Extreme Hardening of Pb at High Pressure and Strain Rate.
Phys Rev Lett
; 123(20): 205701, 2019 Nov 15.
Article
em En
| MEDLINE
| ID: mdl-31809064
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 â¼400 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 â¼3.8 GPa at high pressure, a â¼250-fold increase, changing Pb from soft to extremely strong.
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MEDLINE
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En
Ano de publicação:
2019
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Article