Abstract
We have studied dynamic thermo-mechano-chemical responses of reactive metallic systems, both in clouds of small oxygen-free particles (≈1-10 urn in diameter) produced by fracturing Zr-rich bulk metallic glass and in pure Zr metal foils (≈25 urn thin), under thermal (laser ablation or pulse electrical heating) and mechanical loadings. The mechanical fracture/fragmentation and fragments reactions were time resolved using an integrated set of fast six-channel optical pyrometer, high-speed microphotographic camera, and time- and angle-resolved synchrotron x-ray diffraction. These small-scale tabletop real-time experiments performed on or near surfaces of reactive metals provide fundamental data, in atomistic scales or of particle clouds, regarding fragmentation mechanics, combustion mechanisms and kinetics, and dynamics of energy release under thermal and mechanical loadings. We present the results of pure Zr and Zr-rich amorphous metals, not only signifying diversified combustion mechanisms depending on microstructures, particle sizes, oxygen pressure, and ignition conditions but also providing fundamental data that can be used to develop and validate thermochemical and mechanochemical models for reactive materials.
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Acknowledgments
We appreciate Dr. Atakan Peker at Applied Science Laboratory at WSU, who provided Zr-rich bulk metallic glass used in the present study. We also recognize the contribution of Dr. Jing-Yin Chen at LLNL and Dr. Guoyin Shen at HPCAT/APS in time-resolved x-ray diffraction experiments. The x-ray work was done using the microdiffraction beamline (16IDD) at the High Pressure Collaborating Access Team (HPCAT) of the APS. Use of the HPCAT facility was supported by DOE-BES, DOE-NNSA (CDAC, LLNL, UNLV), NSF, DOD-TACOM, and the W.M. Keck Foundation. The present study has been supported by the DARPA (Grant No. W911NF-09-C-0033), U.S. DHS under Award Nos. 2008-ST-061-ED0001, DTRA (Grant No. HDTRA 1-09-1-0041), and NSF-DMR (Grant No. 0854618). The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Department of Homeland Security.
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Wei, H., Yoo, CS. Dynamic responses of reactive metallic structures under thermal and mechanical ignitions. Journal of Materials Research 27, 2705–2717 (2012). https://doi.org/10.1557/jmr.2012.302
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DOI: https://doi.org/10.1557/jmr.2012.302