Neutron diffraction of titanium aluminides formed by continuous electron-beam treatment

19th International Summer School on Vacuum, Electron and Ion Technologies

Valkov, S.^1 ; Neov, D.^2 ; Luytov, D.^3 ; Petrov, P.^1

Emil Djakov Institute of Electronics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee, Sofia

1784, Bulgaria^1

Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Moscow Region, Dubna

141980, Russia^2

Department of Solid State Physics and Microelectronics, Faculty of Physics, St. Kl. Ohridsky University of Sofia, 5 J. Bourchier blvd., Sofia

1164, Bulgaria^3

关键词: Chemical compositions;    Electron beam evaporation;    Electron beam irradiation;    Electron beam technology;    Electron-beam treatment;    Intermetallic phasis;    Nano-indentation measurements;    Nanoindentation tests;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/700/1/012034/pdf
DOI  :  10.1088/1742-6596/700/1/012034

来源: IOP

【 摘 要 】

Ti-Al-based alloys were produced by hybrid electron-beam technologies. A composite Ti-Al film was deposited on a Ti substrate by electron-beam evaporation (EBE), followed by electron-beam treatment (EBT) by a continuously scanned electron beam. The speed of the specimens motion during the EBT were V1= 1 cm/sec and V2= 5 cm/sec, in order to realize two different alloying mechanisms - by surface melting and by electron-beam irradiation without melting the surface. The samples prepared were characterized by XRD and neutron diffraction to study the crystal structure on the surface and in depth. SEM/EDX analysis was conducted to explore the surface structure and analyze the chemical composition. Nanoindentation measurements were also carried out. No intermetallic phases were registered in the sample treated at velocity V1, while the sample treated at V2exhibited a Ti3Al/TiAl structure on the surface, transformed to Ti/TiAl in depth. The nanoindentation test demonstrated a significant negative hardness gradient from the surface to the depth of the sample.