Abstract
The effect of severe plastic deformation applied through friction extrusion (FE) method on an Al-Ti composite billet is summarized. Formation of layered amorphous regions and specific atomic ratios (R) of Ti/Al, in addition to some crystalline Al-Ti intermetallic compounds (IMC), e.g., TiAl3 and TiAl forming et al./Ti interfaces, are noted after the deformation FE process. It seems that the amorphous regions form first and subsequently transform to corresponding Al-Ti IMCs. Semi-in situ heating demonstrated the thermal stability of such Al-Ti amorphous layered structures, with the phase transformation sequence being R = 1:3 (TiAl3, 250 °C) → R = 1:1 (TiAl, 400 °C) → R = 3:1 (Ti3Al, > 500 °C).
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Acknowledgements
This work was supported by the Laboratory Directed Research and Development (LDRD) program at Pacific Northwest National Laboratory (PNNL) as part of the Solid Phase Processing Science Initiative (SPPSi). Support and extensive support from Cindy Powell and Arun Devaraj as part of SPPSi leadership team is graciously acknowledged. TEM experiments were performed using facilities at the Environmental Molecular Sciences Laboratory (EMSL), a national scientific user facility sponsored by the U.S. Department of Energy’s (DOE’s) Office of Biological and Environmental Research and located at PNNL. PNNL is a multiprogram national laboratory operated by Battelle for the DOE under Contract DEAC05-76RL01830.
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Song, M., Darsell, J. & Jana, S. Amorphization and alloying in Al-Ti system through friction extrusion method. J Mater Sci 57, 12055–12063 (2022). https://doi.org/10.1007/s10853-022-07355-w
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DOI: https://doi.org/10.1007/s10853-022-07355-w