Transient x-ray diffraction with simultaneous imaging under high strain-rate loading.
نویسندگان
چکیده
Real time, in situ, multiframe, diffraction, and imaging measurements on bulk samples under high and ultrahigh strain-rate loading are highly desirable for micro- and mesoscale sciences. We present an experimental demonstration of multiframe transient x-ray diffraction (TXD) along with simultaneous imaging under high strain-rate loading at the Advanced Photon Source beamline 32ID. The feasibility study utilizes high strain-rate Hopkinson bar loading on a Mg alloy. The exposure time in TXD is 2-3 μs, and the frame interval is 26.7-62.5 μs. Various dynamic deformation mechanisms are revealed by TXD, including lattice expansion or compression, crystal plasticity, grain or lattice rotation, and likely grain refinement, as well as considerable anisotropy in deformation. Dynamic strain fields are mapped via x-ray digital image correlation, and are consistent with the diffraction measurements and loading histories.
منابع مشابه
Investigation of material deformation mechanisms during high-rate loading via simultaneous X-ray diffraction and phase contrast imaging
Using polychromatic synchrotron radiation, high-rate X-ray diffraction has been performed in-situ during dynamic tensile loading. Strain rates of 1000/s and 5000/s have been achieved with a miniature tension Kolsky bar for superelastic NiTi and 1100-O series aluminum, respectively. Via altering the ICCD exposure time, single pulse and 22-pulse diffraction has been performed thus resulting in te...
متن کاملSimultaneous X-ray diffraction and phase-contrast imaging for investigating material deformation mechanisms during high-rate loading
Using a high-speed camera and an intensified charge-coupled device (ICCD), a simultaneous X-ray imaging and diffraction technique has been developed for studying dynamic material behaviors during high-rate tensile loading. A Kolsky tension bar has been used to pull samples at 1000 s(-1) and 5000 s(-1) strain-rates for super-elastic equiatomic NiTi and 1100-O series aluminium, respectively. By a...
متن کاملDynamic crystal rotation resolved by high-speed synchrotron X-ray Laue diffraction
Dynamic compression experiments are performed on single-crystal Si under split Hopkinson pressure bar loading, together with simultaneous high-speed (250-350 ns resolution) synchrotron X-ray Laue diffraction and phase-contrast imaging. A methodology is presented which determines crystal rotation parameters, i.e. instantaneous rotation axes and angles, from two unindexed Laue diffraction spots. ...
متن کاملTime-resolved x-ray diffraction techniques for bulk polycrystalline materials under dynamic loading.
We have developed two techniques for time-resolved x-ray diffraction from bulk polycrystalline materials during dynamic loading. In the first technique, we synchronize a fast detector with loading of samples at strain rates of ~10(3)-10(4) s(-1) in a compression Kolsky bar (split Hopkinson pressure bar) apparatus to obtain in situ diffraction patterns with exposures as short as 70 ns. This appr...
متن کاملSimultaneous Observation of Phase-Stepped Images for Photoelasticity Using Diffraction Gratings
Phase-stepped photoelasticity is a powerful method for full-field stress analysis, but sequential collection of the multiple required images limits the technique to static loading applications. We have developed a system that utilizes diffraction gratings to collect four phase-stepped images simultaneously with a single camera for transient loading applications. Two adjacent, perpendicularly or...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- The Review of scientific instruments
دوره 85 11 شماره
صفحات -
تاریخ انتشار 2014