Direct observation of deformation and resistance to damage accumulation during shock loading of stabilized nanocrystalline Cu-Ta alloys

B. C. Hornbuckle (), R. K. Koju, G. Kennedy, P. Jannotti, N. Lorenzo, J. T. Lloyd, A. Giri, K. Solanki, N. N. Thadhani, Y. Mishin and K. A. Darling
Additional contact information
B. C. Hornbuckle: DEVCOM Army Research Laboratory
R. K. Koju: MSN 3F3
G. Kennedy: 771 Ferst Dr. NW
P. Jannotti: DEVCOM Army Research Laboratory
N. Lorenzo: DEVCOM Army Research Laboratory
J. T. Lloyd: DEVCOM Army Research Laboratory
A. Giri: DEVCOM Army Research Laboratory
K. Solanki: Arizona State University
N. N. Thadhani: 771 Ferst Dr. NW
Y. Mishin: MSN 3F3
K. A. Darling: DEVCOM Army Research Laboratory

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Energy absorption by matter is fundamental to natural and man-made processes. However, despite this ubiquity, developing materials capable of withstanding severe energy fluxes without degradation is a significant challenge in materials science and engineering. Despite recent advances in creating alloys resistant to energy fluxes, mitigating the damage caused by the absorption and transfer of mechanical energy remains a critical obstacle in both fundamental science and technological applications. This challenge is especially prominent when the mechanical energy is transferred to the material by shock loading. This study demonstrates a phenomenon in which microstructurally stabilized nanocrystalline Cu-Ta alloys can undergo reversal or nearly complete recovery of the dislocation structure after multiple shock-loading impacts, unlike any other known metallic material. The microstructure of these alloys can withstand repeated shock-wave interactions at pressures up to 12 GPa without any significant microstructural damage or deterioration, demonstrating an extraordinary capacity to be virtually immune to the detrimental effects of shock loading.

Date: 2024
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DOI: 10.1038/s41467-024-53142-3

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