Dynamic responses of reactive metallic structures under thermal and mechanical ignitions

作者：Wei Haoyan; Yoo Choong Shik^*

来源：Journal of Materials Research, 2012, 27(21): 2705-2717.

DOI：10.1557/jmr.2012.302

We have studied dynamic thermo-mechano-chemical responses of reactive metallic systems, both in clouds of small oxygen-free particles (similar to 1-10 mu m in diameter) produced by fracturing Zr-rich bulk metallic glass and in pure Zr metal foils (similar to 25 mu m 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.

• 出版日期2012-11