Abstract
By combining the distinctive advantage of the pulsed laser with a high strain rate, this study conducts dynamic compaction experiments with high-strain rate laser shock and quasi-static compaction with a low strain rate on aluminum-based composite powder (Wp/Al) and analyzes the effects of pressing pressure and Wp content on the relative density, surface microstructure, demolding pressure, radial rebound, and mechanical properties of Al-based composite (Wp/Al) compacts under the two modes of action. The shock wave propagation process, densification process, and adiabatic temperature rise in the pressed billet at high strain rates due to laser shock are analyzed in combination with 2D MPFEM. Results show that the relative density of the billets decreases as the Wp particle content increases and that the relative density of the billets obtained with high-strain rate laser shock dynamic compaction is 97.62%, which is up to 2.9% higher than that of quasi-static compaction with low strain rate, the demolding pressure decreases by up to 1.56 times, and the hardness increases by up to 13.5%. The hard particles Wp are evenly distributed on the surface of the billet, and no significant aggregation of hard particles is observed. The 2D MPFEM reveals that the speed between particles within the powder at the beginning of the pressing reaches the minimum collision speed of welding, which is beneficial to the particles to achieve improved adhesion; laser high-speed impact under the particles due to inertial effects produces severe plastic deformation, which in turn improves the formability of the powder; in the process of laser shock the temperature at the edge of the particles is greater than the temperature inside the particles, and the temperature near the upper impactor is higher. In addition, the results of the simulation study are compared with the experiments and are found to be remarkably consistent.
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The work reported in this paper was supported by the National Natural Science Foundation of China (No. 51675243 and No. 52075226).
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TW: investigation, writing—original draft preparation; MC: validation, methodology; ZZ: conceptualization; HL: writing—review and editing, supervision; YM: formal analysis; WS: resources; XW: validation.
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Wang, T., Cui, M., Zhang, Z. et al. Comparison of laser shock dynamic compaction with quasi-static compaction. Int J Adv Manuf Technol 130, 1355–1371 (2024). https://doi.org/10.1007/s00170-023-12744-9
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DOI: https://doi.org/10.1007/s00170-023-12744-9