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Extreme Hardening of Pb at High Pressure and Strain Rate.
- Source :
-
Physical review letters [Phys Rev Lett] 2019 Nov 15; Vol. 123 (20), pp. 205701. - Publication Year :
- 2019
-
Abstract
- We study the high-pressure strength of Pb and Pb-4wt%Sb at the National Ignition Facility. We measure Rayleigh-Taylor growth of preformed ripples ramp compressed to ∼400 GPa peak pressure, among the highest-pressure strength measurements ever reported on any platform. We find agreement with 2D simulations using the Improved Steinberg-Guinan strength model for body-centered-cubic Pb; the Pb-4wt%Sb alloy behaves similarly within the error bars. The combination of high-rate, pressure-induced hardening and polymorphism yield an average inferred flow stress of ∼3.8 GPa at high pressure, a ∼250-fold increase, changing Pb from soft to extremely strong.
Details
- Language :
- English
- ISSN :
- 1079-7114
- Volume :
- 123
- Issue :
- 20
- Database :
- MEDLINE
- Journal :
- Physical review letters
- Publication Type :
- Academic Journal
- Accession number :
- 31809064
- Full Text :
- https://doi.org/10.1103/PhysRevLett.123.205701