Abstract
The dynamic compressive behavior of TiZrNbV BCC-structured refractory high-entropy alloys (RHEAs) was studied in this work. A remarkable phenomenon of flow stress re-rising was observed from the dynamic compressive stress-strain curve obtained from split Hopkinson pressure bar test. Microstructure characterization including X-ray diffraction, scanning electron microscope, electron back scattering diffraction and macroscopical electric resistivity measurement jointly reveal that a "crack healing" phenomenon does exist in TiZrNbV RHEA during dynamic compression, and then leads to the recovery of flow stress. It is believed that explosive welding dynamic compression results in the "crack healing" phenomenon and then affect the dynamic mechanical behavior of TiZrNbV RHEA based on comparative experiment of alloys with different plasticity. The finding for the crack healing phenomenon is helpful to understand the essence about the dynamic compressive behavior of BCC-structured RHEAs.
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