Extreme Hardening of Pb at High Pressure and Strain Rate.
Extreme Hardening of Pb at High Pressure and Strain Rate.
复制标题
DOI：
10.1103/physrevlett.123.205701
复制
发表时间：
2019-11
影响因子：
8.6
通讯作者：
A. Krygier;P. Powell;J. McNaney;C. Huntington;S. Prisbrey;B. Remington;R. Rudd;D. Swift;C. Wehrenberg;A. Arsenlis;H. Park;P. Graham;E. Gumbrell;M. Hill;A. Comley;S. Rothman
中科院分区：
文献类型：
--
作者：
A. Krygier;P. Powell;J. McNaney;C. Huntington;S. Prisbrey;B. Remington;R. Rudd;D. Swift;C. Wehrenberg;A. Arsenlis;H. Park;P. Graham;E. Gumbrell;M. Hill;A. Comley;S. Rothman
在国家点火装置上研究了Pb和Pb-4wt%Sb的高压强度。我们测量的瑞利-泰勒增长的预成型波纹斜坡压缩到400 GPa的峰值压力，其中最高的压力强度测量有史以来在任何平台上报告。我们发现与使用体心立方Pb的改进的Steinberg-Guinan强度模型的2D模拟一致; Pb-4wt%Sb合金在误差条内表现类似。高速率，压力诱导硬化和多态性的组合产生的平均推断的流动应力为3.8GPa在高压下，250倍的增加，改变铅从软到极强。
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.