe: |
Elsevier
2025-09-01
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| Sraith: | Materials & Design |
| Ábhair: | |
| Rochtain ar líne: | http://www.sciencedirect.com/science/article/pii/S0264127525008020 |
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| Achoimre: | This study investigates the applicability of shear-extrusion bonding (SEB) for joining pure iron (DT4a) and pure titanium (TA2) dissimilar metals at 950 °C across varying deformation levels from 112.9 % to 144.4 %. Microstructural analysis confirmed effective metallurgical bonding achieved above 112 % deformation, forming a strip-like interface structure composed of FeTi and Fe2Ti intermetallic compounds. Significant dislocation density near the interface facilitated accelerated diffusion of Fe and Ti atoms. Diffusion coefficients calculated using Fick’s second law revealed that increasing deformation dramatically enhanced interdiffusion: the average diffusion coefficient of Fe atoms in Ti increased by ∼ 12 times when deformation level from 112.9 % to 144.4 %, while that of Ti atoms in Fe increased by ∼ 3.5 times, corresponding to an increase in interdiffusion distance from 4.01 µm to 7.27 µm. Thermodynamic calculations based on Miedema theory yielded negative formation enthalpies and Gibbs free energies for FeTi (−24.553 kJ/mol) and Fe2Ti (−22.546 kJ/mol), confirming favorable conditions for their precipitation. The results demonstrate SEB’s effectiveness for Fe-Ti joining, driven by dislocation-assisted diffusion and controlled by deformation level. |
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| ISSN: | 0264-1275 |