Yield strength of Ni–Al–Cr superalloy under pressure

Journal Article · Fri Oct 23 00:00:00 EDT 2015 · Journal of Alloys and Compounds

DOI:https://doi.org/10.1016/j.jallcom.2015.10.092· OSTI ID:1579839

Raju, S. V. ^[1]; Godwal, B. K. ^[2]; Yan, J. ^[3]; Jeanloz, R. ^[2]; Saxena, S. K. ^[1]

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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)

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.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
• Grant/Contract Number: AC02-05CH11231; NA0001974; FG02-99ER45775; AC02-06CH11357; FA9550-12-1-0456
• OSTI ID: 1579839
• Alternate ID(s): OSTI ID: 1359225
• Journal Information: Journal of Alloys and Compounds, Vol. 657, Issue C; ISSN 0925-8388
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
metals and alloys
rapid-solidification
quenching
elasticity
mechanical properties
strain
high pressure
x-ray diffraction