Multi-phase equation of state of ultrapure hafnium to 120 GPa
Journal Article
·
· Journal of Physics. Condensed Matter
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Argonne National Lab. (ANL), Lemont, IL (United States); Carnegie Inst. of Science, Argonne, IL (United States). High Pressure Collaborative Access Team (HPCAT)
Hafnium (Hf) is an industrially important material due to its large neutron absorption cross-section and its high corrosion resistance. When subjected to high pressure, Hf phase transforms from its hexagonal close packed α-Hf phase to the hexagonal ω-Hf phase. Upon further compression, ω-Hf phase transforms to the body centered cubic β-Hf phase. In this study, the high pressure phase transformations of Hf are studied by compressing and decompressing a well-characterized Hf sample in diamond anvil cells up to 120 GPa while collecting x-ray diffraction data. The phase transformations of Hf were compared in both a He pressure transmitting medium (PTM) and no PTM over several experiments. It was found that the α-Hf to ω-Hf phase transition occurs at a higher pressure during compression and lower pressure during decompression with a helium (He) PTM compared to using no PTM. Finally, there was little difference in the ω-Hf to β-Hf phase transition pressure between the He PTM and no PTM. The equation of state was fit for all three phases of Hf and under both PTM and no-PTM.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- LDRD; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA). Office of Experimental Sciences
- Grant/Contract Number:
- 89233218CNA000001; AC02-06CH11357
- OSTI ID:
- 1839690
- Alternate ID(s):
- OSTI ID: 1853928
- Report Number(s):
- LA-UR-21-24396; 170237
- Journal Information:
- Journal of Physics. Condensed Matter, Journal Name: Journal of Physics. Condensed Matter Journal Issue: 5 Vol. 34; ISSN 0953-8984
- Publisher:
- IOP PublishingCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Similar Records
The phase diagram of Ti-6Al-4V at high-pressures and high-temperatures
Reinvestigation of high pressure polymorphism in hafnium metal
Journal Article
·
Wed Feb 17 19:00:00 EST 2021
· Journal of Physics. Condensed Matter
·
OSTI ID:1781304
Reinvestigation of high pressure polymorphism in hafnium metal
Journal Article
·
Sat Jun 21 00:00:00 EDT 2014
· Journal of Applied Physics
·
OSTI ID:22303993