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Title: Yield strength of Ni–Al–Cr superalloy under pressure

Abstract

Ni based superalloy Ni–Al–Cr with γ and γ' phase was studied under high pressure up to 30 GPa using diamond anvil cell technique. In-situ X-ray diffraction data was collected on these alloys under hydrostatic and non-hydrostatic conditions. Cubic phase remains stable up to the highest pressure of about 30 GPa. Bulk modulus and its pressure derivative obtained from the volume compression of pressure data are K = 166.6 ± 5.8 GPa with K' set to 4 under hydrostatic conditions and K = 211.3 ± 4.7 GPa with K' set to 4 for non-hydrostatic conditions. Using lattice strain theory, maximum shear stress ‘t’ was determined from the difference between the axial and radial stress components in the sample. The magnitude of shear stress suggests that the lower limit of compressive strength increases with pressure and shows maximum yield strength of 1.8 ± 0.3 GPa at 20 GPa. Further, we have also determined yield strength using pressure gradient method. In both the methods, yield strength increases linearly with applied pressure. Here, the results are found to be in good agreement with each other and the literature values at ambient conditions.

Authors:
 [1];  [2];  [3];  [2];  [1]
  1. Florida International University, Miami, FL (United States)
  2. University of California, Berkeley, CA (United States)
  3. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Santa Cruz, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1579839
Alternate Identifier(s):
OSTI ID: 1359225
Grant/Contract Number:  
AC02-05CH11231; NA0001974; FG02-99ER45775; AC02-06CH11357; FA9550-12-1-0456
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Alloys and Compounds
Additional Journal Information:
Journal Volume: 657; Journal Issue: C; Journal ID: ISSN 0925-8388
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; metals and alloys; rapid-solidification; quenching; elasticity; mechanical properties; strain; high pressure; x-ray diffraction

Citation Formats

Raju, S. V., Godwal, B. K., Yan, J., Jeanloz, R., and Saxena, S. K. Yield strength of Ni–Al–Cr superalloy under pressure. United States: N. p., 2015. Web. doi:10.1016/j.jallcom.2015.10.092.
Raju, S. V., Godwal, B. K., Yan, J., Jeanloz, R., & Saxena, S. K. Yield strength of Ni–Al–Cr superalloy under pressure. United States. https://doi.org/10.1016/j.jallcom.2015.10.092
Raju, S. V., Godwal, B. K., Yan, J., Jeanloz, R., and Saxena, S. K. Fri . "Yield strength of Ni–Al–Cr superalloy under pressure". United States. https://doi.org/10.1016/j.jallcom.2015.10.092. https://www.osti.gov/servlets/purl/1579839.
@article{osti_1579839,
title = {Yield strength of Ni–Al–Cr superalloy under pressure},
author = {Raju, S. V. and Godwal, B. K. and Yan, J. and Jeanloz, R. and Saxena, S. K.},
abstractNote = {Ni based superalloy Ni–Al–Cr with γ and γ' phase was studied under high pressure up to 30 GPa using diamond anvil cell technique. In-situ X-ray diffraction data was collected on these alloys under hydrostatic and non-hydrostatic conditions. Cubic phase remains stable up to the highest pressure of about 30 GPa. Bulk modulus and its pressure derivative obtained from the volume compression of pressure data are K = 166.6 ± 5.8 GPa with K' set to 4 under hydrostatic conditions and K = 211.3 ± 4.7 GPa with K' set to 4 for non-hydrostatic conditions. Using lattice strain theory, maximum shear stress ‘t’ was determined from the difference between the axial and radial stress components in the sample. The magnitude of shear stress suggests that the lower limit of compressive strength increases with pressure and shows maximum yield strength of 1.8 ± 0.3 GPa at 20 GPa. Further, we have also determined yield strength using pressure gradient method. In both the methods, yield strength increases linearly with applied pressure. Here, the results are found to be in good agreement with each other and the literature values at ambient conditions.},
doi = {10.1016/j.jallcom.2015.10.092},
journal = {Journal of Alloys and Compounds},
number = C,
volume = 657,
place = {United States},
year = {Fri Oct 23 00:00:00 EDT 2015},
month = {Fri Oct 23 00:00:00 EDT 2015}
}

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Cited by: 6 works
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