Study of the microstructure and thermomechanical properties of Mo/graphite joint brazed with Ti–Zr–Nb–Be powder filler metal

Fedotov I., Suchkov A., Sliva A., Dzhumaev P., Kozlov I., Svetogorov R., Bachurina D., Sevryukov O.
Тип документаJournal Article
Дата публикации2021-03-29
Название журналаJournal of Materials Science
ИздательSpringer Nature
КвартильQ1
ISSN00222461, 15734803
  • General Materials Science
  • Mechanical Engineering
  • Mechanics of Materials
Краткое описание
The aim of this work was to braze molybdenum and graphite with Ti–40Zr–8.5Nb–1.5Be filler metal in order to demonstrate the possibility of its application for X-ray tube target brazing, further to investigate the joint microstructure using energy-dispersive X-ray spectroscopy (EDS), electron backscattered diffraction (EBSD), X-ray diffraction (XRD), and electron microscopy as well as to conduct shear and unbrazing tests. It is shown that the brazed joint consists of matrix from β-(Ti, Mo) solid solution, mixed ZrC and TiC carbide layers at the braze/graphite interface, and beryllides TiBe2 and MoBe2 located at the grain boundaries of β-(Ti, Mo). The presented data made it possible to propose a brazed joint formation mechanism and explain the concentration of beryllides at the grain boundaries during brazing, as well as the mixed carbide layer formation from the side of the graphite. The mechanical tests showed that Mo/graphite brazed joints have a shear strength of at least 28.0 ± 0.9 MPa. However, sample failure occurred through the graphite due to the graphite surface mechanical treatment and the presence of a ductile β-Ti phase in the joint. The evaluation of joint thermal properties was performed using unbrazing tests. The unbrazing temperature was 1882 °C, which was caused by formation of refractory phases during brazing. The microstructure study shows that unbrazing occurs through the β-(Ti, Mo) phase with grain boundaries and beryllides eutectic melting.
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1. Fedotov I. и др. Study of the microstructure and thermomechanical properties of Mo/graphite joint brazed with Ti–Zr–Nb–Be powder filler metal // Journal of Materials Science. 2021. Т. 56. № 19. С. 11557–11568.
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TY - JOUR

DO - 10.1007/s10853-021-06015-9

UR - http://dx.doi.org/10.1007/s10853-021-06015-9

TI - Study of the microstructure and thermomechanical properties of Mo/graphite joint brazed with Ti–Zr–Nb–Be powder filler metal

T2 - Journal of Materials Science

AU - Fedotov, Ivan

AU - Suchkov, Alexey

AU - Sliva, Andrey

AU - Dzhumaev, Pavel

AU - Kozlov, Ilya

AU - Svetogorov, Roman

AU - Bachurina, Diana

AU - Sevryukov, Oleg

PY - 2021

DA - 2021/03/29

PB - Springer Science and Business Media LLC

SP - 11557-11568

IS - 19

VL - 56

SN - 0022-2461

SN - 1573-4803

ER -

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@article{Fedotov_2021,

doi = {10.1007/s10853-021-06015-9},

url = {https://doi.org/10.1007%2Fs10853-021-06015-9},

year = 2021,

month = {mar},

publisher = {Springer Science and Business Media {LLC}},

volume = {56},

number = {19},

pages = {11557--11568},

author = {Ivan Fedotov and Alexey Suchkov and Andrey Sliva and Pavel Dzhumaev and Ilya Kozlov and Roman Svetogorov and Diana Bachurina and Oleg Sevryukov},

title = {Study of the microstructure and thermomechanical properties of Mo/graphite joint brazed with Ti{\textendash}Zr{\textendash}Nb{\textendash}Be powder filler metal},

journal = {Journal of Materials Science}

}

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Fedotov, Ivan, et al. “Study of the Microstructure and Thermomechanical Properties of Mo/Graphite Joint Brazed with Ti–Zr–Nb–Be Powder Filler Metal.” Journal of Materials Science, vol. 56, no. 19, Mar. 2021, pp. 11557–68. Crossref, https://doi.org/10.1007/s10853-021-06015-9.