Abstract
Tantalum (Ta) is a metal that has useful properties that make it useful in extreme environments. It is, therefore, important to understand how Ta performs in such extreme conditions by accurately measuring its properties. In this work, the yield strength of tantalum has been measured at pressures up to 276 GPa using axial and radial x-ray diffraction (XRD) methods in diamond anvil cells (DACs). We measured strength using XRD in a radial DAC to 50 GPa, in an axial DAC to 60 GPa using diamonds with standard flat culets, and in a final experiment to 276 GPa using toroidal diamond anvils. The radial XRD data were refined using the Material Analysis Using Diffraction Rietveld software package to extract lattice strain and the yield strength. The axial data were refined using the General Structure Analysis System II and a linewidth method was used to calculate the yield strength. The yield strength measured near ambient pressure was found to be 0.5 GPa and increased with a pressure of up to 50 GPa, where the yield strength plateaued at a value of 2.4 GPa. At pressures above 60 GPa, the strength increased again to a maximum value of 9 GPa at the highest pressure of 276 GPa. The data from the three experiments show good agreement between the methods and previously reported experimental data. This agreement illustrates the value of axial diffraction data for material strength determination and allows for measurements at multi-hundreds of GPa using toroidal DACs.
| Original language | English |
|---|---|
| Article number | 015905 |
| Journal | Journal of Applied Physics |
| Volume | 131 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 7 2022 |
| Externally published | Yes |
Funding
The research presented in this article was supported by the Laboratory Directed Research and Development program of Los Alamos National Laboratory (LANL), the G. T. Seaborg Institute under Laboratory Directed Research and Development (LDRD) (Project No. 20210527CR), and the LANL Office of Experimental Sciences, Dynamic Materials Properties Program. LANL is operated by Triad National Security, LLC for the DOE-NNSA under Contract No. 89233218CNA000001. Portions of this work were performed at HPCAT (Sector 16), Advanced Photon Source (APS), Argonne National Laboratory. HPCAT operations are supported by DOE-NNSA’s Office of Experimental Sciences. The Advanced Photon Source is a U.S. Department of Energy (DOE) Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. Portions of this work were performed under the auspices of the U.S. Department of Energy by the Lawrence Livermore National Laboratory under Contract No. DE-AC52-07NA27344. We would like to acknowledge support from the U.S. National Science Foundation (NSF) under Metals and Metallic Nanostructures program (Grant No. DMR-1904164). We thank Saryu Fensin and George T. (Rusty) Gray III for their help with chemical characterization of the Ta sample used in the radial diffraction experiment. L.M. acknowledges support from US Department of Energy National Nuclear Security Administration through the Chicago-DOE Alliance Center (DE-NA0003975).
| Funders | Funder number |
|---|---|
| Chicago-DOE Alliance Center | DE-NA0003975 |
| DOE-NNSA | 89233218CNA000001 |
| DOE-NNSA’s Office of Experimental Sciences | |
| G. T. Seaborg Institute | 20210527CR |
| National Science Foundation | DMR-1904164 |
| U.S. Department of Energy | |
| Office of Science | |
| National Nuclear Security Administration | |
| Argonne National Laboratory | DE-AC02-06CH11357 |
| Lawrence Livermore National Laboratory | DE-AC52-07NA27344 |
| Laboratory Directed Research and Development | |
| Los Alamos National Laboratory |