期刊
JOURNAL OF APPLIED PHYSICS
卷 115, 期 11, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4868676
关键词
elasticity; iron; polymorphic transformations; wave propagation
资金
- U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]
- Laboratory directed Research and Development funding [12ERD042]
We have used a table-top scale laser to dynamically compress iron at strain rates in excess of 109 s-1 Using an embedded ultrafast interferometer, we have measured corresponding free surface histories with a time resolution of approximately 10 ps. We have analyzed the surface histories using a method that accounts for nonsteady wave propagation and time-dependent material behavior. We show that at these strain rates, the e (R) /polymorphic transition begins within 100 ps after an initial very large (similar to 10 GPa) and mostly elastic compression and appears largely complete within a similar time thereafter. The corresponding deviatoric stress before the transition begins can exceed 3 GPa, while the transition stress itself is up to 25 GPa, nearly twice the value measured at low strain rates. We use these results to propose a systematic variation with loading time of the normal-stress/relative-volume curve followed by iron during rapid compression.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据