Yielding of tantalum at strain rates up to 109 s–1
Journal Article
·
· Applied Physics Letters
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Here, we have used a 45 μJ laser pulse to accelerate the free surface of fine-grained tantalum films up to peak velocities of ~1.2 km s–1. The films had thicknesses of ~1–2 μm and in-plane grain widths of ~75–150 nm. Using ultrafast interferometry, we have measured the time history of the velocity of the surface at different spatial positions across the accelerated region. The initial part of the histories (assumed to correspond to the “elastic precursor” observed previously) exhibited measured strain rates of ~0.6 to ~3.2 × 109 s–1 and stresses of ~4 to ~22 GPa.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC52-07NA27344
- OSTI ID:
- 1438742
- Report Number(s):
- LLNL-JRNL--690544
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 9 Vol. 109; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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