In situ x-ray synchrotron diffraction experiments were carried out on nickel-based high-strength superalloys under pressure to understand their deformation mechanism using a diamond anvil cell (DAC). Radial x-ray diffraction determines the room-temperature equations of state and yield strengths of binary Ni3Al alloy and 500 ppm boron-doped Ni3Al to pressures of 20 and 46 GPa, respectively. Crystallographic preferred orientations observed in these superalloys due to anisotropic stress field in DAC indicate the onset of plastic deformation. Inverse pole figure analysis reveals that the underlying deformation mechanisms change from an octahedral slip to a simultaneous activation of octahedral and cube slips upon doping with boron. The yield-strength values were found to increase with pressure and are comparable to those determined from axial diffraction experiments. The results indicate that the yield strength of Ni3Al:B is about 0.5 GPa higher (at pressures below 20 GPa) due to grain boundary strengthening by boron. It is shown that due to high elastic anisotropy of Ni3Al alloy, the yield-strength estimations from diffraction experiments strongly depend on the micromechanical model used to convert the measured elastic strains into stresses.
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14 June 2021
Research Article|
June 08 2021
Deformation of binary and boron-doped Ni3Al alloys at high pressures studied with synchrotron x-ray diffraction
S. V. Raju
;
1
CeSMEC, Department of Mechanical and Materials Engineering, Florida International University
, Miami FL-33172, USA
b)Author to whom correspondence should be addressed: selvavennila@gmail.com
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R. N. Vasin
;
R. N. Vasin
2
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research
, Dubna 141980, Russia
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B. K. Godwal;
B. K. Godwal
3
Department of Earth and Planetary Science, University of California
, Berkeley, California 94720, USA
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R. Jeanloz;
R. Jeanloz
3
Department of Earth and Planetary Science, University of California
, Berkeley, California 94720, USA
4
Miller Institute for Basic Research in Science and Department of Astronomy, University of California Berkeley
, Berkeley, California 94720, USA
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H.-R. Wenk
;
H.-R. Wenk
3
Department of Earth and Planetary Science, University of California
, Berkeley, California 94720, USA
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S. K. Saxena
S. K. Saxena
1
CeSMEC, Department of Mechanical and Materials Engineering, Florida International University
, Miami FL-33172, USA
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a)
Present address: Oak Ridge Associated Universities, Belcamp, MD 21017, USA.
b)Author to whom correspondence should be addressed: selvavennila@gmail.com
J. Appl. Phys. 129, 225101 (2021)
Article history
Received:
November 10 2020
Accepted:
April 12 2021
Citation
S. V. Raju, R. N. Vasin, B. K. Godwal, R. Jeanloz, H.-R. Wenk, S. K. Saxena; Deformation of binary and boron-doped Ni3Al alloys at high pressures studied with synchrotron x-ray diffraction. J. Appl. Phys. 14 June 2021; 129 (22): 225101. https://doi.org/10.1063/5.0037012
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