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Experimental and theoretical studies on the elasticity of tungsten to 13 GPa

Journal Article · · Journal of Applied Physics
DOI:https://doi.org/10.1063/1.5044519· OSTI ID:1529600
 [1];  [2];  [3];  [3];  [4]
  1. Stony Brook Univ., NY (United States). Dept. of Geosciences; Research foundation of SUNY
  2. Mineral Physics Institute, Stony Brook University, Stony Brook, New York 11794, USA
  3. Stony Brook Univ., NY (United States). Dept. of Geosciences
  4. Stony Brook Univ., NY (United States). Dept. of Geosciences, and Mineral Physics Inst.
Compressional (V_P) and shear wave (V_S) velocities of polycrystalline tungsten have been measured up to ~13 GPa at room temperature using ultrasonic interferometry in a multi-anvil apparatus. Using finite strain equation of state approaches, the elastic bulk and shear moduli and their pressure dependences are derived yielding $$K_{S0}$$= 325.9 ± 4.8 GPa, $$G_0$$ =164.1±2.5 GPa, $$K^{'}_{S0}$$ =3.65 ± 0.05 and $$G^{'}_0$$ =1.28 ± 0.02. On the basis of the current experimental data, the high-pressure behavior of Young’s modulus, Poisson’s ratio and ductility/brittleness for tungsten are also investigated. Complementary to the experimental data, the single crystal elastic constants, as well as the elastic anisotropy of tungsten are computed using density functional theory (DFT). The Voigt-Reuss-Hill average of the bulk and shear moduli calculated using the single crystal elastic constants from DFT are found comparable to the current experimental results within about 5%. Here, the present study offers a dataset for the elasticity of polycrystalline bcc tungsten to a maximum pressure more than 25-fold higher than other previous ultrasonic studies, which can further our understanding about the elastic, mechanical and electronic properties of tungsten under extreme conditions as well as thermodynamic modelling of its alloys.
Research Organization:
State Univ. of New York (SUNY), Stony Brook, NY (United States). Research Foundation of SUNY
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0002907
OSTI ID:
1529600
Alternate ID(s):
OSTI ID: 1464987
Journal Information:
Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 7 Vol. 124; ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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